| On the condition of natural raining, the effects of White Clover(Trifolium), Perennial Ryegrass (Lolium perenne) and alfalfa (Medicago sativa) on soil water content in Cabernet Sauvignon vineyard were studied. The results indicated that green coverings improved soil physical characteristics, soil bulk density decreasing by 5.68% and the soil porosity increasing by 6.15%. While soil water content under green coverings was obviously reduced, among 3 kinds of grass, White Clover (Trifolium repens) reduced soil water content evidently and Alfalfa (Medicago sativa) affected it weakly in root zone. |