*
 

iForest - Biogeosciences and Forestry

iForest - Biogeosciences and Forestry
*

Fuel characterization and crown fuel load prediction in non-treated Calabrian pine (Pinus brutia Ten.) plantation areas

iForest - Biogeosciences and Forestry, Volume 15, Issue 6, Pages 458-464 (2022)
doi: https://doi.org/10.3832/ifor4048-015
Published: Nov 03, 2022 - Copyright © 2022 SISEF

Research Articles

Successful management of young, fire-prone Calabrian pine forests requires an accurate characterization of surface and canopy fuel loads at stand level. This study characterizes the surface and canopy fuel characteristics in unthinned Calabrian pine plantations in Turkey. Fifteen sample plots were measured to determine the surface and crown fuel characteristics of very young, young and middle aged Calabrian pine stands (10 to 28 years old). Thirty-six trees were destructively sampled to quantify the crown fuel loads and canopy fuel characteristics of the stands. Surface fuel load ranged from 11.38 t ha-1 in the young stands to 35.27 t ha-1 in the middle aged stands. Dead fuel load as ladder fuels on the trees ranged from 0.77 kg in very young stands to 13.56 kg in the young stands. Live fuel loads on the trees ranged from 0.77 kg to 23.29 kg in the young aged stands. Total active crown fuel load was 58.7%, 52.1% and 49.5% of total crown fuel load in very young, young and middle aged stands, respectively. Our results improve the current crown fuel model predictions and showed the importance of dead fuel load in fire management studies both for the determination of crown fuel loads and the calculation of carbon stocks.

Surface Fuel, Dead Crown Fuel, Live Crown Fuel, Non-treated, Pinus brutia, Türkiye

  Introduction 

Wildfires are the main threat in Calabrian pine forests, which cover nearly 5.2 million ha of forest lands in Turkey ([27]). The ability to control forest fires with a successful prediction of fire behavior is mostly associated with the characteristics of fuel load ([8]). In this sense, conifer plantations have a particular importance for fire managers and researchers as they are generally associated with extreme fire behavior ([23]) and intense crown fires ([48], [2]). In the early years of the establishment on a suitable site, conifer plantations produce plenty of dead flammable materials mainly due to the lack of light after the onset of crown closure ([25]). Dead needles suspended on the dead fine twigs under living tree crown serve as ladder fuels from surface fuels to live crown fuels ([19], [38]). In particular, the amount of canopy fuels coupled with extra shrub in the understory and other kinds of ladder fuels is highly decisive in the onset and spreading of crown fires ([21]). For managing and understanding crown fires, investigations on comprehensive crown fuel load and canopy fuel characteristics have crucial importance ([1]). Surface and ladder fuels and their properties are determinant on the initiation of crown fires ([17], [49]). After the transmission of surface fire up to tree crowns, canopy fuels and their characteristics ([19]) become the driving factors for the spread and continuity of crown fires ([20]). In this sense, the canopy base height (CBH) and the canopy bulk density (CBD) are the two key parameters for the determination and explanation of canopy fuel characteristics ([19]).

Information on characteristics and the vertical distribution of crown fuels is essential in fire behavior and fuel management studies. Some investigations have already been carried out to determine crown fuels or biomass for coniferous natural forest ([45], [46]) and plantations ([25], [42], [32], [5]). However, dead fuels or ladder fuels on trees have been rarely investigated ([39], [43], [50]) especially in planted and non-treated (unthinned) conifer stands ([51], [18]). Other studies assessed the amount and properties of crown fuels of the broadest fuel types composed of Calabrian pine ([36], [35], [9], [29], [5], [4]) and Anatolian Black pine (Pinus nigra J.F. Arnold - [33], [35]) in Turkey. However, none of these studies dealt with the amount and characteristics of the ladder fuels on trees, especially in non-treated plantation forests. Furthermore, the vertical configuration of crown fuel load in non-treated Calabrian pine stands at tree level and the determination of canopy fuel characteristics at stand level have not been investigated.

The close relationship of Calabrian pine with fire ecology ([40], [47]) and fire behavior ([11]) necessitates of extensive research to be carried out. Fires in the young and middle-aged Calabrian pine forests spread generally in the form of very severe surface fires and often crown fires ([12]), especially in plantation areas ([10]). Therefore, the characterisation of fuel from tree to stand level ([31], [19]) in Calabrian pine forested areas ([6]) are important for fire prevention and fire fighting activities ([33]).

The objectives of this study are to: (i) investigate the dead and live fuel loads on tree canopies and assess surface, ladder and canopy fuel properties; and (ii) develop models of ladder and crown fuel loads in non-treated Calabrian pine plantations. The results of this study will be useful in fire and fuel management studies in fire-prone forested areas.

