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iForest - Biogeosciences and Forestry
vol. 10, pp. 303-308
Copyright © 2017 by the Italian Society of Silviculture and Forest Ecology
doi: 10.3832/ifor1901-009

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Biodiversity inventory of trees in a neotropical secondary forest after abandonment of shaded coffee plantation

Norberto Emídio Oliveira-Neto (1)Corresponding author, Diego Raymundo Nascimento (1), Fabrício Alvim Carvalho (2)

Introduction 

The development of agriculture in Brazil has led to a high degree of fragmentation of the Atlantic Forest, with the formation of landscape mosaics between secondary and mature forests, and the subsequent extinction of several species belonging to the native flora ([11]). The areas with the highest levels of degradation coincide with the main areas of economic development in the country ([2]). Based on current cover rates of the tropical forest vegetation, it is clear that the few existing mature forests will eventually disappear. These ecosystems are being more and more replaced by a complex mosaic of small forest fragments at different successional stages, in most cases separating agricultural crops from urban areas ([34]).

Mature forests of neotropical regions are currently subject to a great human pressure, while secondary forests have the potential to remain ecologically untapped due to their rapid growth characteristics ([13]). Its vast extension in humid tropics and its predominance in biomes such as the Brazilian Atlantic Forest, calls for an increased understanding and appreciation of the environmental services provided by these forests by addressing the existing research gaps and providing the scientific basis of reforestation and restoration methods ([8]).

Phytosociological studies conducted in forest fragments in southeastern Brazil provided important advances to the knowledge of forest succession under anthropogenic influence ([38], [10], [24], [3], [5], [25]). Such information may help planning of appropriate management practices, particularly where species with viable economic production are present in the study area. Chazdon et al. ([8]) claim that the management of secondary formations is one of the greatest potential solutions to increasing biodiversity conservation of tropical forests, including Brazilian forests.

This study focused on a secondary Atlantic Forest formerly used as a shaded coffee plantation (Coffea arabica), that has been naturally regenerating in the last 70 years after abandonment. The main goal was to evaluate the structure and species diversity of its tree regenerating community. We tested the hypothesis that the forest would present distinct successional tree community indicators (structural and diversity parameters) in comparison with secondary forests studied to date, with the same abandonment time in the region, due to its history of regeneration from shaded plantations.

Materials and methods 

The study area was located in an Atlantic Forest fragment that belongs to the Federal University of Juiz de Fora Botanical Garden (JB-UFJF) in the city of Juiz de Fora, Minas Gerais, southeastern Brazil (Fig. 1). The JB-UFJF covers about 80 ha and is contiguous to the Environmental Protection Area of “Mata do Krambeck” forest, forming an extensive urban forest remnant with a total area of approx. 370 ha. According to Köppen, the climate is humid subtropical (Cwa) with two distinct seasons: summer-spring, with higher temperatures and rainfall (October to April); and autumn-winter, which is colder and drier (May to September - [10]). The annual rainfall average is close to 1500 mm, with the highest rates in January (ca. 300 mm), while the annual temperature average is around 18.9 °C ([10]). The relief is formed by very old rocks, basically gneiss and granite, with predominant soils classified as Dystrophic Yellow Oxisoils ([27]). The forest vegetation is classified as mountainous semi-deciduous (seasonally) forest according to the Brazilian Vegetation System ([15]).

Fig. 1 - Geographical location of the study area, a secondary forest regenerating after the abandonment of a shaded coffee plantation (Coffea arabica) in the Botanical Garden of the Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Southeastern Brazil.

The entire area corresponding to the JB-UFJF was formerly a coffee crop plantation (Coffea arabica L.) cultivated both in full sun and under the canopy of native forest species, especially Pau-jacaré (Piptadenia gonoacantha [Mart.] J.F.Macbr.), a large size, long-lived pioneer tree species native to Brazilian seasonal forests and exploited for tannins ([6]). The current forest cover of JB-UFJF results from the abandonment of coffee crops and cattle pastures, which gave rise to a mosaic of different successional stages related to the past use of the area. Forest patches are found from early stages of succession after grazing abandonment to more mature woodlands with low anthropogenic interference, characterized by the presence of large remnant native trees.

