The quality and quantity of exogenous organic carbon input control microbial NO3- immobilization: A meta-analysis
The quality and quantity of exogenous organic carbon input control microbial NO3- immobilization: A meta-analysis
复制标题
外源有机碳输入控制微生物NO3-固定化的质量和数量：荟萃分析
DOI：
10.1016/j.soilbio.2017.09.006
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发表时间：
2017-12-01
影响因子：
9.7
通讯作者：
Wang, Shenqiang
中科院分区：
文献类型：
--
作者：
Cheng, Yi;Wang, Jing;Wang, Shenqiang
土壤中非氮的积累导致氮（N）通过径流、淋溶和气体排放的损失增加。长期以来，由于认为微生物优先降解NHS ~（4+）-N的观点，微生物固定NO作为减少土壤NO积累的一个重要途径一直被忽视。微生物非固定化通常是碳（C）限制的，因此外源有机C输入可以增强微生物非固定化。然而，外源有机碳输入的质量和数量对土壤微生物固定化非营养物质的影响还知之甚少，缺乏对这种影响的综合评价。因此，我们评估了外源有机C类型，简单有机C（葡萄糖和乙酸盐），复合有机C类型（动物粪便，植物残体）的施用量和复合有机C的C/N比对土壤微生物非固定化率的影响，采用荟萃分析。结果表明，外源C输入的质量和数量对土壤微生物非固定化有影响：添加>500 mg C kg（-1）的简单有机C或C/N>18的复合有机C可增强土壤微生物非固定化。此外，土壤微生物的非和NH 4+固定的响应比的自然对数之间的正相关关系表明，在提高C的有效性的同时利用NHS和非。因此，高比例或高C/N比的外源有机碳输入可以提高土壤微生物对非硝化氮的固定，减少土壤非硝化氮的积累。(C)2017爱思唯尔有限公司版权所有
The accumulation of NOT in the soil has resulted in increased nitrogen (N) loss through runoff, leaching, and gaseous emissions. Microbial immobilization of NOT as an important process in reducing soil NOT accumulation has been for a long time neglected due to the predominant viewpoint that microbes preferentially immobilize NHS4+-N. Microbial NOT immobilization is generally carbon (C)-limited, and thus exogenous organic C input may enhance microbial NOT immobilization. However, the effect of the quality and quantity of exogenous organic C input on soil microbial NOT immobilization is poorly understood, and a synthetic assessment on such an effect is lacking. We thus assessed the impact of exogenous organic C type, the application rate of simple organic C (glucose and acetate), complex organic C type (animal manure, plant residue) and the C/N ratio of complex organic C on soil microbial NOT immobilization rate using a meta-analysis. We found that the quality and quantity of exogenous C input affect soil microbial NOT immobilization: microbial NOT immobilization was enhanced with the addition of simple organic C at rates >500 mg C kg(-1), or complex organic C with C/N ratios >18. Furthermore, a positive relationship between the natural log of response ratio of soil microbial NOT and NH4+ immobilization indicates the simultaneous utilization of NHS and NOT under elevated C availability. We conclude that specific exogenous organic C input at a high rate or with a high C/N ratio can enhance microbial NOT immobilization and reduce soil NOT accumulation. (C) 2017 Elsevier Ltd. All rights reserved.