  Materials and methods 

Study site

The study area is the Hacimahmut Forest Planning Unit (40° 22′ 17″ N, 40° 30′ 24″ E), located in Nortwestern Turkey and managed by the Göynük State Forest Enterprise of the Bolu Regional Forestry Directorate (Fig. 1). The Hacimahmut Forest Planning Unit area is 20.949.9 ha, of which 71% is covered by forests (79.4% productive, 20.6% unproductive). Planted stands cover nearly 6% of total forests in the study area. Forests are mainly composed of Anatolian Black pine (43.9%), Calabrian pine (25.8), mixed conifers (15.1%), conifer-broadleaved mixed forests (5.6%), beech (7.5) and other tree species (2.1% - [26]). Elevation ranges from 570 to 730 m a.s.l.

Fig. 1 - Location of the case study area in the Bolu Regional Directorate of Forestry, NW Turkey.

  Enlarge/Shrink   Download   Full Width  Open in Viewer

The study area is located in the transition zone between the Black Sea climate and the Central Anatolian climate. According to the meteorological data over the period 1991-2020, rainfall mostly occurs in the spring and winter months, with an average annual precipitation of 573.6 mm. The lowest precipitation occurs in September with an average 26.5 mm and the highest in June with an average 68.9 mm. In the summer season, the temperature is quite high with summer drought periods. The lowest average temperature is recorded in January with -2.4 °C and the highest in June with 28.7 °C. According to the last 93-year meteorological data, the lowest temperature occurred in January with -31.5 °C and the highest in August with 39.8 °C ([28]).

Selection of the sample plots

The sample plots were selected from the compartments no. 161, 162, 181 and 183 in the Hacimahmut Forest Planning Unit. Field measurements were carried out during the summer and autumn seasons of 2018. In order to assess the stand characteristics and determine the amounts of fuel load, 15 sample plots were randomly selected according to their development stage and crown closure in pure non-treated (unthinned) Calabrian pine plantations (Fig. 2). Each sample plot was 200 m2 and the shape was circular with a radius of 8 m.

Fig. 2 - General view of very young (left) young (middle) and middle aged (right) stands.

  Enlarge/Shrink   Download   Full Width  Open in Viewer

Stands measurements

Several observations and measurements were carried out to determine the surface and aerial fuel properties in the sample plots. General descriptive information of the sample plots, including altitude, slope, aspect, crown closure and stand types were recorded. The spatial location of all sample plots, their altitude and aspect were measured with a global positioning system device. Pictures and video of the sample plots were taken in all directions within the sample plots for further evaluation. To characterise the main attributes of trees in the sample plots, diameter at breast height (DBH, cm), tree height (H, m), tree age (A, yrs), live crown base height (CBH, m), crown length (CL, m), crown width (CW, m) and bark thickness (BT, cm) in two perpendicular directions were measured. DBH was measured to the nearest 0.1 cm with a tree caliper in two direction. Tree height (H) was measured using a steel tape for short trees and an electronic height measurement device for tall trees. Crown width (CW) was measured as an average value according to the length of the widest living branch measurement in two orthogonal directions. Crown length (CL) was measured as a value calculated from the difference between tree height and CBH. The social status of each tree in the sample plots was assessed according to the classification system of Kraft ([37]).

A total of 607 trees was measured in the 15 sample plots. Forty-eight trees were measured but discarded from average calculation because of undesired characteristics (e.g., unhealthy or dead condition). The age (taken at 1.30 m above the ground) and bark thickness (measured at 0.30 cm above the forest floor) were also measured in a subset of 137 sampled trees.

Surface fuel measurements

Information on the litter and duff fuel materials is key in fire behavior studies and fire management plans ([34], [30]). For the determination of the surface fuel load and its characteristics, three subplots (30 × 30 cm in size) were established in each very young, young and middle aged sample stand, totaling 15 subplots. Each subplot was positioned to reflect the general surface fuel condition of the parent sample plot. Later, litter samples were carefully cut with hand pruning shears to the duff layer, collected and placed in plastic bags. Also, litter depth at each subplot was measured with a ruler at six different locations from the surface of duff layer to the upper part of litter layer. The surface fuel bed depth was calculated as the average depth at these six points. Duff samples were collected to the mineral soil and placed in a plastic bag labelled with plot and subplot numbers and the litter and duff samples were transported to the laboratory.

Ladder and crown fuel measurements

Overall, 36 trees were selected and felled from the 15 sample plots to assess the ladder and crown fuel load on trees. The selection was based on the average, minimum and maximum attributes of the measured trees to best reflect the characteristics of the parent sample plot. Trees heavily defoliated or with broken tops were not considered ([15]). Each felled tree was divided into 1-meter sections starting from 0.30 cm above the ground. All dead or live fuel materials in each 1-m section were carefully cut, collected and weighted ([3]) with no subsampling. Dead and live needles on the branches were carefully removed, separated and weighed in the field. Moreover, all dead and live branches in each section were classified according to their sizes and weighed in the field.

