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Soil microbial properties under different grain-for-green patterns in depressions between karst hills Plant community characteristics and its coupling relationships with soil in depressions between karst hills, North Guangxi, China Carbon storage and its controlling factors under different vegetation types in depressions between karst hills, southwest China Characteristics of soil fertility in different ecosystems in depressions between karst hills Dynamics of nutrient elements in different types of forests in depressions between karst hills