数字农科院2.0

Greater impacts of reduced than oxidized nitrogen enrichment on plant diversity losses in a temperate grassland

文献类型： 外文期刊

作者： Suxian Ren;Tianci Huo;Xin Jing;Weixing Liu;Xiaowei Gou;Xun Sun;Ru Hou;Junyi Liang

作者机构：

关键词： Acidification;Light asymmetry;Metal toxicity;NH4+ toxicity;Nitrogen deposition;Nitrogen form;Plant diversity

期刊名称： Ecological Processes

ISSN： 2192-1709

年卷期： 2025 年 14 卷 1 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版）

摘要： Background: Increasing atmospheric nitrogen (N) deposition is a major threat to plant diversity globally. Recent observations show that the reduced-to-oxidized (NHx/NOy) ratio of N deposition has been changing spatially and temporally. How and to what extent different N forms (i.e., NHx and NOy) influence grassland plant species loss are still unclear. Methods: We employed a field manipulative experiment by using three N forms [i.e., Ca(NO3)2, NH4NO3, and (NH4)2SO4] with six N addition levels (0, 4, 8, 16, 24, 32 g N m−2 year−1) in a temperate grassland and conducted a greenhouse experiment culturing four plant species corresponding different plant functional groups under Ca(NO3)2 or (NH4)2SO4 addition. Results: Results from our field experiment showed that the plant species loss rate was greater under NH4+–N than NO3−–N enrichment. Plant species loss was driven by light asymmetry under NO3−–N enrichment, while it was co-driven by light asymmetry and soil acidification under NH4NO3 enrichment. Under NH4+–N enrichment, light asymmetry, pH decrease, NH4+ toxicity, and metal toxicity jointly affected species loss. The greenhouse experiment provided direct evidence that legumes and forbs are more physiologically susceptible to NH4+-induced toxicity than grasses. Conclusions: Our results emphasize that N forms play a vital role in affecting grassland plant diversity. This suggests that regions with higher NHx enrichment may experience more severe plant diversity losses as N deposition continues to increase. Therefore, appropriate measures should be adopted to mitigate species losses.

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