Response of dissolved inorganic carbon (DIC) and delta C-13(DIC) to changes in climate and land cover in SW China karst catchments

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	Response of dissolved inorganic carbon (DIC) and delta C-13(DIC) to changes in climate and land cover in SW China karst catchments
	Min Zhao; Zaihua Liu; Hong-Chun Li; Cheng Zeng; Rui Yang; Bo Chen; Hao Yan
刊名	Geochimica Et Cosmochimica Acta
	2015
卷号	165 期号:1 页码:123-136
英文摘要	Monthly hydrochemical data and δC of dissolved inorganic carbon (DIC) in karst water samples from September 2007 to October 2012 were obtained to reveal the controlling mechanisms on DIC geochemistry and δCunder different conditions of climate and land cover in three karst catchments: Banzhai, Dengzhanhe and Chenqi, in Guizhou Province, SW China. DIC of karst water at the Banzhai site comes mainly from carbonate dissolution under open system conditions with soil COproduced by root respiration and organic carbon decomposition with lowest δC values under its dense virgin forest coverage. Weaker carbonate bedrock dissolution due to sparse and thin soil cover results in lower δC, pCO, DIC and EC, and lower cation and anion concentrations. At the Chenqi site, larger soil COinput from a thick layer of soil results in high pCOand DIC, and low pH, SIand δCin the karst water. At the Dengzhanhe site, a lesser soil COinput due to stronger karst rock desertification and strong gypsum dissolution contribute to higher δC, high EC and high cation and anion concentrations. Soil COinputs, controlled by biological activity and available soil moisture, carbonate bedrock dissolution, dilution and degassing effects, vary seasonally following rainfall and temperature changes. Consequently, there are seasonal cycles in hydrochemistry and δCof the karst water, with high pCOand low pH, EC, SI, and δCvalues in the warm and rainy seasons, and vice versa during the cold and dry seasons. A strongly positive shift (>3‰) in δCoccurred in the drought year, 2011, indicating that δCin groundwater systems can be an effective indicator of environmental and/or climate changes.
学科主题	环境地球化学
语种	英语
公开日期	2017-05-17
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6051]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Min Zhao,Zaihua Liu,Hong-Chun Li,et al. Response of dissolved inorganic carbon (DIC) and delta C-13(DIC) to changes in climate and land cover in SW China karst catchments[J]. Geochimica Et Cosmochimica Acta,2015,165(1):123-136.
APA	Min Zhao.,Zaihua Liu.,Hong-Chun Li.,Cheng Zeng.,Rui Yang.,...&Hao Yan.(2015).Response of dissolved inorganic carbon (DIC) and delta C-13(DIC) to changes in climate and land cover in SW China karst catchments.Geochimica Et Cosmochimica Acta,165(1),123-136.
MLA	Min Zhao,et al."Response of dissolved inorganic carbon (DIC) and delta C-13(DIC) to changes in climate and land cover in SW China karst catchments".Geochimica Et Cosmochimica Acta 165.1(2015):123-136.