NDLI: Study on the hydrochemistry character and carbon sink in the middle and upper reaches of the Xijiang River basin, China

Content Provider	Springer Nature Link
Author	Yu, Shi Du, Wenyue Sun, Pingan He, Shiyi Kuo, Yiming Yuan, Yaqiong Huang, Jie
Copyright Year	2014
Abstract	In order to explore the change process and law of carbon sinks flux in the middle and upper reaches of the Xijiang River basin, the research workers discuss the influencing factors of carbon sinks flux in the study area under natural process and impact of human activity. The hydrologic station at Wuzhou was taken as the research object. River water was sampled and measured regularly from April 2011 to March 2012 three times per month (intensive measurements and sampling were carried out during the heavy rainfall period), and then river water samples were analyzed. The following results are shown: (1) The chemistry of water revealed that the middle and upper reaches of the Xijiang River basin comprised the HCO$_{3}$ $^{−}$Ca type; in total anions, both HCO$_{3}$ $^{−}$ and Ca$^{2+}$ comprised 69 % and 75.9 %, respectively, as a result of carbonate rock weathering. (2) The content of NO$_{3}$ $^{−}$ and SO$_{4}$ $^{2−}$ was high, which might be the result of human activities, such as agriculture and industry. Moreover, sulphuric acid is involved in dissolution of carbonate minerals, and missing sink that is caused by exogenous acid is indispensable. (3) The annual total carbon flux was 6664.45 × 106 kg CO$_{2}$; the carbon flux in flood season and non-flood season accounted for 58.25 and 41.75 % of carbon sinks of karst water, respectively. Correspondingly, the intensity of carbon sinks was 1694.48 and 1214.53 kg/mon km$^{2}$, respectively. (4) Discharge was the primary factor of the intensity of carbon sinks and carbon flux; other influential factors, such as inorganic carbon and biological pump, had less influence on the intensity of carbon sinks and carbon flux. These conclusions are theoretically important and practically significant for estimating the carbon sink in Xijiang basin accurately. This study is a scientific basis for exploiting and protecting water resources.
Starting Page	997
Ending Page	1005
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	2
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Xijiang The middle and upper reaches Hydrochemistry Carbon sink Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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