Soil physical and chemical properties of different mix-sown combination pasture

The soil physical and chemical properties of 0－20 cm soil lay in mix-sown pasture which has been constructed 3 years by six different kinds of Legumionosae and Gramineae herbage (Vicia tenuifolia, Medicago sativa, Onobrychis viciaefolia, Phleum pretense, Agropyron cristatum, Dactylis glomerata) were studied. The mix-sowed type numbers were 3, 4, 5, 6 and proportion of Legumionosae and Gramineae was 4∶6. The results showed that all mix-sown combinations had different impacts on soil physical and chemical properties comparing with CK. The water content in 0－10 cm soil, bulk density of T1 (V.tenuifolia+M.sativa+O.viciaefolia+P.pretense+A.cristatum+D.glomerata) and T3 (V.tenuifolia+O.viciaefolia+P.pretense+A.cristatum+D.glomerata) were significant higher (P0.05) than that of the control. In 0－20 cm layer, the soil organic matter, available nitrogen, available phosphorus, available potassium of T1 and T3 were significant higher than that of other mix-sown combinations and control (P0.05). The results indicated T1 and T3 treatment were more beneficial for maintaining grassland soil stability and suitable for local and similar habitat conditions.