HYDRO-ECOLOGICAL EFFECTS OF CITRUS LAND UNDER VEGETATION MEASURES OF SOIL AND WATER CONSERVATION IN RED-SOIL SLOPE

Runoff and sediment characteristics of citrus land under vegetation measures were evaluated based on different standard runoff plots experiments from 2001 to 2008 in Jiangxi Provincial Soil and Water Conservation Eco-science Park.Soil water conditions and their dynamics were also analyzed according to soil moisture data measured in 2010.Soil and water conservation benefits of bermudagrass(Cynodon dactylon) strip covered,bermudagrass full covered and orchard clean tillage were studied.Results showed that the amount of runoff and sediment of citrus plots covered with grass was less than that of clean tillage obviously.The effects of bermudagrass strip covered was best,accounting 98.21 percent in reducing runoff and 99.84 percent in reducing sediment loss.In most soil depth,the soil moisture content of citrus land covered with grass strip was higest and higher than clean tillage measures;while the soil moisture of grass full covered was lower than that of grass strip covered because of water consumption caused by plant transpiration.Grass strip was an effective measure for citrus woodland soil erosion control and played a significant role on runoff and sediment reduction and the accumulation of moisture.