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RESEARCH AND PROSPECTS FOR SOIL RESPIRATION OF FARMLAND ECOSYSTEMS IN CHINA REVIEW OF SPATIAL AND TEMPORAL VARIATIONS OF SOIL RESPIRA- TION AND DRIVING MECHANISMS The spatial and temporal variations of maximum light use efficiency and possible driving factors of Croplands in Jiangsu Province Dynamic Monitoring of Vegetation Coverage in Three Gorges Reservoir Area Based on MODIS NDVI Spatial and temporal variations of total nitrogen density in agricultural soils of the Songnen Plain Maize Belt Spatial and Temporal Variations of Water Poten tia l of theMa in Tree Spec iesfor Vegeta tion Restora tion in the Dry-hot Va lleys of the Jin sha River