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University of Chinese Academy of Sciences (中国科学院大学) 2015

Effects of Nitrogen Fertilization And Rotation on Greenhouse Gases Emissions on Arid-Highland of The Loess Plateau

姜继韶

Titre : Effects of Nitrogen Fertilization And Rotation on Greenhouse Gases Emissions on Arid-Highland of The Loess Plateau

Auteur : 姜继韶

Grade : Doctoral Dissertation 2015

Université : University of Chinese Academy of Sciences (中国科学院大学)

Résumé partiel
Agricultural ecosystem is an important emitter of N2 O, CH4 and CO2, accounting for 60%, 50% and 10% of the global N2 O, CH4 and CO2 emissions, respectively. The rainfed farmland area accounts for 80% of the global farmland area. In China, rainfed farmland area account for more than 70% of total land area, mainly in the northern and northwestern regions. The Loess Plateau of northwest China covers more than 600,000 km2, consists of typical semiarid and arid areas with rainfed farming, and provides about 40% of the local food needs. Inherent soil fertility is low in the loess region and nitrogen(N) levels in all soils are particularly low. Nitrogen fertilization and cropping rotation are two important management measures to sustain soil productivity in the rainfed farmland on the Loess Plateau. Since 1980 s, chemical fertilizer addition has been an important measure to improve soil fertility and crop yields in the loess region. However, greenhouse gases(GHGs) emission under nitrogen fertilization and cropping rotation is not yet clear in the rainfed area.Two cropping systems of continuous spring maize and three-year rotation were designed to investigate GHGs emission at the State Key Agro-Ecological Experimental Station in the Loess Plateau(35°12′N, 107°40′E ; 1220 m.a.s.l.) in Changwu County, Shaanxi Province, China. For continuous spring maize cropping system, five treatments consist of control(CK), conventional N fertilization rate(Con), optimal N fertilization rate(Opt), optimal N fertilization rate plus nitrification inhibitor(Opt+DCD), and optimal N fertilization rate with slow release urea(Opt+SR). For three-year rotation system, i.e., winter wheat, millet, pea, to explore the changes in soil respiration and Q10 values under each cropping phase

Mots clés : Loess Plateau ;nitrogen fertilization ;rotation;CO2 ;N2O;Q10 ;

Présentation (CNKI)

Page publiée le 23 juin 2022