The Driving Factors of Subtropical Mature Forest Productivity: Stand Structure Matters

编号 010030304

推送时间 20210809

研究领域 森林生态 

年份 2021 

类型 期刊 

语种 英语

标题 The Driving Factors of Subtropical Mature Forest Productivity: Stand Structure Matters

来源期刊 forest

期 第303期

发表时间 20210728

关键词 species diversity;  stand structure;  tree size diversity;  initial above-ground biomass;  forest productivity;  niche complementarity hypothesis;  selection effect hypothesis; 

摘要 Forest productivity (increment of above-ground biomass) is determined by biodiversity but also by stand structure attributes. However, the relative strengths of these drivers in determining productivity remain controversial in subtropical forests. In this study, we analyzed a tree growth data from 500 plots with in a 20 ha mature subtropical forest in eastern China. We used spatial simultaneous autoregressive error models to examine the effects of diversity variables (species richness, evenness, and composition), stand structural attributes (stand density, tree size range and diversity), environmental factors (topography and soil), and initial above-ground biomass (AGB) on productivity. We also applied structural equation models to quantify the relative importance of diversity, stand structure, environmental factors, and initial AGB in determining forest productivity. Our results showed that stand structure together with diversity and initial AGB governed forest productivity. Tree size diversity (DBH Shannon’s diversity index) had the largest positive effect on forest productivity. These results provide new evidence that structural explanatory variables have greater contributions to productivity for mature subtropical forests, strongly supporting the niche complementarity hypothesis. Our work highlights the importance of tree size diversity in promoting high forest productivity, and suggests that regulating and conserving complexity of forest stand structure should be among the most important goals in subtropical forest management. View Full-Text

服务人员 王璐

服务院士 蒋有绪

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