Variations of Soil Microbial Community Structures Beneath Broadleaved Forest Trees in Temperate and Subtropical Climate Zones.
Variations of Soil Microbial Community Structures Beneath Broadleaved Forest Trees in Temperate and Subtropical Climate Zones.
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温带、亚热带阔叶林下土壤微生物群落结构变化
DOI：
10.3389/fmicb.2017.00200
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发表时间：
2017
影响因子：
5.2
通讯作者：
Yang Y
中科院分区：
文献类型：
--
作者：
Yang S;Zhang Y;Cong J;Wang M;Zhao M;Lu H;Xie C;Yang C;Yuan T;Li D;Zhou J;Gu B;Yang Y
全球变暖已使气候带向极地或向上移动。然而，微生物群落的高度复杂性给理解与自然气候带演替相关的微生物群落结构和功能的响应和机制带来了挑战。在这里，我们检查了乌鹿山（WLM，温带气候）、伏牛山（FNM，温带和亚热带气候区交界处）和神农架山（SNJ，亚热带气候）三个阔叶林的土壤微生物群落。尽管植物物种丰富度随着纬度的升高而降低，但微生物分类的α多样性随着纬度的升高而增加，同时土壤总含量以及速效氮和磷含量也随之增加。系统发育 NRI（净相关指数）值从温带 (WLM) 的 -0.718 增加到亚热带 (SNJ) 的 1.042，显示出从过度分散到聚类的转变，可能是由环境过滤（例如低 pH 值和营养物质）引起的。同样，亚热带森林样本基于分类的关联网络更大、更紧密，表明存在聚类。相比之下，三个森林的功能α多样性相似，但FNM森林的功能基因网络与其他森林显着不同（P < 0.050）。仅在 FNM 森林中观察到分类和功能 β 多样性之间存在显着相关性（R = 0.616，P < 0.001），这表明气候带边界的功能冗余度较低。采用时空替代策略，我们预测向极地气候变化将导致阔叶林微生物分类学α多样性减少。
Global warming has shifted climate zones poleward or upward. However, understanding the responses and mechanism of microbial community structure and functions relevant to natural climate zone succession is challenged by the high complexity of microbial communities. Here, we examined soil microbial community in three broadleaved forests located in the Wulu Mountain (WLM, temperate climate), Funiu Mountain (FNM, at the border of temperate and subtropical climate zones), or Shennongjia Mountain (SNJ, subtropical climate). Although plant species richness decreased with latitudes, the microbial taxonomic α-diversity increased with latitudes, concomitant with increases in soil total and available nitrogen and phosphorus contents. Phylogenetic NRI (Net Relatedness Index) values increased from -0.718 in temperate zone (WLM) to 1.042 in subtropical zone (SNJ), showing a shift from over dispersion to clustering likely caused by environmental filtering such as low pH and nutrients. Similarly, taxonomy-based association networks of subtropical forest samples were larger and tighter, suggesting clustering. In contrast, functional α-diversity was similar among three forests, but functional gene networks of the FNM forest significantly (P < 0.050) differed from the others. A significant correlation (R = 0.616, P < 0.001) between taxonomic and functional β-diversity was observed only in the FNM forest, suggesting low functional redundancy at the border of climate zones. Using a strategy of space-for-time substitution, we predict that poleward climate range shift will lead to decreased microbial taxonomic α-diversities in broadleaved forest.