This study was conducted in a forest patch (a section of a former coffee plantation grown under P. gonoacantha canopy), abandoned about 70 years ago ([27]). The surveyed area covers approximately 15 ha (center coordinates: 21° 43′ 59.216″ S, 91° 22′ 19.359″ W), and represents an intermediate succession stage according to criteria established by the Brazilian Environmental Resolution (CONAMA 392/2007).

Twenty-five permanent plots of 20×20 m (400 m2) were established in the surveyed area, with a total sampled area of 1 ha ([9]). We measured the diameter of all living and standing dead individual trees with a DBH ≥ 5 cm (diameter at breast height at 1.3 m from the soil). The botanical material collected was identified using the CESJ herbarium collection from UFJF and the collection of Plant Ecology Laboratory (UFJF). The specific nomenclature and the abbreviations of the names of authorities follow the Species List of Brazilian Flora (⇒ http:/­/­floradobrasil.­jbrj.­gov.­br/­). The classification of botanical families followed the APG III system ([1]).

The characterization of the tree community was carried out by calculating following phytosociological parameters for each species: species richness (S), absolute density (AD), total and individual basal area (BA), relative frequency (RF), relative density (RD), relative dominance (RDo), and importance value (IV, [17] - eqn. 1):

\begin{equation} IV = RF + RD + RDo \end{equation}

Species diversity was estimated using the Shannon’s diversity index (H’ - eqn. 2):

\begin{equation} H^{\prime}= -\sum_{i=1}^{n}p_{i}\; log\; p_{i} \end{equation}

where pi is the proportion of the i-th species, and n is the total number of species. This index is more influenced by species with a lower density, i.e., locally rare ([20]). The Pielou’s evenness index (J) was used to estimate the species uniformity of the community.

Results 

We sampled a total of 1927 individual trees, of which 1837 were living trees. We found 117 species belonging to 84 genera and 33 families (Tab. 1). The five families with the highest species richness were Fabaceae (17 species; 14.6% of the total), Myrtaceae (10; 11.6%), Moraceae (9; 7.8%), Lauraceae (8; 6.9%), and Annonaceae (7; 6.0%), which together accounted for 46.2% of the total number of sampled species. Among the most abundant families in the area, five had the highest density of individuals: Arecaceae (824 individuals; 44.9% of the total), Fabaceae (234; 12.7%), Annonaceae (186; 10.1%), Rubiaceae (66; 3.6%), and Sapindaceae (65; 3.5%), which together accounted for 74.8% of the total number of sampled individuals.

Tab. 1 - Results of the phytosociological survey of the tree population sampled in the secondary forest regenerating after the abandonment of a shaded coffee plantation (Coffea arabica) in the Botanical Garden of the Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais (southeastern Brazil). Species are listed in a decreasing order of importance value (IV). (AD): absolute density (ha-1); (BA): basal area (m2 ha-1); (FA): absolute frequency; (RD): relative density; (RDo): relative dominance; (RF): relative frequency; (IV): importance value; (%IV): importance value as percentage; (*): Non-native species. 

We also sampled 89 standing dead trees, representing 4.6% of all sampled trees. The community had a total basal area of 43.61 m2 ha-1, and a strong dominance of few species. The five species with the highest importance value (IV) in the community were Euterpe edulis (22.9%), Piptadenia gonoacantha (16.5%), Xylopia sericea (5.7%), Annona cacans (3.5%), and Syagrus romanzoffiana (3.3%), which together amounted to 51.9% of the total IV. Euterpe edulis had the highest abundance (759 ind ha-1), represented 41.2% of the total, and was present in all plots. Not surprisingly, the species with the highest basal area was P. gonoacantha (16.60 m² ha-1), representing 38.2% of the total.

The value of Shannon’s diversity species index for the whole community was H’ = 2.92, while that of the Pielou evenness index was J = 0.61. Excluding the high-density species E. edulis from the analyses, the highest values were H’ = 3.83 and J = 0.80.

