Simulation of Nitrous Oxide Emission and Mineralized Nitrogen under Different Straw Retention Conditions Using a Denitrification-Decomposition Model

被引：16
作者：
Chen, Can [1 ]
Chen, Deli [2 ]
Lam, Shu Kee [2 ]
机构：
[1] Nanjing Univ Informat Sci & Technol, Coll Appl Meteorol, Nanjing 210044, Jiangsu, Peoples R China
[2] Univ Melbourne, Melbourne Sch Land & Environm, Melbourne, Vic 3010, Australia
来源：
CLEAN-Soil Air Water | 2015年 / 43卷 / 04期
基金：
澳大利亚研究理事会;
关键词：
DNDC model; Mineralized nitrogen; N2O emission; Straw retention methods;
D O I：
10.1002/clen.201400318
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Straw retention has been adopted worldwide to increase crop production and it has also been shown to reduce nitrous oxide (N2O) emission from agricultural soils. However, it is difficult to accurately predict N2O emission under different straw retention methods without a long-term experiment. This study used data from the maize planting season in the Griffith region, Australia, to test whether the denitrification-decomposition (DNDC) model can simulate the rate, annual amount, and pattern of N2O emission. The sensitivity to several important factors which may affect N2O emission was analyzed. The research investigated whether the DNDC model can be used to determine the best straw retention method to reduce N2O emission. The results were as follows: (1) The DNDC model could be used to simulate soil and climate conditions of Griffith region. The correlation coefficients of simulated and observed water-filled pore space and temperature were 0.9532 (n = 126) and 0.9781 (n = 365), respectively; (2) the simulation values of 300N-burn and 300N-incorporate for a year were 12.96 and 8.08 kg N ha(-1) year(-1) and the emission factors were 3.31 and 1.77, respectively; (3) the emission reduction effect and mineralized N accumulation of straw incorporation were better compared to burnt straw, using the DNDC model. The correlation coefficients of simulated and observed daily values of 300N-burn and 300N-incorporate were 0.8743 and 0.8023, respectively; (4) the amount and frequency of nitrogen fertilizer application, irrigation frequency, and soil texture could affect N2O emission, whereas soil pH and soil bulk density did not.
引用
收藏
页码：577 / 583
页数：7
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