Adaptation of Soil Fungal Community Structure and Assembly to Long- Versus Short-Term Nitrogen Addition in a Tropical Forest.
Adaptation of Soil Fungal Community Structure and Assembly to Long- Versus Short-Term Nitrogen Addition in a Tropical Forest.
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DOI：
10.3389/fmicb.2021.689674
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发表时间：
2021
影响因子：
5.2
通讯作者：
Shen W
中科院分区：
文献类型：
--
作者：
He J;Jiao S;Tan X;Wei H;Ma X;Nie Y;Liu J;Lu X;Mo J;Shen W
土壤真菌在生态系统过程中起着至关重要的作用，对全球变化非常敏感。大气氮(N)沉积增加对真菌多样性和群落组成的影响已经得到了很好的证明，但真菌群落集合如何响应试验性N添加的持续影响仍然知之甚少。本文旨在研究中国热带富氮森林在短期(2年)和长期(13年)外源氮素(∼，100kgN ha-1yr-1)处理下土壤真菌群落的变化和组装过程。我们观察到，短期施氮显著增加了真菌分类和系统发育的α多样性，并改变了真菌群落组成，其中子囊菌门的相对丰度显着增加，担子菌门的相对丰度显着降低。短期施氮还显著提高了腐生菌的相对丰度，降低了外生菌根真菌的相对丰度。但长期施氮对这些指标的影响不显著。真菌α多样性、群落组成、主要门、属和功能类群的相对丰富度的变化主要与土壤pH和NO3--N浓度有关，短期施氮的相关性明显强于长期施氮。零、中性群落模型和归一化随机性比(NST)指数的结果一致地表明，随机过程在热带森林土壤真菌群落的组装中起主导作用，短期施氮显著增加了随机过程的相对贡献。这些结果表明，真菌群落对氮素添加的反应是持续时间相关的，即真菌群落的结构和组装对短期氮素添加敏感，但对长期氮素积累具有适应性。
Soil fungi play critical roles in ecosystem processes and are sensitive to global changes. Elevated atmospheric nitrogen (N) deposition has been well documented to impact on fungal diversity and community composition, but how the fungal community assembly responds to the duration effects of experimental N addition remains poorly understood. Here, we aimed to investigate the soil fungal community variations and assembly processes under short- (2 years) versus long-term (13 years) exogenous N addition (∼100 kg N ha–1 yr–1) in a N-rich tropical forest of China. We observed that short-term N addition significantly increased fungal taxonomic and phylogenetic α-diversity and shifted fungal community composition with significant increases in the relative abundance of Ascomycota and decreases in that of Basidiomycota. Short-term N addition also significantly increased the relative abundance of saprotrophic fungi and decreased that of ectomycorrhizal fungi. However, unremarkable effects on these indices were found under long-term N addition. The variations of fungal α-diversity, community composition, and the relative abundance of major phyla, genera, and functional guilds were mainly correlated with soil pH and NO3––N concentration, and these correlations were much stronger under short-term than long-term N addition. The results of null, neutral community models and the normalized stochasticity ratio (NST) index consistently revealed that stochastic processes played predominant roles in the assembly of soil fungal community in the tropical forest, and the relative contribution of stochastic processes was significantly increased by short-term N addition. These findings highlighted that the responses of fungal community to N addition were duration-dependent, i.e., fungal community structure and assembly would be sensitive to short-term N addition but become adaptive to long-term N enrichment.
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影响因子：
2.9
作者：
Entwistle, Elizabeth M.;Zak, Donald R.;Edwards, Ivan P.
通讯作者：
Edwards, Ivan P.
影响因子：
2.9
作者：
Corrales, Adriana;Turner, Benjamin L.;Dalling, James W.
通讯作者：
Dalling, James W.
影响因子：
9.7
作者：
Freedman, Zachary B.;Romanowicz, Karl J.;Zak, Donald R.
通讯作者：
Zak, Donald R.
影响因子：
8.9
作者：
Du, Enzai;de Vries, Wim
通讯作者：
de Vries, Wim
影响因子：
64.8
作者：
GADGIL, RL;GADGIL, PD
通讯作者：
GADGIL, PD