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《Geochimica》 2009-06
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Influence of land use change on dissolved inorganic carbon and stable isotopic compositions of karst groundwater

ZHAO Min1,2,ZENG Cheng3 and LIU Zai-hua1,2,3 1.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;2.Puding Comprehensive Karst Research and Experimental Station,Institute of Geochemistry,Chinese Academy of Sciences and Guizhou Science and Technology Dep artment,Puding 562109,Guizhou,China;3.Karst Dynamics Laboratory,MLR,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,China  
Influences of land use change on the dissolved inorganic carbon(DIC) of karst groundwater has implications for estimating the intensity of karstification and the karst-related global carbon cycle.In this paper,DIC and stable carbon isotopic compositions of ground waters under three different land use conditions,which are Banzhai karst groundwater in the virgin forest of Maolan,Chenqi and Dengzhanhe spring waters in Puding County,where karst rocky desertification developed severely,were analyzed.The results show that the DIC of groundwater was mainly in the form of.Because of the dilution effect,the concentration was lower in rainy season for the Banzhai and Dengzhanhe karst areas with little soil cover.However,because of the stronger soil CO2 effect compared to dilution effect,the concentration was higher in rainy season for the Chenqi karst area with greater soil cover.This difference shows that soil cover plays a very important role in the karstification.In addition,the values of δ13 CDIC in summer were 1‰-2‰ lower than those in winter due to larger biomass effect in summer.With respect to the effect of different land use,the δ13CDIC values of groundwater under areas with karst rocky desertification were 2.5‰-3.0‰ higher than those under virgin forest.With the development of karst rocky desertification,soil losses became more serious,and the δ13CDIC values of groundwater were getting higher.This reflects the combined effect of biomass reduction and more atmospheric CO2 input under karst rocky desertification,both of which increased the δ13CDIC values of groundwater.
【Fund】: 中国科学院百人计划项目;; 中国科学院知识创新工程重要方向项目(KZCX2-YW-306);; 国家自然科学基金(40872168);; 国家社会公益项目(2005DIB3J067);; 科技部国家重点实验室专项资助项目
【CateGory Index】: P595
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