Distribution Characteristics and Dynamics of Abundant and Rare Bacteria in Purple Soil of the Sichuan Basin

doi:10.11924/j.issn.1000-6850.casb2022-1001

Abstract

Abstract:

Soil microbial community is composed of a few abundant taxa and most rare taxa, and revealing the distribution characteristics and dynamic changes of abundant and rare bacteria is essential for understanding soil ecosystem. In this study, the purple soil of dryland was subjected to a 100-day incubation experiment with pig manure and chicken manure as the external source of organic fertilizer, and five sampling time points were designed to analyze the bacterial communities in the purple soil of no fertilizer control treatment (CK), pig manure application treatment (PMS) and chicken manure application treatment (CMS) by using high-throughput sequencing technology. The results showed that the number, taxa and α diversity index of rare bacteria were higher than those of abundant bacteria, indicating that the distribution composition of the two bacteria was different. The dynamic changes of abundant and rare bacterial community structure were similar, and the effects of pig manure application on microbial community structure were different from those of unfertilized and chicken manure treatments. Co-occurrence network analysis showed that the topological characteristics of rare bacteria were significantly higher than other groups, but a few abundant bacteria occupied the central nodes of the network. Condition rare and abundant taxa had high betweeness centrality, indicating their contribution in the community dynamics. The results of this study are helpful to understand the dynamic changes of bacterial community and their ecological network in the soil applied with manure.

Key words: purple soil, abundant bacteria, rare bacteria, time dynamics, network analysis

SHENG Ni, CHENG Jianhua, SUN Zhixiang, TANG Xiangyu. Distribution Characteristics and Dynamics of Abundant and Rare Bacteria in Purple Soil of the Sichuan Basin[J]. Chinese Agricultural Science Bulletin, 2023, 39(35): 94-102.

Figures/Tables 7

References 46

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