Laboratory analyses

Litter and duff samples were transpoted to the lab and analyzed. The dead litter, bark flakes, cones and branches were classified in the litter samples. According to the classification of branches reported by Stocks ([45]), very thin (BVF, 0.0-0.3 cm), thin (BF, 0.3-0.6 cm), medium (BM, 0.6-1.0 cm), thick (BTH, 1.0-2.5 cm) and very thick (BVT, >2.5 cm) branches were separated with a special steel ruler and prepared with a 0.05 mm sensitivity scale by a laser cutting device. Duff samples were accurately examined to avoid the presence of rock, stones or pebbles. Live crown fuel components of samples were preliminary dried at room temperature in the laboratory and then placed in an oven at 105 °C for 24 hours. Oven-dried fuel weight was measured using a 0.01 g sensitivity scale ([9]).

Statistical analysis

All statistical analyses were performed using the package SPSS Statistics® v. 21.0 (IBM, Armonk, NY, USA). Minimum, maximum and average values of tree measurements and stand properties were calculated. Correlation and regression analysis were carried out to determine the relationship between tree properties and crown fuel components. Data were tested for normality before correlation and regression analyses, and the relationships between independent and dependent variables were checked for linearity. A parametric linear regression based on the stepwise procedure was used to model crown fuel estimates. RCD (Root Collar Diameter), DBH, H, CBH, CW, CL were considered as predictors (independent variables). Needles (N), branches (BVF, BF, BM, BTH, BVT), dead and live active fuel (N+BVF+BF) and total crown fuels (all needles and branches) were considered as dependent variables.

  Results and discussion 

Stand characteristics

The stand age varied between 10 to 28 years, tree height from 2.7 to 16.6 m, tree diameter at breast height from 5.0 to 25.6 cm, crown base height between 0.7 and 9.5 m and crown closure from 70% to 95% (Tab. S1 in Supplementary material).

Any changes in the stands have an impact on fuel characteristics and thus on fire behavior ([8]). It is well known that the silvicultural practices (e.g., thinning) have an effect on the stand characteristics by re-locating the fuel position ([7]). As Calabrian pine is a shade intolerant species ([14]), silvicultural treatments play an important role in tree development and the regulation of fuel in Calabrian pine stands. In this context, this study provides new evidences on the fuel characteristics of non-treated, planted Calabrian pine stands in Turkey.

According to the social status (i.e., the competitive status) of the measured trees based on the Kraft’s classes (Fig. 3), about 80% of trees (276 dominants and 212 codominants) reach the upper canopy, while the remaining trees were suppressed (71) or unhealthy/dead trees (48). Such proportions support the evidence that thinning operations have not been carried out to date in the studied stands. The high share (35%) of codominant trees in the upper canopy and the high rate (20%) of suppressed trees resulted in a poor stand growth ([41]). Overall, 55% of trees could be actually removed by silvicultural interventions, especially thinning from below.

Fig. 3 - General tree status in three different stages of stand development.

  Enlarge/Shrink   Download   Full Width  Open in Viewer

Surface fuel loads (litter and duff)

The amount and characteristics of surface fuel were characterized by classifying the fuel materials of subplots in the sample stands (Tab. S2 in Supplementary material). The total surface fuel load ranged from 11.38 t ha-1 in young stands to 35.27 t ha-1 in middle aged stands. Forest floor depth ranged from 1.7 cm in very young stands to 5.1 cm in middle aged stands. According to a similar study conducted in the southern part of the same Calabrian pine forest, Cepel & Tekerek ([22]) found surface fuel load between 7.2 to 43.4 t ha-1. Further, for the same tree species, Baysal et al. ([6]) found surface fuel load between 0.3 to 34.3 t ha-1. In both the above studies, the largest amount of surface fuel load was recorded in the middle aged stands, close to the upper level of surface fuel load. Comparing our results to other conifer species, Williams ([51]) reported an average surface fuel load of 22.7 t ha-1 in a 12-year-old unthinned plantation of Pinus radiata, while Burrows et al. ([16]) reported an average litter fuel load of about 10.5 t ha-1 in a 17-year-old unthinned maritime pine plantation, and Botelho et al. ([13]) assessed the litter fuel loads ranging from 1.2 to 6.3 t ha-1 in 10-18-year-old stands of the same species.

Crown fuels

Thirty-six trees were felled for destructive sampling (Tab. S3 in supplementary material). The DBH of the felled trees ranged from 5.0 to 19.6 cm with an average of 11.3 cm, while their height ranged from 3.9 to 12.6 m, with an average of 8.2 m. According to the crown fuel load of the sampled trees for three different stand types (Tab. S4 in supplementary material), the lowest live crown fuel load was recorded in trees from very young stands (average: 4.59 kg), while the highest live crown fuel load was found in trees from the young stands (average: 13.89 kg). Similarly, the lowest dead crown fuel load was observed in the very young stands (average: 1.63 kg) and the highest in the young stands (average: 4.13 kg). Total dead and live crown fuel load of trees was found the lowest in very young stands, with 6.22 kg on average, while the highest was found in young stands with an average 18.02 kg. For middle aged stands, crown fuel load was about 34.5% less than in young stands. This result could be due to the higher basal area and crown closure of middle aged stands compared to young stands.

