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ECOLOGICAL REGIONALIZATION OF ARID LANDS IN NORTHWESTERN CHINA Optimized eco-productive paradigm for mountain-basin system in Huailai County, Hebei Province Ecological Restoration and Sustainable Agricultural Paradigm of Mountain-Oasis-Ecotone-Desert System in the North of the Tianshan Mountains A review on the study of optimized eco-productive paradigm in the farming-pastoral zone of North China Establishment of Optimized Eco-productive Paradigm in the Farming-Pastoral Zone of Northern China