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iForest - Biogeosciences and Forestry
vol. 9, pp. 583-592
Copyright © 2016 by the Italian Society of Silviculture and Forest Ecology
doi: 10.3832/ifor1605-008

Review Papers

Post-fire soil hydrology, water erosion and restoration strategies in Andosols: a review of evidence from the Canary Islands (Spain)

Jonay Neris (1-2)Corresponding author, Juan C Santamarta (3), Stefan H Doerr (1), Francisco Prieto (4), Juan Agulló-Pérez (5), Paloma García-Villegas (5)


Andosols and soils with andic properties ([35]) are the most typical soils in volcanic regions. They cover only 1% or the world’s land surface (approximately 124 million hectares), but support 10% of the world’s population, including some of the most populated areas in the world ([51]). Andosols are found particularly around the Pacific rim and Pacific islands, the African Rift Valley, Atlantic islands of Macaronesia and areas of Italy, France, Germany and Iceland ([35] - Fig. 1a). Their volcanic nature provides high fertility to these soils and an increased resistance to erosion processes ([50], [58]) due to their mineralogy, containing non-crystalline minerals, high organic matter content (SOM), and the reciprocal stabilization of these fractions (Al-, Fe-humus complexes - [76], [32]). These properties contribute to the generally reported high infiltration rates, and low susceptibility to particle detachment and erosion processes of undisturbed Andosols ([50], [37]). Additionally, volcanic soils typically show high fertility and, consequently, are often associated with high population densities. However, Andosols’ properties and functions are highly susceptible to changes in land use ([9], [32], [63]) and vegetation ([37], [52]).

Fig. 1 - (a) Distribution of Andosols as: dominant soils (red), associated with other soil types (light green) and as inclusions (yellow). Miscellaneous lands in turquoise (inland waterbodies, glaciers and no data). Source: modified from Driessen et al. ([25]). (b) Location of the Canary Islands.

Along with disturbances related to land use and vegetation change, wildfires can lead to severe alterations of the hydrological and erosional responses of soils, sometimes with catastrophic consequences ([71]). Although few studies have evaluated fire impacts on Andosols properties, it has been demonstrated that temperature increases and intense drying processes due to deforestation can have a detrimental effect on their hydrological and erosional properties ([9], [77], [23]). In addition to these scientific findings, the history of the Canary Islands, a volcanic archipelago located between 27° 37′ and 29° 25′ N and 13° 20′ and 18° 10′ W (Fig. 1), includes numerous catastrophic hydrological and erosional events recorded in written records dating back from the 16th century to the present ([6], [64], Brito I, personal communication). The most recent catastrophic event took place in 2009 after a forest fire (4000 ha of pine forest burned) and a series of rainstorms (550 mm in 12 days) that triggered several debris flows, which even reached the coastline from an initial altitude of 800 m. They affected crops, housing, communication routes, water and electricity supply and other infrastructures (Fig. 2). This archipelago is particularly susceptible to the occurrence, and hence ideal for the study of, fire-induced catastrophic hydrological and erosional events due to its morphology, climate, soils, vegetation and population density. Its islands are characterized by steep slopes around volcanic cones (some 35% of the island of Tenerife exceeds 30% in slope) with Andosols frequently located on densely forested northern hillslopes. The annual precipitation exceeds 1000 mm in some areas and over 80% takes place in autumn and winter. Atlantic storms characterized by torrential rains exceeding intensities of 100 mm day-1 and 300 mm day-1, with return periods of 5 and 30 years respectively, are frequent in these seasons ([44]). Additionally, most islands are densely populated, with figures almost quintupling the European average (e.g., 542 people km-2 in Gran Canaria vs. 112 people km-2 in the European Union), which increases dramatically the probability of fire-induced catastrophic events. Forest fires are frequent in Canary Islands mainly due to: (i) the high human pressure on the wildland-urban interface; (ii) the large forested area, which covers 50% of some of the western islands; (iii) the botanical composition of these forests, which usually include highly flammable plants such as Pinus, Erica, Adenocarpus or Chamaecytisus; and (iv) the alternation of wet and dry seasons, which promote fuel load increase and facilitate the occurrence of wildfires, respectively ([56]). Several large and recurrent wildfires have occurred in the Canary Islands over the last 45 years (Fig. 3). The average number of wildfires per year is 70 and the average area affected is 2560 ha per year in the period 1968-2013 ([34]).

