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Impact Factors to Soil Moisture of Alpine Meadow and Their Spatial Heterogeneity

WANG Jun-de~(1),WANG Gen-xu~(1,2),CHEN Ling~(1) (1.National Laboratory of Western China's Environmental Systems,Lanzhou University,Lanzhou Gansu 730000,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
Nine environmental factors which influence the soil moisture of alpine meadow are analyzed through rotated principal component analysis,such as community's height,depth of root system of soil layer,land use pattern,etc.The analyses show that these environmental factors can be divided into four principal compositions successively: factors of plant,vegetation,slope,elevation,wind speed and topography.At the same time,using the software of counting,statistics of soil moistures for different depths are made and then the spatial heterogeneity of soil moistures is revealed.An overall soil section can be divided into speedy changing layer,changeful layer,second-changeful layer and relative stable layer from the top to the bottom.
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