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Gray Forecast on the Optimal Extension Deadline of the Compensation Polity for Conversion of Farmland to Forestry Project in Western China ECOHYDROLOGICAL EFFECT OF TROPICALNOUNTAIN RAIN FOREST ON JIANFENGLING,HAINAN ISLAND ——CANOPY LEACHING AND HYDROCHEMICAL STORAGE Dynamic trend analysis of land use change in the ganjiang upstream watershed by using RS and GIS techniques