Fig. 2 - Landslides after the forest fire in La Palma (2009). Forest road before (a) and after (b) the torrential rains and subsequent landslides in 2009. Sediment deposition after the landslide affecting banana crops near the southern coastline of La Palma (c).
Fig. 3 - Examples of forest fires in the Canary Islands. Low (a), moderate (b) and high severity (c) according to the fire severity classification by Ryan ([70]).

Historical and recent catastrophic events triggered by torrential rains after forest fires in Andosols of the Canary Islands and worldwide highlight the post-fire geomorphological instability of Andosols. Therefore, it is essential to widen the knowledge on preventing the fire occurrence in this terrain type but, as fire is a recurrent environmental agent, also on predicting and mitigating the increased risk to the population downslope during the post-fire period. This review seeks to fill this research gap by summarizing current research on fire effects on Andosols’ properties and functions and innovative restoration strategies developed in the post-fire period, as well as identifying new lines of research on the fire-induced impacts on the hydrological and erosional response of Andosols, with a special focus on the contributions from the Canary Islands (Spain).

The impact of fire on Andosols’ properties 

Fire affects several properties of Andosols that are relevant to their hydrological and erosional responses. Andosols have shown a substantial decrease of aggregate stability (AS) after wildfire both in Canary Islands ([53]) and South America ([48]), which can reduce their infiltration capacity and enhance erosional processes. Data published by the above authors shows that AS figures decreased more than 15% in half of the fire-affected Andosols studied, whereas 30% of those Andosols showed a decrease of AS exceeding 20% (Fig. 4b). In contrast, the decrease in AS after fire reported for other soil types rarely exceeded 15% ([43], [57], [11], [74], [2], [75], [45], [4] - Fig. 4b). According to Mataix-Solera et al. ([45]) this is the typical response of soils such as Andosols, whose main binding agent is SOM ([12]). As reported by several authors ([18], [48], [53], [55]), Andosols’ SOM can be severely reduced and its chemical composition altered by fire. According to the aforementioned authors, fire-induced SOM reduction ranges from 20 to 4 g 100 g-1 and > 50% of the fire-affected soils evaluated showed a decrease in excess of 10 g 100 g-1 (Fig. 4a). Contrastingly, the reduction of SOM in non-volcanic soils rarely exceeds 5 g 100 g-1 ([30], [75], [16] - Fig. 4a). Additionally, several authors have reported a significant decrease in AS and the alteration of soil porosity of volcanic soils under severe drying processes ([9], [77], [24]). The combined impact of fire on both SOM and soil mineralogy could explain the considerably high reduction of AS exhibited by Andosols.

Fig. 4 - Comparison of the impact of fire on key soil properties in Andosols (red) and other soil types (green). Distribution of results reporting fire-induced reduction/increase in (a) soil organic matter (SOM: %) and (b) aggregate stability (AS: %) for Andosols (N = 7 for SOM and N = 6 for AS) and other soil types (N = 25 for SOM and N = 63 for AS) from published data. Values calculated as Unburned value minus Burned value. Data source: Andosols ([18], [48], [54]); other soil types ([30], [43], [57], [11], [74], [2], [75], [16], [45], [4]).

Increases in bulk density (BD) could be expected for soils after fire due to the reduction of aggregate stability and the decrease of the protection of the litter cover against raindrop impact ([28]). However, fire-affected Andosols have showed considerably low values of BD after fire, enhancing both wind and water erosion processes. Studies carried out in the Canary Islands ([53], [55]) and South-America ([48]) reported figures reaching 0.5 Mg m-3. This response can be attributed to irreversible changes in the soil structure due to severe drying processes, as previously observed in agricultural Andosols from the Canary Islands affected by intense drying periods ([31]). Neris et al. ([55]) hypothesized that, since wildfires lead to severe drying processes similar to those caused by land use change, a comparable response of bulk density can be expected. However, further research is needed to understand this response.

