Effect of Straw Mulch on Runoff and NPS Pollution Reduction from Experimental Plots under a Climate Change Scenario in Korea
Publication: Journal of Irrigation and Drainage Engineering
Volume 141, Issue 8
Abstract
This study attempted to quantify the effects of rice straw mulches on runoff and nonpoint source (NPS) pollution under a future climate change scenario. For this, regression equations between the observed rainfall and runoff curve number (CN) were developed to estimate NPS pollution from radish fields. Rainfall data from the special report on emissions scenarios (SRES) A1B were applied to the regression equations in order to predict future runoff and NPS pollution by surface covers. The results show that future rainfall was estimated to increase by 0.8% in the 2020s, 14.4% in the 2050s, and 15.1% in the 2080s. Under the projected rainfall conditions, the loose straw and the straw mat mulches were estimated to reduce runoff by 65.7 to 66.8% and 95.8 to 96.9%, respectively, while the selected pollutants were reduced by 44.1 to 98.8% and 58.9 to 94.9%, respectively. Both types of straw mulch were effective in controlling both runoff and NPS pollution, and thus offer a very promising means to cope with the effect of climate change such as flood, drought, and water quality conservation. Similar studies should be conducted on a wide range of crops, soils, and rainfall conditions to better estimate the effectiveness of mulches more broadly and to assist in the development of national NPS pollution management strategies with respect to expected changes in climate.
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Acknowledgments
This research was supported by the Agricultural Non-Point Source (AG-NPS) Research Program administrated by Rural Research Institute, Korea Rural Community Corporation, Korea. The authors acknowledge the generous support.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 141 • Issue 8 • August 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 28, 2014
Accepted: Dec 2, 2014
Published online: Jan 20, 2015
Discussion open until: Jun 20, 2015
Published in print: Aug 1, 2015
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