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Impact of 36 years of nitrogen fertilization on microbial community composition and soil carbon cycling-related enzyme activities in rhizospheres and bulk soils in northeast China

文献类型： 外文期刊

作者： Wang, Qingfeng 1 ; Ma, Mingchao 1 ; Jiang, Xin 1 ; Guan, Dawei 1 ; Wei, Dan 5 ; Zhao, Baisuo 4 ; Chen, Sanfeng 2 ; Cao, F 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.China Agr Univ, Coll Biol Sci, Beijing 100094, Peoples R China

3.Univ Liege, Gembloux Agrobio Tech, Microbial Proc & Interact Res Unit, Passage Deportes 2, Gembloux, Belgium

4.Minist Agr, Lab Qual & Safety Risk Assessment Microbial Prod, Beijing 100081, Peoples R China

5.Heilongjiang Acad Agr Sci, Inst Soil Fertil & Environm Sources, Harbin 150086, Heilongjiang, Peoples R China

关键词： Black soil; Rhizosphere; Enzyme activities; Nitrogen fertilization; Decomposition

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN： 0929-1393

年卷期： 2019 年 136 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) deposition can change ecosystem functions but little is known of long-term N-deposition and rhizosphere effects on the microbial community composition and enzymes activities related to the carbon (C) cycle in the black soil common to northeastern China. Here, we studied two enzyme activities involved in C cycles and microbial community composition in both the rhizosphere and bulk soil from a long-term (36-year) fertilization field experiment. N-addition significantly decreased bacterial abundance and phenol oxidase activity, but enhanced fungal abundance and peroxidase activity, in both the rhizosphere and bulk soil. The fungal diversity exhibited more obvious shifts than the bacterial diversity after long-term N-addition, resulting in significantly decreased bacterial and fungal diversity levels, except for bacterial diversity in the rhizosphere, which was not significantly changed. Moreover, the enzyme activities and the bacterial and fungal abundance levels were higher in the rhizosphere than in the bulk soil, suggesting a rhizosphere effect on microbial activities involved in the C cycle. There was a significant difference in the microbial community compositions among different N-addition levels. A lesser beta-diversity response to N-addition was observed in the rhizosphere than in the bulk soil, and the responses of fungal communities were greater than those of bacterial communities. Our findings suggested that rhizosphere effects and fertilization regimes both have significant influences on microbial communities and soil enzyme activities, and that fungi were more sensitive than bacteria in responding to N-deposition.

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