Fire-induced impacts on both aggregate stability and bulk density of Andosols affect their pore size distribution. According to Neris et al. ([53]), water retention at 33 kPa can show a considerable increase after the fire in accordance with the decrease of bulk density, but in contrast to the observed decrease in aggregate stability. Although an increase in water retention at 33 kPa of tension has been reported widely for different soil types, the reported figures for burned Andosols (up to 75% of water retention at 33 kPa after the fire) largely exceeded those reported for non-volcanic soils ([2], [72]). This can enhance infiltration and reduce both runoff and erosion. According to Stoof et al. ([72]) and Neris et al. ([55]), this response can be attributed to the incorporation of partially combusted char, which generally shows a higher amount of large pores compared to the soil itself ([14]). However, the effect of fire on water retention at 1500 kPa is generally less pronounced than at lower tensions. This is probably due to the limited impact of fire on soil texture, main responsible for water retention at this tension ([72], [53], [55]).

Most authors suggest that fire induces or enhances soil water repellency ([33], [40], [21]). However, the findings by Jordán et al. ([39]) in Mexican Andosols and Neris et al. ([53]) in Andosols from the Canary Islands disagree with this general trend. According to these authors, light-medium severity fires marginally enhanced surface SWR of non- or slightly-repellent Andosols, whereas SWR was greatly reduced in strongly-repellent soils after high severity fires, enhancing infiltration and reducing runoff. This response could be attributed to the different temperature reached on the soil surface during the fire ([71]). Laboratory studies showed that fire can enhance SWR at temperatures of 175-200 °C and destroy this feature above 270-600 °C, depending on heat duration and oxygen availability but irrespective of soil type ([19], [20], [8]).

Post-fire hydrological and erosional response 

Andosols have shown a rather specific hydrological and erosional response to the impact of environmental disturbances such as land use and vegetation change that can lead to severe risk for population and properties in the Canary Islands ([68], [36], [67], [52]) and elsewhere ([9], [10], [29], [38]). However, the hydrological and erosional response of this soil type in the post-fire period has received little attention. Existing studies highlighted that Andosols runoff processes also show quite specific post-fire responses. In general, most authors have reported detrimental impacts of fire resulting in reduced infiltration and enhanced runoff for most soil types ([33], [15], [69]). According to Doerr et al. ([22]) this response has been attributed to: (i) the fire-induced enhancement of SWR; (ii) a reduction of aggregate stability and porosity; and (iii) the reduction of vegetation cover and its protective effect. Poulenard et al. ([61]) and Morales et al. ([48]) also noticed a trend of reduced infiltration when studying Ecuadorian and Argentinian Andosols, respectively, with high infiltration rates in undisturbed conditions. However, Neris et al. ([53]), for Andosols from the Canary Islands, showed that high severity wildfires can also have a promoting effect on infiltration due to the reduction of SWR and the combustion and removal of highly water repellent surficial organic layers, which had reduced infiltration. Previous studies in the same area reported the presence of an extremely repellent forest floor in some forested undisturbed Andosols from the Canary Islands, which reduced infiltration rate to a fifth and doubled the values of runoff-rainfall ratio ([54]). Therefore, the combustion of this layer during high-severity fires can enhance infiltration, which could counteract the detrimental effect of fire on soil structure ([53]).

Regarding interrill erosion processes, Andosols follow the generally reported trend of fire-induced enhancement of soil loss, with figures from rainfall simulation experiments ranging from 30 to 2000 g m-2 h-1 depending on fire severity and rainfall intensity ([61], [48], [53]). Most authors hypothesize that this general response may be due to: (i) the increase in runoff; (ii) the decrease in soil cover and the protective effect of vegetation and organic layers (forest floor); and (iii) the reduction in aggregate stability ([71]). For Andosols, Poulenard et al. ([61]) attributed the increase in soil loss to the rise in runoff and decrease in aggregate stability causing surface sealing. Neris et al. ([53]) hypothesized that the reduction in structural stability and the loss of soil cover are the key factors in the erosional response, as no significant changes were found in infiltration after the fire. Morales et al. ([48]) highlight three factors (runoff, soil cover and aggregate stability) as being responsible for soil loss increase. Additionally, both Morales et al. ([48]) and Neris et al. ([53]) suggest that fire severity plays a key role in the erosion process as it greatly influences the soil cover and, thus, the protection against raindrop impact and detachment by runoff in the post-fire period. Soil erosion from rainfall simulation experiments by Neris et al. ([53]), Poulenard et al. ([61]) and Morales et al. ([48]) for fire-affected Andosols is comparable to that reported for other soil types and environments ([7], [14], [78], [59]). However, it has been demonstrated that Andosols’ low bulk density is half or even one third of that of other fire-affected soil types ([53]). Therefore, the expected volumetric soil loss can be considerably higher and its impact downslope can be catastrophic (Fig. 5). Regarding the erosion mechanism, Andosols show a distinctive behavior. According to previous studies, the erosion of this soil type is not a consequence of the dispersion of clay and transport of primary particles, but occurs mainly by detachment of small, highly water repellent, low bulk density, stable aggregates and their transport by flotation on the runoff ([61], [68], [48], [53]).

