In order to expound the role of litter in controlling soil and water loss,the soil and water conservation functions of litter in Chinese pine stand have been studied,using the method of location monitor combined with ...In order to expound the role of litter in controlling soil and water loss,the soil and water conservation functions of litter in Chinese pine stand have been studied,using the method of location monitor combined with simulation experiment.The results of the studies showed that the average interception rate of the litter is 12.4%,it’s retarding effect on runoff is related to litter thickness,slope and runoff depth.The mathematical equation between them is ΔT =13.490· l 0.245 · α -0.200 · q -0.186 ,the annual soil evaporation restrained by litter of 2 cm in thickness is 138 6mm,and the litter of 1 5 cm in thickness can decrease the splash erosion by 97 5% and increase soil antiscourability by 96 7%.Compared with the bare slope,the physical and chemical properties of soil covered with litter are improved obviously.All these provide the scientific basis for the rational management of forest and the estabishment of the optimal structure of stand.展开更多
Soil and water conservation mechanism of vegetation has been explained through analysing the effects of vegetation at different layers on rainfall. The vegetation cause the result of reduction of runoff amount,runoff ...Soil and water conservation mechanism of vegetation has been explained through analysing the effects of vegetation at different layers on rainfall. The vegetation cause the result of reduction of runoff amount,runoff energy and runoff carrying sediment. and vegetation improving soil to make a great role of soil and water conservation because of vegetation increasing resistant soil erosion. The research point out soil and water conservation function of vegetation is due to using out runoff amount continually by vegetation at different layers, and the accumulation effects of vegetation at different layers lead quickly reduction of soil erosion amount as to realize bring function of vegetation soil and water conservation into full play.展开更多
文摘In order to expound the role of litter in controlling soil and water loss,the soil and water conservation functions of litter in Chinese pine stand have been studied,using the method of location monitor combined with simulation experiment.The results of the studies showed that the average interception rate of the litter is 12.4%,it’s retarding effect on runoff is related to litter thickness,slope and runoff depth.The mathematical equation between them is ΔT =13.490· l 0.245 · α -0.200 · q -0.186 ,the annual soil evaporation restrained by litter of 2 cm in thickness is 138 6mm,and the litter of 1 5 cm in thickness can decrease the splash erosion by 97 5% and increase soil antiscourability by 96 7%.Compared with the bare slope,the physical and chemical properties of soil covered with litter are improved obviously.All these provide the scientific basis for the rational management of forest and the estabishment of the optimal structure of stand.
基金中国科学院西部行动项目(KZCX1-10-04)Regional impacts of re-vegetation on water resources of the Loess Plateau,China and the Middle and Upper Murrumbidgee Catchment,Australia(LWR1/2002/018)黄委会水保基金项目
文摘Soil and water conservation mechanism of vegetation has been explained through analysing the effects of vegetation at different layers on rainfall. The vegetation cause the result of reduction of runoff amount,runoff energy and runoff carrying sediment. and vegetation improving soil to make a great role of soil and water conservation because of vegetation increasing resistant soil erosion. The research point out soil and water conservation function of vegetation is due to using out runoff amount continually by vegetation at different layers, and the accumulation effects of vegetation at different layers lead quickly reduction of soil erosion amount as to realize bring function of vegetation soil and water conservation into full play.
