Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests

Silva, Daniel Augusto da; Pfeifer, Marion; Pattison, Zarah; Vibrans, Alexander Christian

doi:10.1016/j.foreco.2020.118477

Cited by 7 publications

(5 citation statements)

References 105 publications

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“…This suggests the need for more complex hypotheses, looking to incorporate additional environmental predictors including topography (Rodrigues et al 2019), soil (Bordin & Müller 2019), landscape configuration (Hernández-Stefanoniet al 2011), and disturbance presence (Coelho et al2020) and history (Pflugmacher et al 2014). 'Distance to forest edge', as a measure of anthropogenic pressure, is an important component in determining both AGB stocks and AGB change and we have previously explored the direct and indirect pathways driving this edge effect (da Silva et al 2020). In short, we know that forest fragmentation as a result of extensive agriculture creates forest edges, which in turn limits LAI through harsher environment conditions and increased human accessibility.…”

Section: Discussionmentioning

confidence: 99%

“…Biomass recovery is slower in isolated forest patches because of harsher environmental conditions reducing plant colonization and survival (Poorter et al 2016). Edge effected habitats within forest patches are under chronic disturbance from selective logging, cattle grazing, and fire shaping species composition, canopy closure and biomass stock and growth (da Silva et al 2020;Lingner et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Biomass stock and growth are modulated by anthropogenic pressures, canopy structure and tree biodiversity in fragmented Atlantic Rainforest

Silva,

Pfeifer,

Vibrans

2024

Preprint

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Fragmented landscapes are becoming the norm in tropical regions. Understand how fragmentation can affect the ‘biodiversity-productivity’ relationship is essential to access the biomass budget and understand forest dynamics in these landscapes. Here, we used data from 108 permanent plots (4,000 m² each) of the National Forest Inventory to test the effect of tree species richness, species composition, leaf area index (LAI) and edge effect on biomass stock and change (5-year interval) in Santa Catarina, Brazil. We found an average biomass stock of 133.59 (± 67.24) Mg ha-1, and biomass change of 9.36 (± 12.08) Mg ha 5yr-1. Distance to forest edge interacted with species richness and composition limiting biomass stock, while LAI positively affected the stock. Biomass change increased in plots with higher number of pioneer species and located distant from the forest edge. Our results show how pervasive human pressure can be in fragmented landscapes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomass stock and growth are modulated by anthropogenic pressures, canopy structure and tree biodiversity in fragmented Atlantic Rainforest

Silva,

Pfeifer,

Vibrans

2024

Preprint

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“…As an indirect measure of microclimate and availability of light (Hardwick et al, 2015), we estimated canopy cover (FCover) from HPs following the methodology described in da Silva et al (2020). We took 20 upward looking images (10 m apart) in each sample unit (4000 m 2 ), using a Nikon D3100 DSLR camera equipped with a Nikon Fisheye Nikkor 10.5 mm lens levelled at 1.30 m height aligned with the magnetic north.…”

Section: Methodsmentioning

confidence: 99%

“…Forest edges and canopy gaps are characterized by reduced biomass stocks and growth and elevated presence of human activities (da Silva et al, 2020; Lingner et al, 2020). Forest edges have different microclimatic conditions (Davies‐Colley et al, 2000) and are more prone to be affected by fire (Silvério et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Conspecific density plays a pivotal role in shaping sapling community in highly fragmented subtropical forests

2022

Self Cite

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Tropical and subtropical regions shelter high levels of biodiversity. A combination of biological, environmental and anthropogenic factors influences tree community diversity and composition. Here, we use data from the IFFSC project to test the effect of conspecific and heterospecific density dependence, canopy cover and distance to edge on saplings populations of 229 woody species in 159 plots distributed across three forest types in Southern Brazil. All plots were measured twice with a standardized time interval of 5 years. We fitted one ordinary least square regression model to each species to test the strength of each predictor on the species' population growth rate, and one global mixed effect model including forest type, ecological group and the interaction between distance to edge and conspecific density to test their impact in the overall trend of the species. Our analysis provided circumstantial evidence that conspecific density dependence is shaping diversity of forest fragments. This mechanism was present for 75.5% of the species, while heterospecific density affected 10% of the species. Canopy cover affected the population dynamics of 9.2% of the species and distance to edge affected 7.4% of the species. Forest type had a significant effect in the global model, suggesting that population dynamics differ between different forest formations. Ecological group was not significant in the global model suggesting that the mechanism affects species similarly despite their ecological group. The interaction between distance to edge and conspecific density was significant in the global model, suggesting that this mechanism differs between interior and edge of fragments. This work represents one of the few large-scale analyses of conspecific density dependence in fragmented secondary forests. Our results show that, once the forest is stablished, conspecific density dependence is crucial in sapling population dynamics, despite high levels of fragmentation.

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“…We took three hemispherical canopy images at each quarter point and the midpoint on the diagonal line of each quadrat, for a total of 600 images. Photographs were taken at sunrise or sunset on sunny days to avoid direct sunlight [39]. We used Hemiview2.1 software to analyze the images and calculate canopy opening (Co) and leaf area index (LAI) [40].…”

Section: Environmental Variablesmentioning

confidence: 99%

Effects of Tree Diversity, Functional Composition, and Large Trees on the Aboveground Biomass of an Old-Growth Subtropical Forest in Southern China

Wang

Zheng

Zhang

et al. 2023

Forests

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Forest aboveground biomass (AGB) plays an important role in regulating the global carbon cycle and is thus an essential component of ecosystem functioning. In the relationships between biodiversity and ecosystem functioning (BEF), studies have shown that many biotic factors (e.g., species, functional traits, and large trees) and abiotic factors have significant impacts on AGB. However, the relative strength of these affecting factors remains unclear. In this study, we analyzed woody plants (diameter at breast height [DBH] ≥ 1 cm) within a 1.6 ha plot in an old-growth subtropical natural forest in southern China. We used structural equation models to test the effects of tree diversity (species, phylogenetic, functional, and size inequality), functional composition, large trees, and environmental factors (topography, soil nutrients, and understory light) on AGB. Our results indicated that size inequality, the community-weighted mean of maximum DBH (CWM_MDBH), and large trees had significant, positive effects on AGB (p < 0.001), while lower soil phosphorus content was found to promote an increase in AGB. Furthermore, large trees, which were mostly composed of dominant tree species, were the main driver of AGB, and the effect of functional composition (e.g., CWM_MDBH) on AGB was substantially reduced by large trees. We argue that the selection effect plays a key role in regulating BEF relationships in subtropical natural forests and conclude that retaining large-diameter trees and dominant species, along with sustaining a complex stand structure, are key measures for improving productivity.

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Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests

Cited by 7 publications

References 105 publications

Biomass stock and growth are modulated by anthropogenic pressures, canopy structure and tree biodiversity in fragmented Atlantic Rainforest

Biomass stock and growth are modulated by anthropogenic pressures, canopy structure and tree biodiversity in fragmented Atlantic Rainforest

Conspecific density plays a pivotal role in shaping sapling community in highly fragmented subtropical forests

Effects of Tree Diversity, Functional Composition, and Large Trees on the Aboveground Biomass of an Old-Growth Subtropical Forest in Southern China

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