Analysis on Soil Moisture Character of Dry Orchard on Hilly and Gully Regions on the Loess Plateau

Soil water characters are often complex,this paper presents a new framework on the soil water condition,also the traditional analysis method is practiced to illustrate the temporal spatial variation and the wane degree of different oriental orchard slope of the hill gully region of the Loess Plateau.The 0~200 cm depth water reserve of the orchard grade surface is 314.7 mm.28.8% lower than the sloping field.The soil moisture storage capacity affected by precipitation assumes an annual fluctuation and this fluctuation presents an obvious hysteretic nature.The soil moisture content,had a wider variation with the difference of the aspect and slope location,provides us different stages in a year: a slow accumulation in autumn and winter,an intense consumption in early summer and late spring.Soil moisture content is also affected by kinds of factors such as precipitation,and it is lower than the suitable field moisture capacity from Apr.to Sept.every year.