The percentage of dead, live, and dead and live crown fuel components for each stand was obtained by taking all dead crown fuels and live crown fuels on the felled trees (Fig. 4). When dead and live crown fuel load on trees were compared to the total crown fuel load in each stand type, live crown fuel percentages gradually decreased from very young to middle aged stands. In contrast, dead crown fuel load percentage gradually increased from very young to middle aged stands. Live fuel percentage was found to be the highest in the very young stand, based on the comparison of dead, live or dead and live active fuel on the tree to the total crown fuel load (dead and live crown fuels with stem and bark without cones). Also, the lowest active dead fuel load was found in the young stands, and the highest was found in the middle aged stands, with very similar percentage in the very young stands. Active live fuel is gradually decreasing from the very young stands to the middle aged stands (Fig. 4).

Fig. 4 - Active dead and live crown fuel percentage distributions of three different calabrian pine plantation stands.

  Enlarge/Shrink   Download   Full Width  Open in Viewer

The vertical distribution of dead and live crown fuel percentage for each 1-m sectional height from the ground to the tree top is displayed in Fig. 5.

Fig. 5 - Vertical distribution of live and dead crown fuel load in very young (upper panel), young (middel panel) and middle aged (lower panel) Calabrian pine stands.

  Enlarge/Shrink   Download   Full Width  Open in Viewer

Crown fuel load models

No significant correlation was found between the live needles and live branches and CBH. However, CBH and dead crown fuel components were positively correlated (p<0.01), except for the dead very thick branches. Live and crown fuel loads on the trees were closely related to DBH, H and CW (p<0.01), but not CBH. In addition, the total amount of live and dead fuel loads of the felled trees were also found closely related to DBH, H, CW and CL (p<0.01). As for CBH, no significant correlation was found between the total amount of live and total amount of dead fuel loads on the selected trees.

Dead, live, and total dead and live fuel loads on trees were modeled by linear regression analysis (Tab. 1) taking tree characteristics as predictors (independent variables) of the fuel loads (dependent variables). The results of regression analysis showed that DBH was the main ([24], [44], [4]) and strongest predictors ([1]) of live and total crown fuel loads (Tab. 1).

Tab. 1 - Regression models using tree characteristics (DBH, H, Age, CBH, BT) as predictors of the different types of fuel loads observed on the selected trees.

Fuel
type
Model
no
Model Constant
a
Coefficient
b
Coefficient
c
Adjusted
R2
SEE
Live crown fuel 1a ln needle= a+b×(ln DBH) -3.534 1.812 - 0.840 0.323
1b ln needle= a+b×(ln DBH)+c×(ln AGE) -1.693 2.249 -0.936 0.912 0.239
1c ln branches= a+b×(ln DBH) -3.728 2.216 - 0.873 0.345
1d ln branches= a+b×(ln DBH)+c×(ln CBH) -3.850 2.540 -0.595 0.949 0.220
1e ln active= a+b×(ln DBH) -2.919 1.794 - 0.856 0.300
1f ln active= a+b×(ln DBH)+c×(ln CBH) -3.023 2.069 -0.506 0.937 0.198
1g ln crownfuel= a+b×(ln DBH) -3.012 2.079 - 0.874 0.323
1h ln crownfuel= a+b×(ln DBH)+c×(ln CBH) -3.126 2.379 -0.553 0.947 0.208
Dead crown fuel 2a ln needle= a+b×(ln AGE) -11.938 3.007 - 0.602 0.722
2b ln needle= a+b×(ln AGE)+c×(ln BT) -12.234 3.699 -1.718 0.704 0.623
2c ln branches= a+b×(ln H) -2.107 1.491 - 0.654 0.386
2d ln branches= a+b×(ln H)+c×(ln BT) -2.214 1.083 0.883 0.726 0.344
2e ln active= a+b×(ln H) -2.274 1.227 - 0.602 0.355
2f ln active= a+b×(ln H)+c×(ln BT) -2.365 0.882 0.745 0.669 0.323
2g ln crownfuel= a+b×(ln H) -2.170 1.542 - 0.685 0.373
2h ln crownfuel= a+b×(ln H)+c×(ln BT) -2.265 1.178 0.788 0.739 0.339
All crown fuel 3a ln needle= a+b×(ln DBH) -3.449 1.802 - 0.882 0.270
3b ln needle= a+b×(ln DBH)+c×(ln DBH) -3.520 1.991 -0.347 0.919 0.233
3c ln branches= a+b×(ln DBH) -2.379 1.855 - 0.946 0.181
3d ln branches= a+b×(ln DBH)+c×(ln CBH) -2.420 1.963 -0.199 0.958 0.159
3e ln active= a+b×(ln DBH) -2.078 1.573 - 0.906 0.207
3f ln active= a+b×(ln DBH)+c×(ln AGE) -1.111 1.803 -0.491 0.934 0.174
3g ln crownfuel= a+b×(ln DBH) -2.073 1.839 - 0.943 0.185
3h ln crownfuel= a+b×(ln DBH)+c×(ln CBH) -2.121 1.964 -0.230 0.960 0.155

  Enlarge/Reduce  Open in Viewer

Crown fuel load data obtained from the sampled trees were then used to predict the stand canopy characteristics ([19]) in terms of crown base height (CBH), crown fuel load (CFL), and canopy bulk density (CBD). Models 3b and 3e developed in this study (Tab. 1) were used to obtain the CBH, CFL and CBD estimates at the stand level for trees with DBH between 5-20 cm, while for trees with DBH>20 cm we applied the models 4j and 4k (see Tab. S5 in Supplementary material) developed by Güngöroglu et al. ([29]). The stand level characteristics of the canopy for the three different stand types are given in Tab. 2.

