Characterizing changes in soil bacterial community structure in response to short-term warming.
Characterizing changes in soil bacterial community structure in response to short-term warming.
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DOI：
10.1111/1574-6941.12289
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发表时间：
2014-08
影响因子：
4.2
通讯作者：
J. Xiong;Huaibo Sun;F. Peng;Huayong Zhang;X. Xue;S. Gibbons;J. Gilbert;H. Chu
中科院分区：
文献类型：
--
作者：
J. Xiong;Huaibo Sun;F. Peng;Huayong Zhang;X. Xue;S. Gibbons;J. Gilbert;H. Chu
高海拔高山草甸正在经历土壤表面温度的显著高于平均水平的上升，这可能是持续气候变化的结果。变暖对植物生产力和土壤土壤变量的影响已经建立，但变暖对土壤微生物群落结构的影响还没有得到很好的表征。在这里，15个月的土壤变暖（+1和+2 °C）对细菌群落结构的影响，在青藏高原高寒草甸的田间实验中使用条形码焦磷酸测序进行了检查。升温显著改变了土壤细菌群落结构（P < 0.05），但对α多样性影响不显著。放线菌和Alphaproteobacteria丰度的变化被认为是环境（AT）和人工加温条件之间差异的最大原因。方差分配分析（VPA）表明，变暖直接解释了7.15%的细菌群落结构的变化，而变暖引起的土壤和植物表型特性的变化，间接解释了28.3%和20.6%的社区变异，分别。有趣的是，某些分类群对两种升温处理的反应不一致，例如δ变形菌在+1 °C时相对丰度下降，但在+2 °C时恢复到AT对照相对丰度。这表明复杂的微生物动力学可能是由细菌类群之间的条件依赖性引起的。
High altitude alpine meadows are experiencing considerably greater than average increases in soil surface temperature, potentially as a result of ongoing climate change. The effects of warming on plant productivity and soil edaphic variables have been established previously, but the influence of warming on soil microbial community structure has not been well characterized. Here, the impact of 15 months of soil warming (both +1 and +2 °C) on bacterial community structure was examined in a field experiment on a Tibetan plateau alpine meadow using bar-coded pyrosequencing. Warming significantly changed (P < 0.05) the structure of the soil bacterial community, but the alpha diversity was not dramatically affected. Changes in the abundance of the Actinobacteria and Alphaproteobacteria were found to contribute the most to differences between ambient (AT) and artificially warmed conditions. A variance partitioning analysis (VPA) showed that warming directly explained 7.15% variation in bacterial community structure, while warming-induced changes in soil edaphic and plant phenotypic properties indirectly accounted for 28.3% and 20.6% of the community variance, respectively. Interestingly, certain taxa showed an inconsistent response to the two warming treatments, for example Deltaproteobacteria showed a decreased relative abundance at +1 °C, but a return to AT control relative abundance at +2 °C. This suggests complex microbial dynamics that could result from conditional dependencies between bacterial taxa.