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NODULE CHARACTERISTICS OF THREE-YEAR-OLD CARAGANA MICROPHYLLA AND THEIR RESPONSES TO ENVIRONMENTAL CHANGES IN AN INNER MONGOLIA GRASSLAND Components of soil respiration and its temperature sensitivity in four types of forests along an elevational gradient in Shennongjia, China Relationship between soil denitrifying enzyme activities and N2O emission Soil CO2 Release Rate and Its Effect Factors in Chinese Fir Plantation Variations of soil respiration rate and its temperature sensitivity among different land use types in the agro-pastoral ecotone of Inner Mongolia Response of Soil Respirations to Litterfall Exclusion and Addition in Pinus massoniana Plantation in Hunan, China The responses and mechanisms of water use efficiency to different water stresses of three alfalfa varieties