Concentration and composition of soil amino compounds in major Chinese croplands 期刊名称： Chemistry & Ecology
作者： Cao, Xiaochuang,Zhong, Chu,Ma, Qingxu,Zhu, Lianfeng,Zhang, Junhua,Jin, Qianyu,Wu, Lianghuan,Zhu, Yuanhong
年份： 2017年
期号： 第2期
关键词： Spatial distribution;composition;amino acids;inorganic N;Chinese
agricultural soils
摘要：The importance of organic nitrogen (N) in soil N cycle is difficult to assess because of uncertainties regarding its composition, sources, and bioavailability. The objective of this study was to characterise the distribution of soil inorganic N and amino compounds in major Chinese croplands. Results demonstrated that soil extractable N composition was dominated by inorganic N (), and the cont
ents of different N forms widely varied across the 11 different soils. Free amino acid contents ranged from 0.26 to 1.03 mg N kg1. In contrast, soil-adsorbed amino acids were approximately seven times greater than the free amino acids, which likely represent a potential important pool for free amino acids. Pearson analysis showed that soil free and -adsorbed amino acids were negatively related to soil pH (r = .39 to .81, p < .05),
characterise
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