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Inside Bark Diameter Prediction Models for Dahurian Larch Meadow conservation and optimal utilization of the alpine wetland in the Western China Principles and Optimal Models for Development of Maowusu Sandy Crassland Optimal models on sustainable management of oases ecosystem in southern margin of Taklamakan Desert 0ptimal models of agro-forestry ecosystem—A case study from Raoyang County of Hebei Province