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Dynamics of soil gross nitrogen transformations during post-agricultural succession in a subtropical karst region

文献类型： 外文期刊

作者： Song, Min 4 ; He, Tieguang 2 ; Chen, Hao 1 ; Wang, Kelin 1 ; Li, Dejun 1 ;

作者机构： 1.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

2.Guangxi Acad Agr Sci, Agr Resources & Environm Res Inst, Nanning 530007, Guangxi, Peoples R China

3.Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China

4.Hunan Agr Univ, Coll Agron, Changsha 410125, Hunan, Peoples R China

关键词： Gross N transformations; N cycling; Soil N status; N cycling-related enzymes; Karst region; Post-agricultural succession

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2019 年 341 卷

页码：

收录情况： SCI

摘要： Gross nitrogen (N) transformations are crucial in determining soil N status, but how gross N transformations change during post-agricultural succession remains poorly understood. Here, gross N transformations were measured using a N-15 isotope dilution technique in a subtropical karst region, southwest China. A stratified random sampling scheme was adopted and the succession sequence included grassland (similar to 4 years), shrubland (similar to 15 years) and secondary forest (similar to 30 years) with cropland as reference. The soil was leptosols (limestone soil). Soil total N concentrations were significantly (P < 0.05 hereafter) elevated in the shrubland and forest relative to the cropland and grassland. No clear pattern was found for NH4+ concentration, but NO3- concentration increased from the grassland to the forest. The gross rates of N mineralization and nitrification (GN) were significantly lower in the grassland than in the cropland, but increased significantly during post-agricultural succession. There were no clear patterns for the rates of dissimilatory NO3- reduction to NH4+ and gross NO3- immobilization. Gross NH4+ immobilization (GAI) in the forest was lowest but there was no significant difference among the cropland, grassland and shrubland. Gross N mineralization rate correlated significantly with protease activity, implying that the depolymerization of N-containing polymers was likely the rate-limiting step of gross N mineralization. Net nitrate production rate and GN:GAI ratio increased significantly from the grassland to the forest, supporting that soil N cycling likely became more open during post-agricultural succession in the karst region of southwest China.

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