Microtopography mediates the community assembly of soil prokaryotes on the local-site scale

生物扩散 群落结构 生态学 非生物成分 微生物种群生物学 生态系统 土壤科学 相对物种丰度 土壤水分 丰度(生态学) 环境科学 生物 人口 社会学 人口学 遗传学 细菌
作者
Weiming Lv,Yali Liu,Jianqing Du,Tang Li,Biao Zhang,Qiang Liu,Xiaoyong Cui,Kai Xue,Yanfen Wang
出处
期刊:Catena [Elsevier BV]
卷期号:222: 106815-106815 被引量:1
标识
DOI:10.1016/j.catena.2022.106815
摘要

Microbial community assembly is a central topic in soil microbiology and remains controversial at small scales. Microtopography, a common feature of terrestrial ecosystems, strongly affects energy, water, and nutrient cycling at local-site scale; however, its influence on the community assembly of soil microbes has rarely been explored. Here, we investigated how different microtopographic types (depressions, gentle and steep slopes, and gullies) and slope positions (upstream, middle, and downstream) mediate the community assembly of soil prokaryotes on a local-site scale. Our results showed that α-diversity significantly differed across microtopographic types, being highest on the gentle slope and lowest in the gully. The relative abundance of 30% dominant phyla as well as the prokaryotic community composition were also significantly affected by microtopography. Notably, the relative abundance of Bacteroidetes, an easy-dispersal phylum, increased from upstream to downstream. Further analyses showed that although stochastic processes (mainly homogenizing dispersal) dominated the community assembly, abiotic environmental filtering (mainly imposed by soil moisture and total phosphorus) could still explain 27.4–28.8% of the total variations in the soil prokaryotic community. These results suggested that microtopography shapes the diversity, community composition, and assembly of soil prokaryotes at local-site scale via two pathways: direct influence through prokaryotic dispersal and indirect influence through the re-allocation of soil water and phosphorus. Our findings provide novel insights into the local controls over community assembly of soil microbes. It emphasises the importance of focusing on the microtopography-derived heterogeneity in soil microbial functions when applying microtopographic modifications to ecological restoration in the future.
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