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Organic-C quality as a key driver of microbial nitrogen immobilization in soil: A meta-analysis
Geoderma ( IF 6.1 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.geoderma.2020.114784
Yansheng Cao , Zhenli He , Tongbin Zhu , Fengliang Zhao

Abstract 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 ln R of microbial NH4+ immobilization showed a significant positive relationship (P

中文翻译:

有机碳质量作为土壤中微生物氮固定的关键驱动因素:荟萃分析

摘要 增加碳 (C) 生物有效性可以增强土壤中微生物氮 (N) 的固定化,但微生物固氮对添加有机质的响应尚不确定。在本研究中,我们研究了有机质质量对微生物固氮的影响。响应比 (ln R),即有机碳改良土壤中微生物 N 固定与对照处理的比率,是使用 51 项已发表研究的数据计算得出的。总体而言,相对于未经改良的土壤,添加有机碳显着增加了 105% 的微生物 N 固定。有机碳的类型影响微生物固氮对有机碳添加的响应。葡萄糖(归类为不稳定化合物)在刺激微生物氮固定方面比纤维二糖和纤维素(归类为中间可分解化合物)更有效。单宁和草酸(归类为顽固化合物)对微生物 N 的固定没有显着影响。有机物的C/N比在短期内(≤280 d)不影响微生物固氮的响应;不同 C/N 比组之间的效应大小 (ln R+) 差异不显着。无机氮的形式(铵 [NH4+] 或硝酸盐 [NO3−])对微生物 N 固定对有机碳添加的响应的影响不显着,平均 ln R+ 为 0.838(置信区间 [CI] : 0.590–1.099) NH4+ 和 1.642 (CI: 0.951–2.452) NO3-。而且,
更新日期:2021-02-01
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