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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Soil prokaryotic community structure and co-occurrence patterns on the fragmented Chinese Loess Plateau: Effects of topographic units of a soil eroding catena
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Soil prokaryotic community structure and co-occurrence patterns on the fragmented Chinese Loess Plateau: Effects of topographic units of a soil eroding catena

机译：土壤原核群落结构与碎片化黄土高原的共同发生模式：土壤侵蚀卡特纳的地形单位的影响

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摘要

Soil prokaryotes composition and diversity are the key to uncovering the mechanisms that drive variations in soil biogeochemical processes. Soil erosion is a primary factor that affects the spatial distribution of the soil prokaryotic community, but how soil prokaryotes in soil-eroding catena respond to environmental factors related to topography remains largely unclear. In this study, topsoils were sampled from three typical erosion geomorphic units (autonomous, transitional and depositional zones) in 2018 to identify the soil prokaryotic community and interactions among the species on the Chinese Loess Plateau. The alpha-diversity was greater but the betadiversity was lower in the autonomous and transitional zones than in the depositional zone. Gammaproteobacteria and Bacteroidetes were 73% and 68% lower in the autonomous and transitional zones than in the depositional zone. In addition, Deltaproteobacteria, Acidobacteria, Firmicutes, Actinobacteria, Chloroflexi, Gemmatimonadetes and Nitrospirae were significantly higher in the autonomous and transitional zones. A less clustered network and fewer co-occurrences within the prokaryotic community and functional groups of processes were found in the depositional zone than in the autonomous and transitional zones. The alpha-diversity index was significantly negatively correlated with clay particles, soil water content, soil organic carbon (SOC), and ratio of SOC and nitrogen (C/N) but positively correlated with total nitrogen (TN). The higher relative abundances of copiotrophic groups (including Gammaproteobacteria, Bacteroidetes, etc.) in the depositional zone was mainly due to the increased SOC caused by the deposition of SOC-rich clay. Reassembly of the soil physico-chemistry characteristics among the topographic units significantly altered the soil prokaryotic community along the soil-eroding catena.
机译：土壤原核生物的组成和多样性是揭示驱动土壤生物地球化学过程变化机制的关键。土壤侵蚀是影响土壤原核生物群落空间分布的主要因素，但土壤侵蚀链中的土壤原核生物如何响应与地形相关的环境因素仍不清楚。在本研究中，2018年从三个典型的侵蚀地貌单元（自治区、过渡区和沉积区）采集表层土壤样本，以确定中国黄土高原土壤原核生物群落和物种间的相互作用。与沉积带相比，自治带和过渡带的α多样性更大，但β多样性更低。在自治区和过渡区，Gammaproteobacteria和拟杆菌分别比沉积区低73%和68%。此外，在自治区和过渡区，Deltaproteobacteria、Acidobacteria、Firmicutes、Actinobacteria、Chloroflexi、gemmatimonades和Nitrospirae的数量显著增加。与自治区和过渡区相比，沉积区的原核生物群落和过程功能群内的聚集网络较少，共现现象也较少。α多样性指数与粘粒、土壤含水量、土壤有机碳（SOC）、土壤有机碳与氮比值（C/N）呈显著负相关，与全氮（TN）呈显著正相关。沉积带中副营养菌群（包括Gammaproteobacteria、拟杆菌等）的相对丰度较高，主要是由于富SOC粘土的沉积导致SOC增加。地形单元间土壤理化特性的重组显著改变了土壤侵蚀链沿线的土壤原核生物群落。

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