Tianyuan Tan, Huamei Xia, Cong He, Yao Wei, Xiang Liu, Zhenhua Zhang, Jin-Sheng He, Lin Jiang
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引用次数: 0
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.
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.