数字农科院2.0

Subordinate tree species diversity explains carbon stock better than dominant tree diversity after decades of forest rewilding

文献类型： 外文期刊

作者： Zhai, Kaiyan;Yin, Pan;Revillini, Daniel;Chen, Xinli;Liu, Shengen;Lou, Yilai;Zhang, Weidong;Wang, Silong;Zhou, Guiyao;Delgado-Baquerizo, Manuel

作者机构：

关键词： biodiversity-ecosystem functioning;carbon stock;climate change;ecosystem services;forest restoration;plant biodiversity;subtropical forest

期刊名称： JOURNAL OF APPLIED ECOLOGY

ISSN： 0021-8901

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Forest rewilding is expected to help support nature restoration and mitigate climate change by promoting soil carbon (C) stocks. Increases in biodiversity after decades of rewilding may affect forest soil C stocks; however, the relative contribution of subordinate and dominant tree species diversity to soil C stocks after decades of forest rewilding remains poorly understood. Here, we conducted a standardized field survey to investigate how subordinate (i.e. rarer) and dominant (i.e. more common) tree species diversity (determined based on basal area) correlate with multiple aspects of soil C stocks (i.e. total soil C stock, dissolved organic C, microbial residue C, and microbial respiration) after 31 years of the establishment of a forest plantation in a subtropical ecosystem. We found that both subordinate and dominant tree species diversity were positively correlated with soil C stock, dissolved organic C, microbial residue C, and microbial respiration. Meanwhile, tree functional traits (e.g. the proportion of N-fixing taxa) among subordinate species were positively correlated with bacterial residue C. Strikingly, subordinate tree species diversity explained a larger portion of variation in soil C stock compared with the diversity of dominant tree species. Structural equation model (SEM) further suggested that subordinate plant biodiversity influenced soil C stocks via its influence on plant traits. Synthesis and applications. Our work provides new insights on the crucial role of subordinate tree species diversity in supporting C stocks after decades-long rewilding of a subtropical forest. Therefore, the preservation of the rarer subordinate plant species is fundamental to develop sustainable forest management strategies, and for policymakers to promote climate change mitigating ecosystem services.

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