Soil pH is a major driver of soil diazotrophic community assembly in Qinghai-Tibet alpine meadows
Soil pH is a major driver of soil diazotrophic community assembly in Qinghai-Tibet alpine meadows
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土壤pH是青藏高寒草甸土壤固氮群落聚集的主要驱动因素
DOI：
10.1016/j.soilbio.2017.09.024
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发表时间：
2017
影响因子：
9.7
通讯作者：
Minjie Yao
中科院分区：
文献类型：
--
作者：
Yansu Wang;Chaonan Li;Yongping Kou;Jianjun Wang;Bo Tu;Huan Li;Xiangzhen Li;Changting Wang;Minjie Yao
生物氮输入是天然草地生态系统养分富集的必要条件。这个过程是由固氮微生物进行的。然而，草地土壤中固氮菌群落的格局和组装过程还不完全清楚，特别是在高海拔的青藏高原（QTP）高寒草甸（QTP）。以青藏高原高寒草甸为研究对象，研究了土壤固氮生物群落的多样性格局和群落组装过程。结果表明，不同固氮菌类群对pH值的响应不同，α多样性随pH值的增加而线性增加。土壤pH值的增加促进了固氮菌群落的周转，而且对年平均温度也表现出强烈的响应。模型分析表明，确定性过程是最重要的形成系统发育的群落结构和组装的固氮生物。各采样点的重氮营养群落均表现出明显的聚集性，高pH（pH7.00 ~ 8.00）土壤重氮营养群落的聚集性大于低pH（pH5.02 ~ 7.00）土壤重氮营养群落。土壤pH值是一个主要的驱动器在结构化土壤固氮群落组装通过调节确定性和随机过程的相对重要性在QTP高寒草甸。
The biological nitrogen input is essential for nutrient enrichment in natural grassland ecosystems. This process is carried out by diazotrophic microbes. However, the patterns and assembly processes of diazotrophic communities in grassland soil are not fully understood, especially in alpine meadows of high-altitude Qinghai-Tibet Plateau (QTP). In this study, the diversity patterns and community assembly processes of soil diazotrophic communities were investigated in QTP alpine meadows. The results showed that different diazotrophic taxa responded differentially to the increase of soil pH, and α-diversity increased linearly with pH values. Diazotrophic community turnover was enhanced by the increased variation in soil pH, moreover, it also showed strong response to mean annual temperature. Null model analysis showed that deterministic processes were most important in shaping the phylogenetic community structure and assembly of diazotrophs. Diazotrophic communities of each sampling site tended to be phylogenetically clustered, while communities at high pH soils (pH 7.00 to 8.00) showed more clustering than those of low pH (pH 5.02 to 7.00). The soil pH is a main driver in structuring soil diazotrophic community assembly by regulating the relative importance of deterministic and stochastic processes in QTP alpine meadows.