Tab. 2 - Descriptive statistics of the sampled trees for the determination of crown fuel load. CFLLN and CBDLN obtained from live needles. CFLAF and CBDAF obtained from live active fuels. (SD): standard deviation.

Stand types Very young Young Middle aged
Min Max Mean SD Min Max Mean SD Min Max Mean SD
CBH (m) 1.33 3.25 2.09 0.73 2.58 3.42 3.10 0.34 3.09 7.17 5.90 1.67
CFLLN (kg m-2) 0.193 0.498 0.335 0.117 0.469 0.604 0.522 0.060 0.546 0.854 0.720 0.137
CBDLN (kg m-3) 0.046 0.120 0.087 0.028 0.086 0.110 0.099 0.010 0.086 0.154 0.128 0.027
CFLAF (kg m-2) 0.343 0.883 0.595 0.208 0.083 1.064 0.921 0.104 0.959 1.501 1.265 0.240
CBDAF (kg m-3) 0.083 0.213 0.155 0.049 0.152 0.194 0.176 0.017 0.151 0.271 0.230 0.048

  Enlarge/Reduce  Open in Viewer

The lowest canopy fuel load (CFL) was predicted in the very young stands and the highest in middle aged stands, with an average of 0.72 kg m-2 for needles only and 1.265 kg m-2 for the active fuel (N, BVF and BF). Canopy bulk densities (CBD) ranged from 0.046 kg m-3 in very young stands to 0.230 kg m-3 in middle aged stands. Küçük & Bilgili ([36]) reported an average CFL of 1.51 kg m-2 and a mean CBD of 0.212 kg m-3 for Calabrian pine stands in Turkey. Ruiz-González & Alvarez-González ([43]) found a mean CBD value of 0.21 kg m-3 in radiata pine plantations. Both the above findings are fully consistent with the mean CBD value observed in middle-aged stands in this study (0.23 kg m-3). Nonetheless, the mean CBD we recorded in the very young and young stands was lower than that reported in other studies ([33], [36], [43]).

Moreover, Küçük et al. ([33]) reported average values of 2.20 kg m-2 and 0.148 kg m-3 for CFL and CBD, respectively, in a 13-year old Anatolian black pine plantation in the Northwestern Turkey.

In most of the carbon determination studies, dead fuel on trees was generally not taken into consideration. The result of this study highlight the importance of including the dead fuel load in investigations aimed to forest carbon assessment.

  Conclusion 

The changes of dead and living fuel in 10- to 28-year-old non-treated Calabrian pine plantations in Turkey were investigated. Dead fuel load in very young, young and middle aged stands was approximately 26.2%, 22.9% and 32.1% of the total crown fuel load, respectively.

Fuel loads were assessed from the mineral soil to the upper canopy for stands at three different stage of development. Our results may contribute to classify and mapping fuels with new technological methods, to enhance the fuel model predictions in Calabrian pine plantations in Turkey, and to determine post-fire fuel consumption.

  List of abbreviations 

The following abbreviations have been used throughout the paper: (A): Tree age; (AF): Active fuel; (BF): Thin branches; (BM): Medium branches; (BT): Bark thickness; (BTH): Thick branches; (BVF): Very thin branches; (BVT): Very thick branches; (CBD): Canopy bulk density; (CBH): Crown base height; (CFL): Crown fuel load; (CL): Crown length; (CW): Crown width; (DBH): Diameter at breast height; (GDF): General Directorate of Forestry; (H): Tree height; (N): Needle; (RCD): Root collar diameter; (TCFL): Total crown fuel load; (TDCFL): Total dead crown fuel load; (TLCFL): Total live crown fuel load.

  Acknowledgements 

This study was supported by the Düzce University, research project no. 2018.02.02. 789. The authors acknowledge the assistance of the Turkish General Directorate of Forestry for their valuable benefits. Also, the authors greatly acknowledge the field assistance of 2018 Community Benefit Programs workers, Filiz Demirtas, Gönül Zimsir, Aysel Çakmak, Zengül Dag, Rabia Alkan, Sadiye Arma, Ibrahim Çetin and Mükaddes Ünal.. Special thanks to Nuray Öztürk for her helping in the field work and laboratory analyses.

