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Status, degraded causes and comprehensive treatment of Dunhuang Xihu wetland ecosystem On the eco-system service function in island and its protection countermeasures Application of ‘closed-opened coupling’ theory in the eco-economy development of West China Discussion of Problems in Agro-eco-system Assessment The Characteristics of Farmland Terra Nera Ecosystem Analysis of the integrated ecosystem of farming，forestry and animal husbandary in Kaifeng sandy experimental region PRELIMINARY STUDY ON THE RESTORATION OF SUBTROPICAL MONSOON EVERGREEN BROAD-LEAVED FOREST IN WUHUA COUNTY, GUANGDONG PROVINCE