Strontium concentrations and isotope ratios in a forest-river system in the South Qinling Mts., China

WATER RESEARCH

卷:93

Article

Bu, Hongmei¹  Song, Xianfang¹  Zhang, Quanfa²  Burford, Michele A.³ 

[1] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China

[2] Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China

[3] Griffith Univ, Australian Rivers Inst, Nathan, Qld 4111, Australia

关键词: Forested catchment;    Sr;    Sr-87/Sr-86;    Ca/Na;    Ca/K;    Source contribution;   

DOI  :  10.1016/j.watres.2016.01.061

来源: Elsevier

【 摘 要 】

The concentrations of dissolved strontium (Sr) and isotope ratios (Sr-87/Sr-86) in rainwater, river water, and water from forest soil are measured to investigate the contributions of these sources to a river during base flow conditions in the relatively pristine South Qinling Mountains, China. Dissolved Sr concentrations and 87Sr/86Sr ratios vary significantly between different water types (p < 0.01) suggesting that it is suitable for differentiating sources. Dissolved Sr is also positively correlated with most ions and a range of physicochemical parameters (p < 0.01 and p < 0.05 respectively) in water samples including Ca2+, Mg2+, EC, and TDS (p < 0.001) indicating their similarities in the drivers of biogeochemical processes and common origins. The correlations between Sr isotopes and Ca/Na, Ca/K, and 1000/Sr ratios suggest that three end-members of atmospheric inputs, carbonate and silicate weathering control the Sr water chemistry in the river water. Using the three-source mixing model, atmospheric inputs, carbonate, and silicate weathering contribute 74%, 20%, and 6% respectively to the dissolved Sr in the river water. This research has provided new insights into the contribution of sources of Sr to a river system in a mountainous catchment. (C) 2016 Elsevier Ltd. All rights reserved.

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