With 117 species in a standard 1-ha sampled area, we found the highest species richness compared to secondary patches with the same vegetation type in the region, which registered 105 ([3]), 78 ([10]) and 48 species ([25]), respectively. Among the rare species in the sample, we found the climax species Abarema cochliocarpos and some late secondary species (such as Andira fraxinifolia, Ceiba speciosa, Aspidosperma australe, Inga cylindrica and Nectandra lanceolata), suggesting the potential of the area to conserve species with advanced succession. Based on the lists of threatened species prepared by the IUCN ([16]), four species were considered “vulnerable” for the state of Minas Gerais: Dalbergia nigra, Euterpe edulis, Ocotea odorifera, and Protium heptaphyllum. The high-density species E. edulis is also in the “endangered” category. These same species were also found on the Brazilian official list of endangered flora species ([22]). These results demonstrate the relevance of the study area in terms of high tree species richness, including endangered species.

Discussion 

The richest families in this study, Lauraceae, Myrtaceae, and Moraceae, follow the phytogeographical pattern found by Oliveira-Filho & Fontes ([26]) for semideciduous seasonal forest formations in southeastern Brazil. The composition in botanical families suggest a more advanced successional stage for the surveyed area, due in particular to the dominance of families with zoochorous dispersal of fleshy fruits and large seeds, such as Annonaceae, Lauraceae, Myrtaceae, and Moraceae ([37]). Myrtaceae species are considered important for the development of low-growing vegetation communities, especially because their fruits are appreciated and dispersed by animals ([35]). The Ficus genus stands out with four species within the Moraceae family, and according to Carauta ([4]), fig trees are key components of many tropical forests, since a wide variety of animals feeds on their fruits, including mammals, birds, and even fish. These species are responsible for the dispersion of seeds, thus helping the regeneration of the forest. The Lauraceae family, which had one of the largest importance value in the study area, is considered to be relevant in the structural composition of large areas of the Atlantic Forest ([36], [37]).

The high species richness in terms of families including species with zoochoric dissemination can be directly related to two reasons: (1) the former anthropogenic management of the surveyed area, especially due to the former presence of coffee crops under shading; and (2) the high density of E. edulis trees in the community. Several studies showed that tropical forests grown after coffee crop abandonment have a high diversity of animal species and native plants ([29], [28], [18]). It is believed that the trees of the former shading canopy remained after the abandonment could play an important role in the following succession, as they supply seeds for regeneration stored in the shaded soil, and shelter the recruitment of trees under their canopies even after the canopy closure ([7]). From this perspective, the predominant species E. edulis in the investigated area could have substantially contributed to the observed diversity by attracting animals that scatter seeds of other tree species, thus effectively contributing to the creation of the forest food web ([33]).

The Shannon’s diversity index (H’ = 2.92) observed in this study was consistent with those found in similar studies on nearby secondary forests with the same vegetation type. For example, Fonseca & Carvalho ([10]) obtained an index H’ = 2.82 in a forest fragment at the regeneration stage, while Moreira ([25]) observed a value of 2.84 in a small forest after more than 40 years since the abandonment, and Brito & Carvalho ([3]) reported a value of 3.30 in a forest patch in an intermediate stage of succession. However, the forest patch analyzed in this study showed a lower diversity value as compared with the other three adjoining areas. Indeed, the lower evenness value (J = 0.61) reflects the high density of E. edulis trees, indicating that only 61% of the maximum hypothetical diversity (H’) was reached in the studied area. On the other hand, excluding this species from computations resulted in diversity indices of H’ = 3.82 and J = 0.81 (more than 80% of the maximal hypothetical diversity). Slightly larger values were found by Garcia ([12]) and Valente et al. ([38]) in nearby conserved forests (H’ = 4.29 and H’ = 4.11, respectively) located in remote areas not inserted into the urban context. Such comparisons better highlight the results obtained in the study area, where the dominance of a single species (E. edulis) did not hamper the presence in the community of other 116 species, resulting in the highest richness and one of the highest diversities (H’) observed for forests in the region.

