数字农科院2.0

The dynamics of dissolved organic N in the fumigated soils

文献类型： 外文期刊

作者： Li, Guitong;Lin, Qimei;Zhao, Xiaorong;Cao, Aocheng

作者机构：

关键词： ammonium: 14798-03-9;dissolved organic carbon: DOC;1;3-dichloropropene: pesticide;fumigant;dissolved inorganic nitrogen: DIN;dissolved organic nitrogen: DON;metam sodium: 137-42-8;pesticide;fumigant;chloropicrin: 76-06-2;pesticide;fumigant;microbial biomass nitrogen: MBN;dissolved amino acid: DAAChina: Asia;Palearctic region;agricultural ecosystem;molecular weight;environment;microbial decomposition;fumigated soil

期刊名称： BIOLOGY AND FERTILITY OF SOILS

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The aim of this study was to investigate the dynamics of dissolved organic N in soils fumigated separately with chloropicrin (CP), 1,3-dichloropropene, and metam sodium (MS) for 7 days and then incubated at 25A degrees C for 84 days. The dissolved organic N (DON) at 14 days after fumigation was mainly dissolved amino acids (DAA) which were then rapidly mineralized to ammonium. However, the DON pool at later incubation times was mainly high molecular weight organic N which was resistant to microbial decomposition. Three soil fumigants all increased the proportions of DON in total dissolved N and DAA in DON. Dissolved organic N became much more important mobile N source in CP- and MS-fumigated soils, and this may increase the risks of DON leaching in agricultural ecosystems.

分类号： S15

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