Soil pH correlates with the co-occurrence and assemblage process of diazotrophic communities in rhizosphere and bulk soils of wheat fields
Soil pH correlates with the co-occurrence and assemblage process of diazotrophic communities in rhizosphere and bulk soils of wheat fields
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DOI：
10.1016/j.soilbio.2018.03.017
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发表时间：
2018-06-01
影响因子：
9.7
通讯作者：
Chu, Haiyan
中科院分区：
文献类型：
--
作者：
Fan, Kunkun;Weisenhorn, Pamela;Chu, Haiyan
生物固氮作用有助于增加土壤和根际植物有效氮库。本文研究了麦田根际和非根际土壤中固氮菌群落成员的共联结和聚集过程。根际固氮菌群落结构与非根际有显著差异，表现为竞争性较弱、网络结构较稳定的特点。确定性与随机的社区组合过程进行了量化使用betaNTl分数，表明确定性过程的重要性随着距离植物根系。土壤pH值与固氮菌群落结构和多样性相关，中性土壤中固氮菌群落结构的连通性和稳定性高于酸性或碱性土壤。中性土壤中固氮菌群落的组成以随机过程为主，而酸性或碱性土壤中固氮菌群落的组成以确定性过程为主。这些结果表明，土壤pH值可能在固氮菌群落的相互作用和聚集过程中起重要作用，这将有助于我们对农业土壤生物固氮作用的理解。
Biological nitrogen fixation contributes to the pool of plant-available N in both bulk soil and the rhizosphere. Here we investigated the co-association and assemblage process of diazotrophic community members in both rhizosphere and bulk soil of wheat fields. The diazotrophic community structure in the rhizosphere was significantly different and comprised a less competitive and more stable network structure when compared with that of the bulk soil. Deterministic versus stochastic community assemblage processes were quantified using betaNTl scores, demonstrating that deterministic processes decreased in importance with distance from plant roots. Soil pH was correlated with diazotrophic community structure and diversity, and community structure showed greater connectivity and stability in soils with neutral pH relative to those in acidic or alkaline soils. Stochastic processes dominated the assemblage of the diazotrophic community in soils with neutral pH, while deterministic processes dominated in acidic or alkaline soils. These results suggest that soil pH may play an essential role in the interaction and assemblage processes of the diazotrophic community in the rhizosphere and bulk soils, which could enhance our understanding of biological nitrogen fixation in agricultural soils.