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Soil water holding capacity under four typical ecosystems in Wuyunjie Nature Reserve of Hunan Province A study on the available water potentialities“Brought by the stand itself ”in the loess plateau forest land——A new hypothesis developed SOIL WATER HOLDING CAPACITY AND SOIL AVAILABLE WATER IN PLANTATIONS IN THE LOESS REGION Study on Water-retention Characters of Maowusu Sandy Soil Analysis of oasis evolution and suitable development scale for arid regions: a case study of the Tarim River Basin STUDY ON INTERACTIVE MECHANISM BETWEEN SOIL AVAILABLE WATER AND FERTILIZERS AND ITS APPLICATIONⅠ. The Salt Index of Fertilizers