Long-term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland,Global Change Biology

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Long-term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland
Global Change Biology ( IF 10.8 ) Pub Date : 2021-05-16 , DOI: 10.1111/gcb.15681
Weixing Liu _{1,

2} , Lingli Liu _{1,

3} , Xian Yang ₂ , Meifeng Deng ₁ , Zhou Wang _{3,

4} , Pandeng Wang ₅ , Sen Yang _{1,

3} , Ping Li ₁ , Ziyang Peng _{1,

3} , Lu Yang _{1,

3} , Lin Jiang ₂

Affiliation

Anthropogenic nitrogen (N) input is known to alter plant and microbial α-diversity, but how N enrichment influences β-diversity of plant and microbial communities remains poorly understood. Using a long-term multilevel N addition experiment in a temperate steppe, we show that plant, soil bacterial and fungal communities exhibited different responses in their β-diversity to N input. Plant β-diversity decreased linearly as N addition increased, as a result of increased directional environmental filtering, where soil environmental properties largely explained variation in plant β-diversity. Soil bacterial β-diversity first increased then decreased with increasing N input, which was best explained by corresponding changes in soil environmental heterogeneity. Soil fungal β-diversity, however, remained largely unchanged across the N gradient, with plant β-diversity, soil environmental properties, and heterogeneity together explaining an insignificant fraction of variation in fungal β-diversity, reflecting the importance of stochastic community assembly. Our study demonstrates the divergent effect of N enrichment on the assembly of plant, soil bacterial and fungal communities, emphasizing the need to examine closely associated fundamental components (i.e., plants and microorganisms) of ecosystems to gain a more complete understanding of ecological consequences of anthropogenic N enrichment.

中文翻译：

长期氮输入改变植物和土壤细菌，但不会改变半干旱草原中的真菌β多样性

已知人为氮 (N) 输入会改变植物和微生物的 α 多样性，但氮富集如何影响植物和微生物群落的 β 多样性仍知之甚少。在温带草原中使用长期多级 N 添加实验，我们表明植物、土壤细菌和真菌群落对 N 输入的 β 多样性表现出不同的响应。由于定向环境过滤的增加，植物β-多样性随着氮添加量的增加而线性下降，其中土壤环境特性在很大程度上解释了植物β-多样性的变化。土壤细菌β多样性随着氮输入的增加先增加后减少，这最好用土壤环境异质性的相应变化来解释。然而，土壤真菌 β 多样性在整个 N 梯度上基本保持不变，植物 β 多样性、土壤环境特性和异质性共同解释了真菌 β 多样性变化的微小部分，反映了随机群落组装的重要性。我们的研究证明了 N 富集对植物、土壤细菌和真菌群落的组装的不同影响，强调需要检查生态系统中密切相关的基本组成部分（即植物和微生物），以更全面地了解人为造成的生态后果。 N 富集。

更新日期：2021-07-13

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