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[1]ZHAO Xiaofang,HUANG Mingbin.Spatial Distribution of Nitrogen of Topsoil in the Wangdonggou Watershed of the Loess Plateau[J].Research of Soil and Water Conservation,2019,26(04):62-67.

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Spatial Distribution of Nitrogen of Topsoil in the Wangdonggou Watershed of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 62-67 Column: Public date: 2019-06-11

Title:: Spatial Distribution of Nitrogen of Topsoil in the Wangdonggou Watershed of the Loess Plateau

Author(s):: ZHAO Xiaofang^1,2, HUANG Mingbin²; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: total nitrogen; nitrate-nitrogen; ammonium-nitrogen; land use type; geomorphic unit

CLC:: S153.6

DOI:: -

Abstract:: Wangdonggou watershed with the area of 8.3 km² is located in the gully-hilly region of the Loess Plateau. The objective of this study is to analyze the effects of different land use types and geomorphic units on the spatial distribution of soil nitrogen of topsoil in Wangdonggou watershed. The results indicated that the mean contents of total nitrogen, nitrate nitrogen and ammonium nitrogen in the surface layer of the study area were 0.99 g/kg, 9.80 mg/kg, 2.61 mg/kg, respectively. Land use types and geomorphic units had significant effects and interaction on the spatial distribution of soil total nitrogen and nitrate nitrogen, while the spatial variability of ammonium nitrogen content was not significant. The content of soil total nitrogen under different land use types decreased in the order: woodland > orchard > natural grassland > farmland > abandoned orchard; the content of nitrate nitrogen decreased in the order: orchard > farmland > woodland > abandoned orchard > natural grassland; the contents of ammonium nitrogen decreased in the order: woodland > natural grassland > orchard > farmland > abandoned orchard. The content of soil total nitrogen under different geomorphic units decreased in the order: loess tableland > gully > slope land; the content of nitrate nitrogen decreased in the order: loess tableland > gully > slope land; the content of ammonium nitrogen decreased in the order: gully > loess tableland > slope land. Understanding the spatial distribution of soil nitrogen and its components in the small watershed of the Loess Plateau can help improve management efficiencies of land use, fertilizer, and vegetation restoration on small watershed scale on the Loess Plateau.

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