The effect of vegetation restoration on soil stable infiltration rates in small watershed of loess gully region
黄土丘陵沟壑区小流域植被恢复对土壤稳定入渗的影响

Changes occurred in soil stable infiltration rate,soil water stable aggregate and soil organic matter by stopped grazing in loess gully region of China.Data including soil stable infiltration rate,soil water stable aggregate and soil organic matter was collected through field experiments for present ecological study.Statistical analysis revealed that the soil stable infiltration rates vary significantly among different plant communities.And among communities having different plant life forms,the stable infiltration rates under bush and grass communities are faster than those under forest communities.Results of regression analysis include:(1)the soil stable infiltration rate has significant linear correlation with soil bulk density,total porosity and valid porosity;(2)the soil stable infiltration rate has linear correlation with layer thickness of fallen leaves and humus on soil surface;and(3)the soil stable infiltration rate has linear correlation with the content of soil humus and water stable aggregate.In loess gully region,bush and grass are superior vegetations than forest for ecological restoration,and among bush and grass plants,Artemisia sacrorum,Artemisia giraldii,Caragana korshinski,Stipa bungeana and Bothriochoa ischemum are superior plants for vegetation building.Although some trees can be planted for vegetation reconstruction in this region,yet,the forestation density,vegetation structure and site choice are also critical to forestation.