Fungal community reveals less dispersal limitation and potentially more connected network than that of bacteria in bamboo forest soils
Fungal community reveals less dispersal limitation and potentially more connected network than that of bacteria in bamboo forest soils
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DOI：
10.1111/mec.14428
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发表时间：
2018-01
影响因子：
4.9
通讯作者：
Xian Xiao;Yuting Liang;Sai-xia Zhou;Shunyao Zhuang;Bo Sun
中科院分区：
文献类型：
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作者：
Xian Xiao;Yuting Liang;Sai-xia Zhou;Shunyao Zhuang;Bo Sun
本微生物生态学研究的一个中心目的是调查土壤微生物群落的组装形成机制。尽管细菌和真菌对森林生态系统碳循环的调节作用十分重要，但对其分布模式和潜在机制的了解仍然不足。在这里，土壤样品从六个竹林在中国南方毛竹的主要种植区。通过用Illumina MiSeq分别对16S rRNA和ITS基因扩增子进行测序来评估细菌和真菌的多样性。基于结构方程模型，扩散限制对细菌β多样性的影响最大，而年平均降水量的影响较小，直接或间接介导的土壤有机碳密度。然而，只有年平均温度和降水量对真菌β多样性起直接作用。此外，共现网络分析显示，真菌网络中的网络连接性可能比细菌高得多。真菌群落在竹林土壤碳代谢中具有更小的扩散限制、更强的环境选择性和潜在的更紧密的网络联系，因此真菌群落在竹林土壤碳代谢中发挥着更重要的作用。真菌β多样性和聚类系数分别解释了14.4%和6.1%的碳代谢谱的变异，但细菌仅分别解释了1.7%和1.8%。本研究探讨了土壤微生物的空间分布格局沿着与生态网络的扩散限制、选择和连接机制，从而为不同微生物类群的不同功能特性的研究提供了新的视角。
A central aim of this microbial ecology research was to investigate the mechanisms shaping the assembly of soil microbial communities. Despite the importance of bacterial and fungal mediation of carbon cycling in forest ecosystems, knowledge concerning their distribution patterns and underlying mechanisms remains insufficient. Here, soils were sampled from six bamboo forests across the main planting area of Moso bamboo in southern China. The bacterial and fungal diversities were assessed by sequencing 16S rRNA and ITS gene amplicons, respectively, with an Illumina MiSeq. Based on structural equation modelling, dispersal limitation had strongest impact on bacterial beta diversity, while the mean annual precipitation had a smaller impact by directly or indirectly mediating the soil organic carbon density. However, only the mean annual temperature and precipitation played direct roles in fungal beta diversity. Moreover, the co‐occurrence network analyses revealed a possibly much higher network connectivity in the fungal network than in the bacteria. With less dispersal limitation, stronger environmental selection and a potentially more connected network, the fungal community had more important roles in the soil carbon metabolisms in bamboo forests. Fungal beta diversity and the clustering coefficient explained approximately 14.4% and 6.1% of the variation in the carbon metabolic profiles among sites, respectively, but that of bacteria only explained approximately 1.7% and 1.8%, respectively. This study explored soil microbial spatial patterns along with the underlying mechanisms of dispersal limitation, selection and connectivity of ecological networks, thus providing novel insights into the study of the distinct functional traits of different microbial taxa.