  Author contributions 

MY: field measurements, sample collection, lab analysis, data entry, statistical analysis, helped in writing the manuscript draft; IB: conceived the study and methodology, helped in field measurements, lab analyses, data processing, validation and statistical analysis, supervision, editing and revision of the manuscript; ÖK: conceived the study and methodology, statistical analysis, supervision, editing and revision of the manuscript.

  References

(1)
Affleck DLR, Keyes CR, Goodburn JM (2012). Conifer crown fuel modeling: current limits and potential for improvement. Western Journal of Applied Forestry 27: 165-169.
CrossRef | Gscholar
(2)
Alexander ME (1992). Fire behavior in exotic pine plantations of Australasia. Australian Forest Growers 15 (1): 20.
CrossRef | Gscholar
(3)
Alexander ME, Stefner CN, Mason JA, Stocks BJ, Hartley GR, Maffey ME, Wotton BM, Taylor SW, Lavoie N, Dalrymple GN (2004). Characterizing the jack pine-black spruce fuel complex of the International Crown Fire Modelling Experiment (ICFME). Canadian Forest Service Information Report NOR-X-393, Northern Forestry Centre, Edmonton, Canada, pp. 49.
Gscholar
(4)
Baysal I (2021). Vertical crown fuel distributions in natural Calabrian Pine (Pinus brutia Ten.) stands. Croatian Journal of Forest Engineering 42 (2021) 2: 301-312.
CrossRef | Gscholar
(5)
Baysal I, Yurtgan M, Küçük O, Oztürk N (2019). Estimation of crown fuel load of suppressed trees in non-treated young Calabrian pine (Pinus brutia Ten.) plantation areas. Kastamonu University Journal of Forestry Faculty 19 (3): 350-359.
CrossRef | Gscholar
(6)
Baysal I, Bilgili E, Küçük O, Saglam B, Dinç Durmaz B (2015). Fuel characterization of Calabrian pine stands. In: Proceedings of the “International Wildland Fire Conference”. Pyeongchang (South Korea) 12-16 Oct 2015, pp. 672-672.
Gscholar
(7)
Bilgili E (1995). Fuel characterization and fire behavior prediction in even-aged conifer stands. PhD thesis, Faculty of Forestry, University of New Brunswick, Fredericton, NB, Canada, pp. 111.
Gscholar
(8)
Bilgili E (2003). Stand development and fire behavior. Forest Ecology and Management 179: 333-339.
CrossRef | Gscholar
(9)
Bilgili E, Küçük O (2009). Estimating above-ground fuel biomass in young Calabrian pine (Pinus brutia Ten.) in Turkey. Energy and Fuels 23: 1797-1800.
CrossRef | Gscholar
(10)
Bilgili E, Durmaz BD, Saglam B, Küçük O, Baysal I (2006). Fire behaviour in immature Calabrian pine plantations. Forest Ecology and Management 234S: S77-S112.
CrossRef | Gscholar
(11)
Bilgili E, Baysal I, Dinç Durmaz B, Saglam B, Küçük O (2010a). Türkiye’de 2008 yilinda çikan büyük orman yanginlarinin degerlendirilmesi [Evaluating big forest fire break out in Turkey in 2008]. In: Proceedings of the “III. Ulusal Karadeniz Ormancilik Kongresi”. Artvin (Turkey) 20-22 May 2010, pp. 1270-1279. [in Turkish]
Online | Gscholar
(12)
Bilgili E, Durmaz BD, Alexander ME, Saglam B, Küçük O, Baysal I (2010b). The effect of pruning on crown fire behavior in a Calabrian pine plantation, northeastern Turkey. In: Abstracts of the “VI International Conference on Forest Fire Research” (Viegas DX ed). Coimbra (Portugal) 15-18 Nov 2010, pp. 36.
Online | Gscholar
(13)
Botelho H, Vega JA, Fernandes PM, Rego F (1994). Prescribed fire behavior and fine fuel consumption in Northern Portugal and Galiza maritime pine stands. In: Proceedings of the “2nd International Conference on Forest Fire Research”. University de Coimbra (Portugal) 21-24 Nov. 1994, pp. 343-353.
Gscholar
(14)
Boydak M, Dirik H, Calikoglu M (2006). Biology and silviculture of Turkish Red Pine (Pinus brutia Ten.). OGEM Foundation Publication, Lazer Offset Press, Ankara, Turkey, pp. 253. [in Turkish]
Gscholar
(15)
Brown JK (1978). Weight and density of crowns of Rocky Mountains conifers. Research Paper INT-197, USDA Forest Service, Intermountain Forest and Range Experiment Station, Ogden, UT, USA, pp. 56.
Online | Gscholar
(16)
Burrows N, Smith R, Robinson A (1988). Prescribed burning slash fuels in Pinus radiata plantations in Western Australia. Technical Report no. 20, Dept. of Conservation and Land Management WA, Landnote 2/88, Perth, Australia, pp. 12.
Gscholar
(17)
Byram GM (1959). Combustion of forest fuels. In: “Forest Fire: Control and Use” (Davis KP ed). McGraw-Hill, New York, USA, pp. 61-89.
Online | Gscholar
(18)
Chen D, Li F (2010). The characteristics and biomass distribution in crown of Larix olgensis in Northeastern China. Journal of Korean Forest Society 99 (2): 204-212.
Online | Gscholar
(19)
Cruz MG, Alexander ME, Wakimoto RH (2003). Assessing canopy fuel stratum characteristics in crown fire prone fuel types of western North America. International Journal of Wildland Fire 12 (1): 39-50.
CrossRef | Gscholar
(20)
Cruz MG, Plucinski MP (2007). Billo road fire analysis of fire phenomena and suppression activities. Bushfire CRC Report A.07.02, Bushfire Cooperative Research Centre, Melbourne, Victoria, Australia, pp. 96.
Online | Gscholar
(21)
Cruz MG, Alexander ME, Plucinski MP (2017). The effect of silvicultural treatments on fire behaviour potential in radiata pine plantations of South Australia. Forest Ecology and Management 397: 27-38.
CrossRef | Gscholar
(22)
Cepel N, Tekerek O (1980). Antalya Orman Bölge Basmüdürlügü yöresinde bazi saf kizilçam mescerelerinin ölü örtü miktari üzerine arastirmalar [Investigations on the amount of litter of some pure Calabrian pine stands in Antalya Regional Directorate of Forestry]. Istanbul Üniversitesi Orman Fakültesi Dergisi Seri: A 30 (1): 111-128. [in Turkish]
Online | Gscholar
(23)
