Effect of Straw Mulch on Runoff and NPS Pollution Reduction from Experimental Plots under a Climate Change Scenario in Korea

Abstract

AbstractThis 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 wit...