Biogeography and diversity patterns of abundant and rare bacterial communities in rice paddy soils across China
Biogeography and diversity patterns of abundant and rare bacterial communities in rice paddy soils across China
复制标题
DOI：
10.1016/j.scitotenv.2020.139116
复制
发表时间：
2020-08-15
影响因子：
9.8
通讯作者：
Christie, Peter
中科院分区：
文献类型：
--
作者：
Hou, Jinyu;Wu, Longhua;Christie, Peter
细菌是水生生态系统和陆地生态系统中的关键生态系统驱动因素。然而，我们对大空间尺度上生物多样性产生和维持机制的理解仍然有限，特别是涉及土壤生态系统中稀有类群的机制。本研究以中国水稻土为模式生态系统，研究了稀有和丰富细菌亚群落的生态多样性和组装机制。我们从中国19个省份的113个地点收集了339个水稻土样本，覆盖范围长达3869公里。通过16S rRNA基因的高通量测序来表征细菌群落。稀有亚群落和丰富亚群落的α多样性与土壤pH值呈二次相关关系，稀有亚群落的α多样性与土壤pH值呈二次相关关系，与丰富亚群落的α多样性相比，稀有亚群落的α多样性与土壤pH值呈二次相关关系。此外，确定性选择过程占主导地位的丰富的亚群落，而随机过程占主导地位的稀有亚群落的基础上的变异分配分析和系统发育零模型。土壤pH值也是主要的决定性因素驱动的地理分布的稀有和丰富的亚群落。此外，年平均温度和土壤质地也是影响丰富亚群落和稀有亚群落的地理分布和多样性格局的重要因子。这些结果表明，水稻土中丰富亚群落和稀有亚群落的多样性产生和维持机制是完全不同的，这表明这两个亚群落对未来环境变化的响应可能是不同的。(C)2020爱思唯尔B.V.保留所有权利。
Bacteria are critical ecosystem drivers in both aquatic and terrestrial ecosystems. However, our understanding of the mechanisms generating and maintaining biodiversity on large spatial scales remains limited, especially mechanisms involving rare taxa in soil ecosystems. In the present study we took paddy soils in China as model ecosystems and studied the ecological diversity and assembly mechanisms of both the rare and abundant bacterial subcommunities. We collected 339 paddy soil samples from 113 sites across 19 Chinese provinces that span distances of up to 3869 km. The bacterial community was characterized by high-throughput sequencing of the 16S rRNA gene. The a-diversity of rare and abundant subcommunities showed opposite quadratic correlations with the key environmental factor soil pH. Rare taxa exhibited a stronger distance-decay relationship than the abundant subcommunity. Moreover, deterministic selection processes dominated in the assembly of the abundant subcommunity while stochastic processes dominated in that of the rare subcommunity based on both variation partitioning analysis and the phylogenetic null model. Soil pH was also the main deterministic factor driving the geographical distributions of both the rare and abundant subcommunity. Besides, mean annul temperature and soil texture were also found to be important factors affecting the biogeography and diversity patterns of abundant and rare subcommunities. These results indicate that the mechanisms generating and maintaining the diversity of the abundant and rare subcommunities were totally different in paddy soils, suggesting that these two subcommunities may respond differently to future environmental change. (C) 2020 Elsevier B.V. All rights reserved.