Bacterial community dissimilarity between the surface and subsurface soils equals horizontal differences over several kilometers in the western Tibetan Plateau
Bacterial community dissimilarity between the surface and subsurface soils equals horizontal differences over several kilometers in the western Tibetan Plateau
复制标题
青藏高原西部表层和地下土壤细菌群落差异相当于数公里水平差异
DOI：
10.1111/1462-2920.13236
复制
发表时间：
2016-05-01
影响因子：
5.1
通讯作者：
Shi, Yu
中科院分区：
文献类型：
--
作者：
Chu, Haiyan;Sun, Huaibo;Shi, Yu
许多研究调查了近地表土壤微生物群落在大空间尺度上的模式。然而，对地下（15-30厘米深）微生物群落的变化知之甚少。本文研究了西藏高海拔土壤微生物群落的深度剖面。在近表层中，酸性细菌、绿球藻和α-变形菌的相对丰度较高，而在次表层中，放线菌、芽单胞菌和β-变形菌的相对丰度较高。土壤表层和亚表层微生物群落结构不同，与土壤总碳（TC）和碳氮比（C/N）变化密切相关。各层之间微生物群落的差异与相隔数公里的地点之间的水平差异大致相同。总的来说，我们发现TC和C/N是表面和地下微生物群落分布的最佳预测因子。距离和环境变量对群落组成的相对贡献的探索表明，当代环境是该地区微生物分布的主要驱动力。由于生态位保守性的影响，土壤微生物群落在各土层中的聚集性比随机聚集性更强，且表层土壤样品比亚表层土壤样品更容易聚集。
Many studies have investigated patterns in the near-surface soil microbial community over large spatial scales. However, less is known about variation in subsurface (15-30 cm of depth) microbial communities. Here we studied depth profiles of microbial communities in high-elevation soils from Tibet. The relative abundance of Acidobacteria, Chloroflexi and Alphaproteobacteria was higher in near-surface layers, while the relative abundance of Actinobacteria, Gemmatimonadetes and Betaproteobacteria was higher in the subsurface samples. The microbial community structure was distinct between the surface and subsurface soil layers, strongly correlating with variation in total carbon (TC) and carbon to nitrogen ratio (C/N). The differences in the microbial community between the layers were about the same as the horizontal differences between sites separated by many kilometers. Overall, we found that TC and C/N were the best predictors for both surface and subsurface microbial community distribution. Exploration of the relative contribution of distance and environmental variables to community composition suggests that the contemporary environment is the primary driver of microbial distribution in this region. Reflecting niche conservatism in evolution, the microbial communities in each soil site and layer tended to be more phylogenetically clustered than expected by chance, and surface soil layer samples were more likely to be clustered than subsurface samples.