Fig. 5 - Comparison of post-fire sediment yields in Andosols and other soil types reported using rainfall simulations. Yield measured in weight (red) and volume (blue) for Andosols (left) and other soil types (right). Data source: (1): [48]; (2): [53]; (3): [54]; (4): [61]; (5): [78]; (6): [59]; (7) [14]; (8): [78].

As for other erosion types, several authors have reported the high susceptibility of undisturbed volcanic soils of tropical and sub-tropical areas to landslides and mudflows ([60], [68], [13]). These authors pointed out that the location of this soil type on steep slopes subject to torrential rains, combined with their high infiltration rate and water retention capacity, can lead to the fluidification of the soil layers, which act as triggering factors for landslides. As regards to wind erosion, most studies report that vegetation cover, soil moisture, aggregation and bulk density are key controls for this erosion type ([79], [46], [41]). To the author’s knowledge, no studies focusing on the impact of fire on the occurrence of landslides or of wind erosion in Andosol terrains are available in the literature. However, the hypothesis that wildfires can act as triggering factors for both erosion types is supported by scientific evidences and historic events. On one hand, several reported fire-impacts on the ecosystem may induce both landslides (such as an increase in Andosols’ infiltration, water retention capacity at low pressures and a reduction in soil cohesiveness) and wind erosion (such as a severe reduction in forest canopy, litter, soil bulk density and soil aggregation, and an increase in dry conditions). On the other, the catastrophic landslides and mudflows occurred in the Canary Islands and elsewhere in the world suggest that nowadays they are potential threats to lives and infrastructures. Therefore, more studies are needed to address this knowledge gap.

Post-fire restoration and mitigation strategies in Andosols of the Canary Islands 

Fire prevention and post-fire mitigation actions are the main strategies used by the agencies responsible of forest conservation and land management in the Canary Islands (the Cabildos), to avoid or reduce fire impacts on soil hydrology and erosion response. The information summarized in this section is based on the approaches adopted in the post-fire period by the Cabildo de Tenerife and Cabildo de La Palma. For these management bodies, post-fire restauration actions start with the evaluation of the impact of fire on environmental characteristics and functions, the prediction of the likely consequences and derived risks, and the organization of restoration and mitigation actions to reduce the expected impacts. Due to the particular characteristics of the Canary Islands (steep forested slopes, soils highly susceptible to fire impacts, frequent rainstorms in autumn and winter, and high population density downslope), the restoration and mitigation efforts are aimed at addressing three main objectives in the following order: (i) to mitigate the impact of fire on the hydrological and erosional response in order to reduce the risk to lives and infrastructures onsite and offsite; (ii) to restore the landscape aesthetics and other ecological functions; (iii) to manage the remaining fuel load in order to limit the occurrence of new wildfires. As regard the mitigation treatments, reforestation is not usually included in restoration programmes in the Andosols of the Canary Islands, though the use of vegetation to increase soil protection against erosion and surface runoff is a common action in fire affected areas worldwide. This is due to the high fire resistance and sprouting capacity of the main forest species present in forested areas that experience frequent fires (Fig. 6). Pinus canariensis, the endemic pine species in the Canary Islands, shows several fire adaptations including thick bark and buds, long needles, tall growth habit and sprouting capacity ([17]). Additionally, one of the main genus present in the Canarian rainforest, Erica, also exhibits high sprouting capacity after fire ([42]). According to the aforementioned agencies, the fast recovery after fire makes reforestation unnecessary. Instead, silvicultural practices on the affected area are carried out, including the removal of dead individuals and the pruning of charred branches of surviving trees to reduce infestation threats and strengthen their recovery (Fig. 7). However, recent observations after a forest fire that affected La Gomera in 2012 suggest that these silvicultural practices could delay vegetation recovery after fire. In order to clarify this point, a specific monitoring programme is currently in place.

