The Effects of Interplant Different Herbage on Soil Water in Apple Orchards in the Area of Weibei Plateau The Effects of Interplant Different Herbage on Soil Water in Apple Orchards in the Area of Weibei Plateau Influences of Interplanting Herbage on the Soil Respiration of Apple Orchard in Weibei Loess Plateau Effects of Interspecific Interaction on the Growth and Distribution of Roots in Apple-White Clover Intercropping System