In this study, phytosociological analysis revealed a strong ecological dominance by E. edulis and P. gonoacantha. According to Kent & Coker ([17]), the most important species in terms of importance value (IV) are those better exploiting the habitat resources, representing the core of the community structure. According to Reis et al. ([32]), E. edulis stands occur in habitat rich in water, organic matter, and shade. Indeed, the presence of springs and drainage channels in the study area suggests a high moisture content, which apparently is the key to the success of this species. Forest use history also contributed to the high density of E. edulis. This species occurs naturally in the area, but its density increased after the management related to the former coffee plantation. When intercropped with P. gonocantha, a rapid-growth large species used for coffee shading, it is likely that E. edulis found its optimal conditions, as it requires shading in the early stages of development. In fact, a high incidence of sunlight can result in drying of recalcitrant seeds of this species in the soil seed bank ([30], [31]).

The low percentage of dead standing trees observed in this study (4.7%) suggests that the forest community is in a more advanced successional stage as compared with studies on the same vegetation type in the area, whose percentage exceed 15% ([10], [3], [25]). According to Chazdon ([7]), more developed forests tend to have a lower percentage of dead trees. This is fairly common in secondary forests where pioneer species are replaced by secondary species along the succession. With a low dominance of pioneer species, competition among lower diameter classes decreases, and thus the mortality rate in competition tends to be lower ([7]).

Overall, our results support the hypothesis of a well-structured community in more advanced successional stages in relation to nearby secondary forests with similar periods of abandonment. The dominant species E. edulis seems to be an efficient attractor of associated fauna and flora. Our findings suggests that coffee cultivation under shading, intercropped with native species of commercial interest, can be a good option for both production and conservation of species diversity.

We also found a peculiar combination of species recorded for the first time for semideciduous seasonal forest formations of the Juiz de Fora region, mainly attributed to the high density of E. edulis and the high basal area of Piptadenia gonoacantha. This species combination, along with the naturalization of exotic species (Coffea arabica, Eryobotria japonica, Morus nigra, etc.) and the proximity to a major urban center, suggests that this area can be considered a “novel ecosystem” sensu Hobbs et al. ([14]). According to these authors, “novel ecosystems” arise from altered biotic elements, such as soil fertility, degradation, and the introduction of species. Many characteristics of our study area are similar to those observed for “novel ecosystems” in abandoned coffee plantations in Puerto Rico ([19]), e.g., the increase in density of large individuals (DBH > 55 cm) of P. gonocantha in comparison with the surrounding forest communities, or the presence of dominant species in the community ([21]). In this study, only two native species (E.edulis and P. gonacantha) accounted for 48.4% of individuals.

Conclusion 

Areas with a history of intensive coffee farming, especially monocultures, are common throughout southeast Brazil. Many of these areas were abandoned and regenerated naturally thereafter. Understanding these “novel ecosystems” is fundamental for conservation of biodiversity. In this study, we found 117 species belonging to 84 genera and 33 families in a forest patch grown in a former coffee plantation 70 years since its abandonment, This suggesting the potential of such secondary ecosystems in the conservation of local species. Our results showed that coffee cultivation under shading, intercropped with native species of commercial interest, could be a good option for both production and biodiversity conservation.

According to Marris et al. ([23]), the adoption of the “novel ecosystems” concept in the analysis of ecological conditions of forests may improve the study of new features acquired in response to anthropogenic impacts and promote the conservation of ecosystems previously considered of poor interest.

Acknowledgements 

We thank the researchers from Herbarium CESJ-UFJF, especially Daniel S. Pifano, Kelly Antunes and Ricardo Castro for their assistance in botanical identification; students of Plant Ecology Laboratory (Department of Botany, UFJF) and José Carlos, for assistance in the field work; Dr. Guilherme R. Rabelo (UENF) and Dr. Arthur S. M. Valente (IEF), for revising the manuscript; Postgraduate Program in Ecology (PGECOL-UFJF) for logistical support; CAPES, for granting scholarships to N.E. Oliveira-Neto; and FAPEMIG, for financial support (Project APQ 04438/10).

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Oliveira-Neto NE, Nascimento DR, Carvalho FA (2017).
Biodiversity inventory of trees in a neotropical secondary forest after abandonment of shaded coffee plantation
iForest - Biogeosciences and Forestry 10: 303-308. - doi: 10.3832/ifor1901-009
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Paper ID# ifor1901-009
Title Biodiversity inventory of trees in a neotropical secondary forest after abandonment of shaded coffee plantation
Authors Oliveira-Neto NE, Nascimento DR, Carvalho FA
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