Fig. 6 - Examples of sprouting behavior of forest species after a wildfire. Pinus canariensis (a) and Erica sp. (b) sprouting 3 months after the forest fire. Forest recovery 1 year after the forest fire (c).
Fig. 7 - Example of restoration works after the large forest fire of 2007 in Tenerife. Fire-affected forest area before (a) and after (b) silvicultural practices.

In addition to the traditional channel treatments, an innovative structure adapted to local conditions, called rock and biomass mixed dam, was developed after a forest fire in Tenerife that burned 17 000 ha in the summer of 2007 ([47]). Due to the magnitude of the wildfire and the resulting risks, the structure was designed to be low-cost, easy and rapid to be implemented to reduce hydrological risks. The mixed dam is a temporary structure that combines different mitigation techniques such as contour logs, contour trenches and rock dams. Similarly to other channel treatments, its main objective is to reduce water velocity and enhance infiltration and sediment deposition. The mixed dam consists of vegetal debris used as vertical stakes (mainly burned logs of Erica sp. and Myrica faya) and horizontal logs (mainly from burned Pinus canariensis) and biodegradable rope to tie the stakes and logs together as a trench and to anchor the whole structure to adjacent trees. The trench is reinforced on the outside by the rock slope to gain stability (less than 50% slope angle) and filled on the inside with vegetal debris obtained from silvicultural work and topped again with rocks (Fig. 8). Its dimensions vary depending on the channel width, although always ranging from 1 to 2 m in height and 8 to 10 m in width. A prediction of the maximum water flow and water level expected in the post-fire period are essential to design these structures. Additionally, the rock density, the resistance to flexion of the wood stakes and logs, the resistance reduction coefficients and the load increase coefficients for both permanent (structure weight) and temporary loads (water flow) are taken into account in their design. The distance between these structures in a channel is determined according to the structures’ height and the channel slope angle ([73]).

Fig. 8 - Construction process of the rock and biomass mixed dam. Trench constructed and filled with debris from the silvicultural works (a) and reinforced by rocks (b).

This structure is usually used as a principal treatment in ephemeral or small-order channels and as a secondary treatment complementing rock dams and gabions in larger channels. Due to the biodegradable nature of most of their components, these structures can also facilitate colonization by plants ([73] - Fig. 9). This innovative structure has several useful features: (i) it reduces the channel slope and, thus, water speed and detachment capacity; (ii) promotes infiltration and sedimentation; iii) economizes resources and time by using on-site material for its construction; (iv) enhances the colonization of vegetation due to the biodegradable nature of most of its components. The advantages attributable to this mixed dam are: (i) notable sediment storage capacity, mainly large material as vegetal debris or rocks; (ii) high adaptability of the design and the components used to the environment conditions; (iii) notable vegetation recovery and colonization of the channels due to the nature of its components.

Fig. 9 - A mixed dam structure built in Tenerife after the large wildfire of 2007, colonized by forest species one year after its construction.

