Trait-Mediated Competition for Light Underpins Plant Diversity Loss Under Eutrophication

IF 12 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Tianyuan Tan, Huamei Xia, Cong He, Yao Wei, Xiang Liu, Zhenhua Zhang, Jin-Sheng He, Lin Jiang
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Abstract

Eutrophication is a major driver of plant diversity loss, yet the underlying mechanisms remain poorly understood. In particular, the role of eutrophication-induced light limitation in regulating plant diversity in natural communities has rarely been examined directly. Here we show that experimental light addition to the understory of a natural alpine grassland consistently restored lost diversity under different nutrient enrichment regimes. Under nitrogen enrichment, light addition recovered diversity primarily by promoting species gains, whereas under phosphorus enrichment, it primarily reduced species losses. When both nitrogen and phosphorus were enriched, light addition simultaneously increased species gains and reduced losses. These effects were primarily driven by shifts in the colonization and extinction of species with resource-acquisitive strategies (i.e., those with high specific leaf area and low leaf dry matter content), emphasizing the critical role of trait-mediated competition for light in biodiversity loss. Our findings point to light competition as a key driver of eutrophication-induced plant diversity loss, suggesting that managing light availability could help mitigate these losses in natural ecosystems.

Abstract Image

性状介导的光竞争是富营养化条件下植物多样性丧失的基础
富营养化是植物多样性丧失的主要驱动因素,但其潜在机制尚不清楚。特别是,富营养化诱导的光限制在调节自然群落植物多样性中的作用很少被直接研究。本研究表明,在不同的营养富集制度下,天然高寒草地的林下植物多样性得到了持续的恢复。在富氮条件下,轻添加主要通过促进物种增加来恢复多样性,而在富磷条件下,轻添加主要通过减少物种损失来恢复多样性。当氮和磷都富集时,轻添加同时增加了物种增益并减少了物种损失。这些影响主要是由具有资源获取策略的物种(即具有高比叶面积和低叶干物质含量的物种)的定植和灭绝的变化所驱动的,强调了性状介导的光竞争在生物多样性丧失中的关键作用。我们的研究结果表明,光竞争是富营养化引起的植物多样性丧失的关键驱动因素,这表明管理光可用性有助于减轻自然生态系统中的这些损失。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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