Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China
文献类型：期刊论文
| 作者 | Yan JH ; Li JM ; Ye Q ; Li K |
| 刊名 | chemical geology
 |
| 出版日期 | 2012 |
| 卷号 | 304页码:1-9 |
| 关键词 | GLOBAL CARBON-CYCLE WATER CHEMISTRY ATMOSPHERIC CO2 RIVER LAND SEQUESTRATION DIOXIDE IMPACT AREAS SINK |
| ISSN号 | 0009-2541 |
| 通讯作者 | yan jh |
| 中文摘要 | chemical concentrations and export rates from surface water were analyzed in houzhai karst basin (hkb, area 80.65 km(2) in total), southwest china, for the past two decades from 1986 to 2007. surface water chemistry was dominated by ions of calcium (ca2+), magnesium (mg2+), bicarbonate (hco3-) and sulfate (so42-). which together made up 96% (by weight) of the total dissolved solids measured in this study. seasonal variability of chemical export rates was positively correlated with surface runoff discharge, with the concentrations generally diluting at high discharge. from 1986 to 2007, as a result of the responses of karst weathering to climatic factors, the concentrations of ca2+, mg2+, hco3-, and so42- slowly increased in surface water. by contrast, changes in the concentrations of sodium (na+), potassium (k+), and chloride (cl-) showed a slowly decreasing pattern. we also found that the annual dissolved inorganic carbon (dic) flux ranged from 10.1 to 34.1 g c m(-2) yr(-1), with an average value of 242 g c m-2 yr(-1). rainfall had the most important influence on dic flux, although water ph may greatly affect the proportions of the three fractions (co2, hco3-, co32-) of dic. high water temperature in the wet season may reduce the solubility of co2 in water and consequently affect dic export rate, but this effect is much smaller than that of rainfall. based on the chemical mass balance in surface water, our results indicate that high concentrations of so42- by the large gypsum (caso4 center dot 2h(2)o) dissolution offset some anions such as hco3- in karst water, which can partly explain why carbon uptake is often overestimated by the empirical model using concentrations of hco3- in this karst water. it is concluded that the fluvial flux of dic from karst water is important to the regional or national carbon budgets. (c) 2012 elsevier b.v. all rights reserved. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000303098900001 |
| 公开日期 | 2013-05-22 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/48211]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Yan JH,Li JM,Ye Q,et al. Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China[J]. chemical geology,2012,304:1-9. |
| APA | Yan JH,Li JM,Ye Q,&Li K.(2012).Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China.chemical geology,304,1-9. |
| MLA | Yan JH,et al."Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China".chemical geology 304(2012):1-9. |
入库方式： OAI收割
来源：长春应用化学研究所
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