Regarding hillslope treatments, the construction of erosion barriers to reduce runoff and sediment transport is the most used mitigation action in the Canary Islands. It includes contour-felled logs and small dams constructed using vegetal material, mainly small burned logs and branches obtained from the silvicultural work (Fig. 10). Due to budget constraints, no monitoring programmes have been put in place to evaluate the effectiveness of these treatments for Andosols. However, erosion barriers, widely used at the beginning of the century as an effective on-site control of runoff and erosion in Spain ([26], [5], [27]) and elsewhere ([62], [66], [49], [1], [3]), have been replaced lately by dry mulch treatments by land managers. This treatment aims to provide cover to the mineral soil, since most studies indicate that the proportion of bare soil is the main driving factor of soil erosion in the post-fire period ([65]). In spite of these new insights, no surface treatments like mulching are commonly used in Andosol terrain on the Canary Islands due to: (i) the generally rapid recovery of the main species of forested areas in the Archipelago (Pinus canariensis and Erica sp.), which provide a litter layer to protect the mineral soil; and (ii) the higher cost of surface treatments. However, as reported by Neris et al. ([53]), the recovery of the protective soil organic layers after a wildfire in pine forest can be delayed by the effect of high severity crown fires. These authors found two different situations after the fire according to fire severity. After surface fires of light to moderate severity, the soil surface is rapidly covered by pine needles from the scorched crowns, and erosion processes increase slightly in comparison to unburned areas. However, after crown fires of high severity, the soil surface is generally completely bare during the first post-fire year and the soil loss rate increases by up to three orders of magnitude ([48], [53]). This suggests that the application and evaluation of innovative surface treatments which have been highly effective in different terrains could also be also applied to Andosols.

Fig. 10 - Example of surface treatments after the large wildfire of 2007 in Tenerife. Small dams built using on-hand logs and branches.

Conclusions and perspectives  

This review examined the main studies and management approaches related to the impact of forest fires on the hydrological and erosional responses of Andosols of the Canary Islands (Spain) within the context of the global knowledge, in order to identify main findings, knowledge gaps and promising new lines of research for reducing risks in the post-fire period.

Andosol terrains are frequently located on steep slopes of volcanic areas with high annual precipitation, regular rainstorms and dense fire-prone forest cover situated above heavily-populated areas. The existing limited knowledge on the impact of fire on key properties of Andosols suggests that their response to fire is: (i) similar to other soil types but magnified by soil properties such as SOM, aggregate stability or pore size distribution; (ii) significantly dif-ferent from other soil types in soil properties such as bulk density or SWR, which show the opposite trend to non-volcanic soils. Such divergences in understanding and predicting soil hydrological response to fire based on key soil properties highlight that further research is needed in order to establish the base knowledge necessary for effectively predicting and mitigating future risks.

The existing studies on the hydrological and erosional response of Andosols to fire highlighted an increased soil loss rate, as expected due to their low bulk density. However, those studies are few and limited to the evaluation at microplot scale. Additionally, little attention has been given to date to the impact of fire on other important erosion types such as wind erosion and landslides. These research gaps should be addressed by evaluating the response of Andosols at different scales and to dif-ferent erosion types with the aim of developing prediction and mitigation tools for disaster risk reduction.

In the Canary Islands, silvicultural practices aimed at reducing infestation threats have replaced reforestation actions due to the high resprouting capacity of the main species present in their fire-prone areas. Traditional slope treatments such as contour-felled logs and log dams are used in the post-fire period, along with a new and inexpensive channel treatment consisting of a mixed dam of stones and biomass. However, the effectiveness and cost-benefit ratio of the classical and novel mitigation treatments used has not been assessed to date. Furthermore, innovative surface treatments such as dry mulching or seeding, largely applied in other terrain types, have not been tested either in Canary Islands or other Andosol terrain elsewhere.

Given the importance of Andosols in densely populated areas, it is essential to address these knowledge gaps in order to allow development of cost-effective approaches for mitigating accelerated hydrological and erosional events after fire in volcanic areas around the world.


This research was funded by the H2020 Marie Sklodowska - Curie Individual Fellowship 2014 “FireAndRiskPrevention” from the European Commission (project number 655993).


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Neris J, Santamarta JC, Doerr SH, Prieto F, Agulló-Pérez J, García-Villegas P (2016).
Post-fire soil hydrology, water erosion and restoration strategies in Andosols: a review of evidence from the Canary Islands (Spain)
iForest - Biogeosciences and Forestry 9: 583-592. - doi: 10.3832/ifor1605-008
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Paper ID# ifor1605-008
Title Post-fire soil hydrology, water erosion and restoration strategies in Andosols: a review of evidence from the Canary Islands (Spain)
Authors Neris J, Santamarta JC, Doerr SH, Prieto F, Agulló-Pérez J, García-Villegas P
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