Premium
Simulation of Nitrous Oxide Emission and Mineralized Nitrogen under Different Straw Retention Conditions Using a Denitrification–Decomposition Model
Author(s) -
Chen Can,
Chen Deli,
Lam Shu Kee
Publication year - 2015
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201400318
Subject(s) - straw , nitrous oxide , denitrification , nitrogen , environmental science , fertilizer , soil science , soil water , decomposition , chemistry , agronomy , atmospheric sciences , zoology , environmental chemistry , geology , organic chemistry , inorganic chemistry , biology
Straw retention has been adopted worldwide to increase crop production and it has also been shown to reduce nitrous oxide (N 2 O) emission from agricultural soils. However, it is difficult to accurately predict N 2 O 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 N 2 O emission. The sensitivity to several important factors which may affect N 2 O emission was analyzed. The research investigated whether the DNDC model can be used to determine the best straw retention method to reduce N 2 O 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 N 2 O emission, whereas soil pH and soil bulk density did not.