Nitrous Oxide and Methane Emissions in Spring Maize Field in the Semi-Arid Regions of Loess Plateau

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• 作者：Jishao Jiang ; Rui Wang ; Zhiqi Wang ; Shengli Guo and Xiaotang Ju
• 刊名：CLEAN – SOIL, AIR, WATER
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：45
• 期：1
• 全文大小：1754K
• ISSN：1863-0669

文摘

A 2-year field study was conducted to measure nitrous oxide (N₂O) and methane (CH₄) in a rain-fed spring maize cropland in the Loess Plateau, P. R. China, and to determine the effects of optimized nitrogen (N) fertilization practices on urea-derived N₂O emission factor (EF), grain yield, net greenhouse gas (NGHG) emission, and net greenhouse gas intensity (NGHGI). Five treatments were considered, including control (CK), conventional N fertilization (Con), optimal N fertilization (Opt), optimal N fertilization plus nitrification inhibitor (Opt + DCD), and optimal N fertilization with slow release urea (Opt + SR). Soil acted as a small sink for atmospheric CH₄. Nitrogen fertilization and heavy rainfall events (>40 mm) were the main factors controlling N₂O emissions. The annual mean EF ranged from 0.12 to 0.55%. Compared to conventional N fertilizer, nitrification inhibitor decreased the annual cumulative N₂O, NGHG, and NGHGI emissions by 45, 52, and 48%, respectively, without decreasing grain yield. In conclusion, nitrification inhibitor addition was the most effective practice to reduce N₂O emissions in the rain-fed regions of Loess Plateau.