数字农科院2.0

An integrated belowground trait-based understanding of nitrogen-driven plant diversity loss

文献类型： 外文期刊

作者： Tian, Qiuying;Lu, Peng;Zhai, Xiufeng;Zhang, Ruifang;Zheng, Yao;Wang, Hong;Nie, Bao;Bai, Wenming;Niu, Shuli;Shi, Peili;Yang, Yuanhe;Li, Kaihui;Yang, Dianlin;Stevens, Carly;Lambers, Hans;Zhang, Wen-Hao

作者机构：

关键词： belowground trait;competitive exclusion;environmental tolerance;grassland ecosystem;N deposition;plant diversity loss;rhizosphere microhabitat

期刊名称： GLOBAL CHANGE BIOLOGY

ISSN： 1354-1013

年卷期： 2022 年

页码：

收录情况： SCIE（2022版）

摘要： Belowground plant traits play important roles in plant diversity loss driven by atmospheric nitrogen (N) deposition. However, the way N enrichment shapes plant microhabitats by patterning belowground traits and finally determines aboveground responses is poorly understood. Here, we investigated the rhizosheath trait of 74 plant species in seven N-addition simulation experiments across multiple grassland ecosystems in China. We found that rhizosheath formation differed among plant functional groups and contributed to changes in plant community composition induced by N enrichment. Compared with forb species, grass and sedge species exhibited distinct rhizosheaths; moreover, grasses and sedges expanded their rhizosheaths with increasing N-addition rate which allowed them to colonize belowground habitats. Grasses also shaped a different microenvironment around their roots compared with forbs by affecting the physicochemical, biological, and stress-avoiding properties of their rhizosphere soil. Rhizosheaths act as a biofilm-like shield by the accumulation of protective compounds, carboxylic anions and polysaccharides, determined by both plants and microorganisms. This enhanced the tolerance of grasses and sedges to stresses induced by N enrichment. Conversely, forbs lacked the protective rhizosheaths which renders their roots sensitive to stresses induced by N enrichment, thus contributing to their disappearance under N-enriched conditions. This study uncovers the processes by which belowground facilitation and trait matching affect aboveground responses under conditions of N enrichment, which advances our mechanistic understanding of the contribution of competitive exclusion and environmental tolerance to plant diversity loss caused by N deposition.

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