SOIL WATER HOLDING CAPACITY AND SOIL AVAILABLE WATER IN PLANTATIONS IN THE LOESS REGION Soil Water Holding Capacity of Plantations Rehabilitated on Severely Eroded Lands in Tropical China Study on Water-Holding Capacity of the Top Soil of a Steppe Reserve in the Yunwu Mountains, Guyuan, Ningxia Hui Autonomous Region Effects of continuous planting rotation on forest structural characteristics and water holding capacity of Eucalyptus plantations