Organic-C quality as a key driver of microbial nitrogen immobilization in soil: A meta-analysis
文献类型： 外文期刊
作者： Cao, Yansheng 1 ; He, Zhenli 2 ; Zhu, Tongbin 3 ; Zhao, Fengliang 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Hainan Key Lab Trop Ecocircular Agr, Natl Agr Expt Stn Agr Environm, Haikou 571101, Hainan, Peoples R China
2.Univ Florida, Indian River Res & Educ Ctr, Inst Food & Agr Sci, Ft Pierce, FL 34945 USA
3.Inst Karst Geol, Karst Dynam Lab, MLR & Guangxi, CAGS, Guilin 541004, Peoples R China
4.Int Res Ctr Karst, Auspices UNESCO, Guilin 541004, Peoples R China
关键词： Organic-C quality; C/N ratio; Microbial N immobilization
期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）
ISSN： 0016-7061
年卷期： 2021 年 383 卷
页码：
收录情况： SCI
摘要： Microbial nitrogen (N) immobilization in soil can be enhanced by increasing carbon (C) bioavailability, yet the response of microbial N immobilization to the addition of organic matter is uncertain. In the present study, we investigated the effect of organic matter quality on microbial N immobilization. The response ratio (ln R), i.e., the ratio of microbial N immobilization in organic-C amended soil to that in control treatments, was calculated using data from 51 published studies. Overall, the addition of organic-C increased significantly microbial N immobilization by 105% relative to unamended soil. The type of organic-C affected the response of microbial N immobilization to organic-C addition. Glucose (classified as a labile compound) was more effective in stimulating microbial N immobilization than cellobiose and cellulose (classified as intermediately decomposable compounds). Tannin and oxalic acid (classified as recalcitrant compounds) did not significantly affect microbial N immobilization. The C/N ratio of organic materials did not affect the response of microbial N immobilization in the short-term (<280 d); differences in the effect size (ln R+) were not significant among different C/N ratio groups. The effect of the form of inorganic-N (ammonium [NH4+] or nitrate [NO3-]) on the response of microbial N immobilization to organic-C addition was not significant, with a mean ln R+ of 0.838 (confidence interval [CI]: 0.590-1.099) for NH4+ and 1.642 (CI: 0.951-2.452) for NO3-. Moreover, the In R of microbial NH4+ immobilization showed a significant positive relationship (P < 0.01) with that of microbial NO3- immobilization. The In R+ for the experimental period decreased in the order of <30 d, 60-120 d, >= 120 d, and 30-60 d. The chemical quality of organic-C defined by three C pools (i.e., labile, intermediate, and recalcitrant) rather than the C/N ratio is a critical factor regulating the response of microbial N immobilization to organic-C addition.
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