Distinct assembly mechanisms underlie similar biogeographical patterns of rare and abundant bacteria in Tibetan Plateau grassland soils
Distinct assembly mechanisms underlie similar biogeographical patterns of rare and abundant bacteria in Tibetan Plateau grassland soils
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DOI：
10.1111/1462-2920.14993
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发表时间：
2020-04-02
影响因子：
5.1
通讯作者：
Ferrari, Belinda C.
中科院分区：
文献类型：
--
作者：
Ji, Mukan;Kong, Weidong;Ferrari, Belinda C.
稀有生物圈代表了地球生物多样性的大部分，并发挥着重要的生态功能，但人们对其在陆地生态系统中的地理分布模式和群落组装过程知之甚少。本文对青藏高原旱地草原土壤中稀有细菌（相对丰度为1%）的群落组成和发生规律进行了研究。结果表明，在组成和系统发育水平上，稀有和丰富的细菌的地理模式相似，但稀有亚群落的随机性（72%）比丰富（57%）的影响更大。环境因素对稀有细菌组成的影响（41%）小于丰富细菌（80%），而环境因素对稀有细菌组成的影响（36%）大于丰富细菌（29%）。地理距离和土壤、植被对稀有细菌的繁殖有相同的解释力（分别为11.5%和11.9%），而地理距离对丰富细菌的繁殖有更大的解释力（22.1%），而对地方性因素的解释力（11.3%）较小。此外，一个显着更紧密的联系之间的社区系统发育和组成中观察到罕见的（R-2 = 0.65）比丰富的细菌（R-2 = 0.08）。我们的研究为旱地土壤中稀有和丰富的细菌的组装过程和生物学模式提供了新的见解。
Rare biosphere represents the majority of Earth's biodiversity and performs vital ecological functions, yet little is known about its biogeographical patterns and community assembly processes in terrestrial ecosystems. Herein, we investigated the community composition and phylogeny of rare (relative abundance 1%) bacteria in dryland grassland soils on the Tibetan Plateau. Results revealed similar biogeographical patterns of rare and abundant bacteria at both compositional and phylogenetic levels, but rare subcommunity was more heavily influenced by stochasticity (72%) than the abundant (57%). The compositional variation of rare bacteria was less explained by environmental factors (41%) than that of the abundant (80%), while the phylogeny of rare bacteria (36%) was more explained than that of the abundant (29%). The phylogeny of rare bacteria was equally explained by local factors (soil and vegetation) and geospatial distance (11.5% and 11.9% respectively), while that of the abundant was more explained by geospatial distance (22.1%) than local factors (11.3%). Furthermore, a substantially tighter connection between the community phylogeny and composition was observed in rare (R-2 = 0.65) than in abundant bacteria (R-2 = 0.08). Our study provides novel insights into the assembly processes and biographical patterns of rare and abundant bacteria in dryland soils.