Effects of Climate Change On Soil Erosion Reduction With Rice Straw Mat Using Measured Field Slope and Slope Length and Climate Change Scenarios.

Due to climate changes in recent years worldwide, various impacts on hydrology and soil erosion of climate change have been investigated by many researchers.  In this study, the Soil and Water Assessment Tool (SWAT) was used to evaluate effects of rice straw mat on soil erosion reduction.  In this study, measured field slope and slope length data were used for accurate simulation of soil erosion modeling instead of estimated slope and slope length, which is default method in SWAT.  Bias-corrected future precipitation data and the relationship between USLE P and field slope were used in SWAT hydrology/sediment runs.  The analysis revealed that the sediment would be generated more with increase in the precipitation under climate change scenarios, especially 2040-2060 century.  In addition, the effects of rice straw mat on soil erosion/sediment reduction under climate changes scenario were affected by the field slope and slope length because these two topographic factors affects the surface and subsurface runoff for each HRU, combinations of land use and soil.  As shown in this study, rice straw mat would not be efficient soil erosion Best Management Practices under different climate scenarios. 

Keywords: SWAT, Climate Scenario, Straw mat, topography, sediment