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Characteristics of organic material inputs affect soil microbial NO3− immobilization rates calculated using different methods
European Journal of Soil Science ( IF 4.0 ) Pub Date : 2020-03-28 , DOI: 10.1111/ejss.12963
Zhao-Xiong Chen 1 , Hui-Min Zhang 1 , Xiao-Shun Tu 1 , Xin Sun 1 , Jing Wang 2 , Yi Cheng 1, 3 , Jin-Bo Zhang 1, 3, 4 , Zu-Cong Cai 1, 5, 6 , Scott X. Chang 7, 8
Affiliation  

Microbial immobilization of nitrate (NO3) is considered to be an important process in reducing NO3 accumulation and regulating nitrogen (N) retention capacity in soils. Accurately quantifying the rate of microbial NO3 immobilization is, therefore, necessary to predict its role in lowering NO3 accumulation in soils. We compared microbial NO3 immobilization rates using a 15NO3 labelling technique in three different ways: (a) 15N pool dilution, (b) organic 15N recovery and (c) microbial biomass 15N recovery, in a nitrate‐rich upland soil with and without amendment with organic materials with differing carbon‐to‐nitrogen ratios (C/N). The three methods generated similar NO3 immobilization rates, except when the soil was amended with easily decomposable organic materials (glucose and sucrose). We also developed a microbial NO3 immobilization‐specific quality index that incorporates the C/N ratio, lignin, cellulose and hemicellulose contents and pH for slowly decomposing organic materials (plant residues). This study provides direct empirical evidence that the results of different methods for calculating soil microbial NO3 immobilization rates are affected by the characteristics of organic materials added to the soil.

中文翻译:

有机物质输入的特性会影响土壤微生物对NO3-的固定率,采用不同方法计算得出

硝酸盐(NO的微生物固定化3 - )被认为是一个重要的过程中减少NO 3 -的积累和调节土壤中的氮(N)保留容量。精确量化微生物NO的速率3 -固定化,因此,有必要在降低NO预测其作用3 -在土壤中积累。我们比较微生物NO 3 -使用固定化率15 NO 3 -以三种不同方式标记技术:(1)15氮库稀释,(b)中的有机15氮肥利用率和(c)的微生物生物质15在富含硝酸盐的旱地土壤中,采用或不采用碳氮比(C / N)不同的有机物质对氮进行恢复。这三种方法产生的相似NO 3 -的固定化率,当土壤用易分解有机物质(葡萄糖和蔗糖)修正除。我们还开发了微生物NO 3 -固定化特定的质量并入对于缓慢分解有机材料(植物残基)的C / N比,木质素,纤维素和半纤维素含量和pH值的索引。这项研究提供了直接的经验证据表明,不同的方法来计算土壤微生物NO结果3 - 固定速率受添加到土壤中的有机材料特性的影响。
更新日期:2020-03-28
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