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Responses of paddy soil bacterial community assembly to different long-term fertilizations in southeast China

微生物种群生物学 土壤肥力 环境科学 生物 土壤有机质 修正案 土壤碳 土壤水分 农学 生态学 政治学 遗传学 法学 细菌
作者
Yongjie Yu,Meng Wu,Evangelos Petropoulos,Jianwei Zhang,Jun Nie,Yulin Liao,Zhongpei Li,Xiangui Lin,Youzhi Feng
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:656: 625-633 被引量:90
标识
DOI:10.1016/j.scitotenv.2018.11.359
摘要

Recent works have shown that long-term fertilization has a critical influence on soil microbial communities; however, the underlying ecological assemblage of microbial community as well as its linkage with soil fertility and crop yield are still poorly understood. In this study, using analysis of high-throughput sequencing of 16S rRNA gene amplicons, we investigate mean pairwise phylogenetic distance (MPD), nearest relative index (NRI), taxonomic compositions and network topological properties to evaluate the assembly of the soil microbial community developed in 30-year fertilized soils. The phylogenetic signal indicates that environmental filtering was a more important assembly process that structure the microbial community than the stochastic process. Increase of soil fertility indexes, such as cation exchange capacity (CEC), soil organic matter (SOM) and available P (AP), driven by balanced fertilizations and straw returning amendment, result in the decrease of environmental filtering on the bacterial community assembly. Network parameters show that the amendment of straw returning provides with more niches, which lead to more complex phylotype co-occurrence. Increase of crop yield under balanced fertilizations might due to the increase of soil microbial function traits, which is associated with decreasing influence of environmental filtering. The significantly increased bacterial genera, Candidatus Koribacter, Candidatus Solibacter, and Fimbriimonas, in straw returning treatments, might be the key species in the competition caused by long-term environmental filtering. These results are helpful for a unified understanding of the ecological processes for microbial communities in different fertilized agroecosystem and the development of sustainable agriculture.
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