Douglas DR (1964). Some characteristics of major fires in coniferous plantations. Australian Forestry 28: 119-124.
CrossRef | Gscholar
(24)
Durkaya A, Durkaya B, Unsal A (2009). Predicting the above-ground biomass of calabrian pine (Pinus brutia Ten.) stands in Turkey. African Journal of Biotechnology 8: 2483-2488.
Online | Gscholar
(25)
Forrest WG, Ovington JD (1970). Organic matter changes in an age series of Pinus radiata plantations. Journal of Applied Ecology 7 (1): 177-186.
CrossRef | Gscholar
(26)
GDF (2018). Hacimahmut forest management plan. General Directorate of Forestry, Ankara, Turkey, pp. 325. [in Turkish]
Gscholar
(27)
GDF (2020). Forestry statistics. General Directorate of Forestry, Ankara, Turkey, web site. [in Turkish]
Online | Gscholar
(28)
GDM (2022). Turkish state meteorological service. Ankara, Turkey, web site.
Online | Gscholar
(29)
Güngöroglu C, Güney CO, Sari A, Serttas A (2018). Predicting crown fuel biomass of Turkish red pine (Pinus brutia Ten.) for the Mediterranean regions of Turkey. Šumarski List 11- 12: 601-610.
CrossRef | Gscholar
(30)
Keane RE (2013). Describing wildland surface fuel loading for fire management: a review of approaches, methods and systems. International Journal of Wildland Fire 22: 51-62.
CrossRef | Gscholar
(31)
Keane RE, Burgan R, Van Wagtendonk J (2001). Mapping wildland fuels for fire management across multiple scales: Integrating remote sensing, GIS, and biophysical modeling. International Journal of Wildland Fire 10: 301-319.
CrossRef | Gscholar
(32)
Koukoulomatis K, Mitsopoulos JD (2007). Crown fuel weight estimation of Black pine (Pinus nigra) plantations in southern Bulgaria. Silva Balcanica 8 (1): 57-65.
Online | Gscholar
(33)
Küçük O, Saglam B, Bilgili E (2007a). Canopy fuel characteristics and fuel load in young black pine trees. Biotechnology and Biotechnological Equipment 21 (2): 235-240.
CrossRef | Gscholar
(34)
Küçük O, Bilgili E, Baysal I (2007b). Fire development from a point source in surface fuels of a mature Anatolian black pine stand. Turkish Journal of Agriculture and Forestry 31 (4): 263-273.
CrossRef | Gscholar
(35)
Küçük O, Bilgili E, Saglam B (2008). Estimating crown fuel loading for Calabrian Pine and Anatolian Black Pine. International Journal of Wildland Fire 17 (1): 147-154.
CrossRef | Gscholar
(36)
Küçük O, Bilgili E (2008). Crown fuel characteristics and fuel load estimates in young calabrian pine (Pinus brutia Ten.) stands in northwestern of Turkey. Fresenius Environmental Bulletin 17 (12b): 2226-2231.
CrossRef | Gscholar
(37)
Kraft G (1884). Beitrage zur Lehre von den Durchforstungen, Schlagstellungen und Lichtungshieben [Contributions to the theory of thinning, felling positions and clearing cuts]. Klindworth’s, Hannover, Germany, pp. 147. [in German]
Online | Gscholar
(38)
Menning KM, Stephens SL (2007). Fire climbing in the forest: a semiqualitative, semiquantitative approach to assessing ladder fuel hazards. Western Journal of Applied Forestry 22: 88-93.
CrossRef | Gscholar
(39)
Mitsopoulos ID, Dimitrakopoulos AP (2007). Allometric equations for crown fuel biomass of Aleppo pine (Pinus halepensis Mill.) in Greece. International Journal of Wildland Fire 16: 642-647.
CrossRef | Gscholar
(40)
Neyisçi T (1986). Antalya Doyran yöresi kizilçam (Pinus brutia Ten.) ormanlarinda yanginlarin tarihsel etkileri [The historical role of fires on Pinus brutia Ten. forests of Antalya-Doyran region]. Ormancilik Arastirma Enstitüsü yayini, Teknik Rapor Serisi 29: 67-91. [in Turkish]
Gscholar
(41)
Odabasi T (1981). Korudagi kizilçam plantasyonlarinda mescere bakimi üzerine arastirmalar [Investigations on stand maintenance in KorudaÄŸ Calabrian pine plantations]. Istanbul Üniversitesi Orman Fakültesi Dergisi Seri A, Sayi 1: 75-104. [in Turkish]
Gscholar
(42)
Ritson P, Sochacki S (2003). Measurement and prediction of biomass and carbon content of Pinus pinaster trees in farm forestry plantations, south-western Australia. Forest Ecology and Management 175: 103-117.
CrossRef | Gscholar
(43)
Ruiz-González AD, Alvarez-González JG (2011). Canopy bulk density and canopy base height equations for assessing crown fire hazard in Pinus radiata plantations. Canadian Journal of Forest Research 41: 839-850.
CrossRef | Gscholar
(44)
Sönmez T, Kahriman A, Azahin A, Yavuz M (2016). Biomass equations for Calabrian pine in the Mediterranean region of Turkey. Šumarski List 11-12: 567-576.
CrossRef | Gscholar
(45)
Stocks BJ (1980). Black spruce crown fuel weights in northern Ontario. Canadian Journal of Forest Research 10 (4): 498-501.
CrossRef | Gscholar
(46)
Ter-Mikaelian M, Korzukhin M (1997). Biomass equations for sixty-five North American tree species. Forest Ecology and Management 97: 1-24.
CrossRef | Gscholar
(47)
Thanos CA, Marcou S, Christodoulakis D, Yannitsaros A (1989). Early post-fire regeneration in Pinus brutia forest ecosystems of Samos Island (Greece). Acta Oecologica / Oecologica Plantarum 10 (1): 79-94.
Online | Gscholar
(48)
Van Wagner CE (1968). Fire behaviour mechanisms in a red pine plantation: field and laboratory evidence. Departmental publication no. 1229, Canada Department Forestry and Rural Development, Ottawa, Canada, pp. 30.
Gscholar
(49)
Van Wagner CE (1977). Conditions for the start and spread of crown fire. Canadian Journal of Forest Research 7: 23-34.
CrossRef | Gscholar
(50)
Wang S, Niu S (2016). Fuel classes in conifer forests of Southwest Sichuan, China, And their implications for fire susceptibility. Forests 7 (12): 52.
CrossRef | Gscholar
(51)
Williams DF (1976). Forest fuels in unthinned Radiata pine stands. Australian Forestry 39: 239-244.
CrossRef | Gscholar

