桑树在紫色土水土保持效应方面研究

Study on Mulberry Effect of Soil and Water Conservation Applying in Purple Soil

作为退耕还林的一种树种桑树在蚕业方面的经济效益有目共睹,而在水土保持方面的效益及应用研究较少,通过对玉米种植地、毛桑种植地和良桑种植地3个地块在8次降雨中的4次水土流失过程进行效益对比,分析侵蚀量、侵蚀时间与降雨因子的回归关系。结果表明:在4次降雨侵蚀过程中,毛桑区和良桑区的径流总量比玉米地块分别减少24.78%和37.83%,泥沙总流失量比玉米地块减少21.85%和33.55%;4次降雨过程中,3个地块的土壤养分流失依次是玉米地>毛桑区>良桑区,侵蚀量、侵蚀时间与降雨因子的回归关系均十分显著。

As a kind of material of closing land for forest,the economic performance of mulberry at the aspect of the sericulture is obvious,but there are few study about the benefit and application in soil and water conservation.the paper contrast the soil and water conservation benefit among three district:maize ground,submarginal mulberry ground and high yield mulberry ground under four times soil loss,analyze the regression relation between erosion capacity,erosion time and rainfall factor.The result shows:the runoff of submarginal mulberry ground and high yield mulberry ground reduces respectively 24.78% and 37.83% than maize ground in four rainfall erosion courses,and the sediment of runoff reduces 21.85% and 33.55% than the maize ground.In four rainfall courses,the nutrient loss of three districts is maize ground> submarginal mulberry ground>high yield mulberry ground,and the regression relation among erosion capacity,erosion time and rainfall factor are very notable.