In order to improve the effects of biological soil crusts on soil moisture condition,we studied the soil and water conservation effects of biological soil crusts(BSCs) from two aspects(water infiltration and yield of runoff and sediment) under 3 harrowing intensities in the wind-water erosion crisscross region on the Loess Plateau,based on located field observation.The results were as follows:(1)Compared to impacts of bare soil,effects of BSCs on water infiltration and runoff showed temporal variations,which increased infiltration and decreased runoff at the early stage of rainy season,while showed an opposite effects in the later period of rainy season.(2) The harrowing BSCs reduced runoff and increased water infiltration.Compared to the control treatment(bare soil),mild-harrowing BSCs reduced runoff by 22.6％ and increased infiltration by 15.0％,while moderate harrowing BSCs reduced runoff by 29.3％ and increased infiltration by 36.6％ and severe-harrowing BSCs reduced runoff by 9.6％ and increased infiltration by 14.4％.(3)The harrowing BSCs had significant effects on sediment.Compared to the control,mild-harrowing BSCs reduced sediment by 54.8％,moderate-harrowing BSCs reduced sediment by 45.5％ and severe-harrowing BSCs reduced sediment by 10.4％.Considering the changes of infiltration and soil erosion,we can conclude that BSCs with mild and moderate harrow intensity could promote infiltration,reduce runoff and improve soil moisture conditions without leading to obvious increases of soil erosion.
biological soil crustsharrowinginfiltrationrunoff and sediment
国家科技期刊平台
NSTL
万方数据
维普
