气候变化领域集成服务门户(CCPortal): Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests

CCPortal

DOI	10.1016/j.foreco.2020.118477
	Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests
	da Silva D.A.; Pfeifer M.; Pattison Z.; Vibrans A.C.
发表日期	2020
ISSN	0378-1127
卷号	476
英文摘要	The Atlantic Forest, a global biodiversity hotspot, has changed dramatically due to land use pressures causing deforestation, degradation, and forest fragmentation. A major challenge is to understand and potentially mitigate the consequences of these changes, for the capacity of forests to deliver essential environmental services to rural areas. Here, we focus on unraveling the mechanisms underpinning spatial variation in forest leaf area index. Forest leaf area index can be used as an environmental indicator that controls key forest functions underlying environmental services and is also expected to respond to land use change. Specifically, we use Structural Equation Modelling to determine the direct and indirect pathways that link environmental drivers to canopy leaf area index (LAI) variation across forest types in the Atlantic Forest in Southern Brazil. We sampled 240 sample units (each 4000 m2), from a systematic and permanent forest inventory set which covers the State of Santa Catarina in a 10 km × 10 km grid, using hemispherical photographs. Environmental variables were extracted for each sample unit, including climatic and topographic data as well as indicators of anthropogenic pressure. Our results showed that forest types differed in their leaf area index (but not all of them) and that forest canopies show complex responses to environmental drivers, encompassing direct and indirect pathways. A major pathway was the positive effect of ‘Distance to city’ on the ‘Percentage of cropland in the matrix’. This led to a decline in the distance of the sample unit to the forest edge, indirectly reducing LAI, presumably because of elevated tree mortality at the forest edge. ‘Terrain steepness’ and ‘Rainfall in the driest month’ independently affected the ‘Percentage of cropland in the matrix’ and the ‘Distance to forest edge’. Halting forest fragmentation and increasing fragment size by landscape planning will mitigate these anthropogenic LAI declines. This can be achieved with a combination of legal and market mechanisms, like enforcement of the Brazilian Forest Act regulation on buffer zones around water bodies and steep slopes, landscape planning, and payment for environmental services to compensate the farmers for maintaining forest cover on otherwise productive land. © 2020 Elsevier B.V.
英文关键词	Hemispherical photograph; Leaf area index; National forest inventory; Structural equation model
语种	英语
scopus关键词	Biodiversity; Deforestation; Ecosystems; Land use; Tropics; Anthropogenic pressures; Environmental indicators; Environmental services; Environmental variables; Hemispherical photographs; Payment for environmental services; Structural equation modelling; Subtropical Atlantic forests; Environmental regulations; anthropogenic effect; biodiversity; forest cover; forest ecosystem; forest edge; forest inventory; fragmentation; landscape planning; leaf area index; mortality; rural area; spatial variation; Biodiversity; Deforestation; Ecosystems; Environmental Regulations; Land Use; Tropics; Atlantic Forest; Brazil; Santa Catarina
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154997
作者单位	Environmental Engineering Graduate Program, Regional University of Blumenau, Blumenau, São Paulo St., 89030-080, Brazil; School of Natural and Environmental Sciences, Modelling, Evidence and Policy Group, Newcastle University, Newcastle Upon Tyne, NE1 7RU, United Kingdom
推荐引用方式 GB/T 7714	da Silva D.A.,Pfeifer M.,Pattison Z.,et al. Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests[J],2020,476.
APA	da Silva D.A.,Pfeifer M.,Pattison Z.,&Vibrans A.C..(2020).Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests.Forest Ecology and Management,476.
MLA	da Silva D.A.,et al."Drivers of leaf area index variation in Brazilian Subtropical Atlantic Forests".Forest Ecology and Management 476(2020).