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Influences of Land Use/Land Cover on Hydrogeochemical Indexes of Karst Groundwater in the Dagouhe Basin, Southwest China
Author(s) -
Lan Funing,
Qin Xiaoqun,
Jiang Zhongcheng,
Meng Rongguo,
Mo Risheng,
Yang Shengmeng,
Wang Wenjuan,
An Shuqing
Publication year - 2015
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201300872
Subject(s) - karst , hydrology (agriculture) , groundwater , environmental science , carbon sink , sink (geography) , land cover , total organic carbon , structural basin , land use , geology , climate change , ecology , environmental chemistry , geomorphology , oceanography , geography , chemistry , paleontology , geotechnical engineering , cartography , biology
It is essential to understand how karst groundwater hydrogeochemistry responds to watershed land use and land cover changes. However, little information is available on this response in the karst region of southwest China. Water temperature, pH, electrical conductivity, total organic carbon (TOC), ions concentration, CO 2 pressure (pCO 2 ), calcite saturation index (SI C ), stable carbon isotopic compositions of dissolved inorganic carbon (δ 13 C DIC ), and carbon sink ability were monitored during the hydrological year of May 2010 to April 2011 in the eastern and western areas of Dagouhe Basin. The two areas share the same climatic condition but show different land use/land cover. Field data were used to calculate pCO 2 , SI C , and karst carbon sink density. The results showed higher ion concentrations, TOC, carbon sink ability, pCO 2 and lower pH, SI C , δ 13 C in the groundwater of the eastern area than those in the western area. In the eastern area, there is larger forest and farmland coverage, both produced and kept more biological carbon sources and lower δ 13 C in the soil‐vadose zone. While in the western area, there is larger rocky land and wasteland coverage. All results suggested that land use and land cover pattern played very important roles in this basin. Therefore, the hydrogeochemical indexes selected could be good indicators for the land use/cover change in the studied basin.