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Effect of high soil C/N ratio and nitrogen limitation caused by the long-term combined organic-inorganic fertilization on the soil microbial community structure and its dominated SOC decomposition

文献类型： 外文期刊

作者： Cui, Jiwen 1 ; Zhu, Ruili 1 ; Wang, Xiya 1 ; Xu, Xinpeng 1 ; Ai, Chao 1 ; He, Ping 1 ; Liang, Guoqing 1 ; Zhou, Wei 1 ; Zhu, Ping 2 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resource & Reg Planning, Key Lab Plant Nutr & Fertilizer, Minist Agr, Beijing 100081, Peoples R China

2.Jilin Acad Agr Sci, Gongzhuling 130124, Peoples R China

关键词： Organic fertilizers; Enzymatic stoichiometry; Microbial nitrogen limitation; Microbial community structure; Key microbial taxa

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.91； 五年影响因子：8.549 ）

ISSN： 0301-4797

年卷期： 2022 年 303 卷

页码：

收录情况： SCI

摘要： The application of organic fertilizers, such as straw and manure, is an efficient approach to maintain soil productivity. However, the effect of these organic fertilizers on soil microbial nutrient balance has not yet been established. In this study, the effects of the long-term combined organic-inorganic fertilization on microbial community were investigated by conducting a 30-year-long field test. Overall, the following five fertilizer groups were employed: inorganic NP fertilizer (NP), inorganic NK fertilizer (NK), inorganic NPK fertilizer (NPK), NPK + manure (MNPK), and NPK + straw (SNPK). The results indicated that the mean natural logarithm of the soil C:N: P acquisition enzyme ratio was 1.04:1.11:1.00 under organic-inorganic treatments, which showed a deviation from its overall mean ratio of 1:1:1. This indicates that microbial resources do not have a balance. Vector analysis (vector angle 45 degrees) and threshold elemental ratio analysis (RC:N-TERC:N 0) further demonstrated that the microbial metabolism was limited by Nitrogen (N) under SNPK and MNPK treatments. N limitation further influenced soil microbial community structure and its dominated SOC decomposition. Specifically, Microbial communities transformed into a more oligotrophic-dominant condition (fungal, Acidobacteria, Chloroflexi) from copiotrophic-dominant (Proteobacteria, Actinobacteria) condition with increasing N limitation. Lysobacter genus and Blastocatellaceae family, in the bacterial communities along with the Mortierella elongata species in fungal communities, were markedly associated with the N limitation, which could be the critical biomarker that represented N limitation. Both correlation analysis and partial least squares path modeling showed significant positive effects of N limitation on the ratio of bacterial functional genes (Cellulase/Amylase), involved in recalcitrant SOC degradation.

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[1]Effect of high soil C/N ratio and nitrogen limitation caused by the long-term combined organic-inorganic fertilization on the soil microbial community structure and its dominated SOC decomposition. Cui, Jiwen,Zhu, Ruili,Wang, Xiya,Xu, Xinpeng,Ai, Chao,He, Ping,Liang, Guoqing,Zhou, Wei,Zhu, Ping. 2022

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