Spatial distribution of soil organic carbon in apple orchards on Loess Tableland Soil water in deep layers under different land use patterns on the Loess Tableland Water Storage, Sediment Reduction and Hydraulic Parameters as Affected by Vegetation on Earth Roads in the Gully Area of the Loess Tableland Analysis of stable isotopic composition and vapor source of precipitation at the Changwu Loess Tableland Evapotranspiration Characteristics of Apple Orchard at Peak Period of Fruiting in Loess Tableland