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Study on riparian zone and the restoration and rebuilding of its degraded ecosystem Reasons of Damage of Forest by the Ice and Snow,the Loss Evaluation as well as Suggestions on Reestablish ment of Forests after the Disaster in Hunan Province The rebuilding and resuming of SD model of the eco-environment in the agriculture and animal husbandry interlock zone along the Great Wal Measures of Restoring and Rebuilding Desertified Grassland