Simulation and Influence Factors of Nitrous Oxide () Gases Emission under Different Straw Retention Depths
Publication: Journal of Environmental Engineering
Volume 146, Issue 3
Abstract
Straw retention is an important practice increasing crop production worldwide. It also can reduce nitrous oxide () gas emissions from agricultural soils. But it is very difficult to predict gas discharge amounts when straw is incorporated at different soil depths. This research combined wheat growing season data from the Agricultural Meteorological Experiment Station of Nanjing University of Information Science and Technology, China, with the denitrification-decomposition model (DNDC model) to determine whether the DNDC could simulate the emission rate, annual discharge, and effect of incorporation depth on emissions. Straw was retained on the soil surface, and incorporated at 10, 20, and 30 cm depths. The sensitivity of emissions to several site-specific and environmental factors was also examined. The results were as follows: (1) the DNDC model was able to simulate the emission rate and annual emission rate from different straw incorporation depths; (2) gas emissions are sensitive to annual mean temperature, soil pH, and amounts of soil organic carbon, fertilization, and retained straw, which have different impacts under different straw incorporation depths; and (3) the direct influence of soil internal factors was more important than environmental factors in the surface and 10-cm treatments; however, the influence of straw retention decreased and the influence of environmental factors increased in the 20- and 30-cm treatments.
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Data Availability Statement
All of the data used during this study are available from the corresponding author (Dr. Can Chen) by request (such as flux amount data, flux amount data, all of the soil parameters data, fertilization data, and irrigation data, among others).
Acknowledgments
The authors thank Dr. Christopher Ogden for his checking of the English language and comments on this paper. This work was supported by the Natural Science Foundation of Jiangsu Province, China (No. BK 20150909), State Key Laboratory of Soil and Sustainable Agriculture (Institute of Soil Science, Chinese Academy of Sciences) Grant No. Y20160038 and Foundation of Chinese postdoctoral (2016M591884).
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 8, 2019
Accepted: Aug 13, 2019
Published online: Jan 11, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 11, 2020
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