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Influence of Soil Water Content on Vegetation Characteristics in Desert-Wetland Ecosystem in Xihu of Dunhuang,Gansu Effects of Stipa bungeana on Soil Water Contents and Nutrients of Sloping Lands in Loess Plateau of China Responses of contents of soil nutrient factors and water to stocking rates for yaks in Kobresia parva alpine meadow Ⅰresponses to contents of soil nutrient factors and water to stocking rates in summer pasture Concentration and distribution of phenolic compounds in Populus euphratica in Ejina oasis and their correlation with soil water contents