Authors’ Affiliation

(1)
Mehmet Yurtgan 0000-0001-9101-2514
Turkish Republic Ministry of Agriculture and Forestry Affairs, General Directorate of Nature Conservation and National Parks, 54000, Sakarya (Turkey)
(2)
Ismail Baysal 0000-0001-6789-5345
Izmir Ktip Çelebi University, Faculty of Forestry, 35620, Izmir (Turkey)
(3)
Omer Küçük 0000-0003-2639-8195
Kastamonu University, Faculty of Forestry, 61080, Kastamonu (Turkey)

Corresponding author

 

Citation

Yurtgan M, Baysal I, Küçük O (2022). Fuel characterization and crown fuel load prediction in non-treated Calabrian pine (Pinus brutia Ten.) plantation areas. iForest 15: 458-464. - doi: 10.3832/ifor4048-015

Academic Editor

Davide Ascoli

Paper history

Received: Dec 25, 2021
Accepted: Aug 08, 2022

First online: Nov 03, 2022
Publication Date: Dec 31, 2022
Publication Time: 2.90 months

© SISEF - The Italian Society of Silviculture and Forest Ecology 2022

  Open Access

This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Creative Commons Licence

Breakdown by View Type

(Waiting for server response...)

Article Usage

Total Article Views: 2682
(from publication date up to now)

Breakdown by View Type
HTML Page Views: 2264
Abstract Page Views: 237
PDF Downloads: 137
Citation/Reference Downloads: 2
XML Downloads: 42

Web Metrics
Days since publication: 87
Overall contacts: 2682
Avg. contacts per week: 215.79

Article citations are based on data periodically collected from the Clarivate Web of Science web site
(last update: Jul 2021)

(No citations were found up to date. Please come back later)


 

Publication Metrics

by Dimensions ©

List of the papers citing this article based on CrossRef Cited-by.

 

iForest Similar Articles

 

This website uses cookies to ensure you get the best experience on our website. More info