Community-level leaf functional trait variation composition across three contrasting tree communities, Southwest China

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ID: 325023
2026
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Abstract
Abstract Intraspecific trait variation (ITV) is a critical mechanism for species adaptation to heterogeneous environments, yet its relative contribution and variation patterns across different ecosystems remain poorly understood. This study investigated 28 dominant species and 910 individuals in three climatically distinct ecosystems of Yunnan Province, China: tropical rainforest (Xishuangbanna), subtropical evergreen broad-leaved forest (Ailaoshan), and savanna (Yuanjiang). We measured leaf thickness (LT), leaf area (LA), specific leaf area (SLA), leaf dry matter content (LDMC), and leaf chlorophyll content (LCC), combining phylogenetic signal testing and variation partitioning to quantify the effects of site, species, and individual scales on leaf trait variation. We detected significant phylogenetic signals among those leaf traits. Plants in the tropical rainforest exhibited resource-acquisitive strategies (high LA and SLA, but low LDMC), whereas species in the subtropical evergreen broad-leaved forest and savanna showed more resource-conservative strategies. ITV accounted for 9%–47% of the total trait variation at the regional scale. At local scale, the relative contribution of ITV to total community trait variance was highest in the resource-rich forest and negligible in the savanna. Our findings demonstrate that the variance of functional traits is highly context-dependent and scale-dependent across ecosystems. Given that intraspecific variation contributes substantially to total community-level trait variance, explicitly incorporating ITV into predictive models is critical for accurately shifting our understanding from static trait means to dynamic mechanisms of community assembly and ecosystem responses to global climate change.
Reference Key
openalex_W7203495783 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yalan Wu, Xiaoyang Song, Shanshan Chen, Min Cao, Jie Yang
Journal journal of plant ecology
Year 2026
DOI
10.1093/jpe/rtag188
URL
https://doi.org/10.1093/jpe/rtag188
Keywords Keywords not found

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