碳酸盐岩的化学风化与失踪碳汇的关系:以贵州红枫水库流域为例
On the Relationship between Chemical Weathering of Carbonate Rocks and the Missing Carbon Sinks: A Case Study on the Watershed of the Hongfeng Reservoir, Guizhou Province, Southwest China
查看参考文献67篇
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文摘
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为探讨碳酸盐岩的化学风化与失踪碳汇之间的关系,以中国西南贵州省红枫水库流域的麦翁河、羊昌河、麻线河和后六河流域为研究对象,通过主离子化学和溶解无机碳(DIC)及其碳同位素组成(δ~(13)C_(DIC))计算出碳酸风化硅酸盐岩、硫酸风化碳酸盐岩和碳酸风化碳酸盐岩对DIC的贡献分别为10%、30%和60%。麦翁河流域硫酸风化碳酸盐岩释放CO_2,其C释放速率为11.2 g·m~(-2)·a~(-1)。综合评估了岩性、水文、植被、农业、采煤、大气CO_2浓度对风化作用的影响及工业革命前后这些因素的变化,认为该流域碳酸盐岩的化学风化不能作为失踪碳汇。模拟计算的河流自然汇合后的风化通量和速率与各条河流单独采样计算的结果差别很大,说明传统的采样点布设方式和使用的空间尺度的合适性需要重新评估。 |
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其他语种文摘
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It is open to discussion whether or not the carbonate weathering is a candidate for the missing carbon sinks. Here, we reported a dataset of hydrochemistry and carbon isotopes of DIC for the four rivers in the Hongfeng Reservoir watershed, Guizhou Province, Southwest China. The weathering processes of carbonate by sulfuric acid, of carbonate by carbonic acid and of silicate by carbonic acid were found to contribute 30%, 60% and 10% of DIC in the watershed, respectively, and the CO_2 consumption rate in the watershed was estimated to be about 5.01×10~5 mol·km~(-2)·a~(-1). By comparing the variations of weathering-controlling factors (e. g. lithology, hydrology, vegetation agriculture, coal mining and atmospheric CO_2) during pre- and post-industrial times, it could be concluded that the carbonate weathering in the study watershed cannot be regarded as a missing carbon sink. The calculated weathering rates and fluxes by two different methods, one by adding up results obtained from individual rivers while another one by deriving hydrochemical data of the confluence of the four rivers, were different significantly, indicating that evaluations on the traditionally-used sampling site assignment and the spatial scale are much needed. |
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来源
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矿物岩石地球化学通报
,2020,39(5):999-1013 【核心库】
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DOI
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10.19658/j.issn.1007-2802.2020.39.076
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关键词
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碳酸盐岩
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硅酸盐岩
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化学风化
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溶解无机碳
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失踪碳汇
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人类活动
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红枫水库
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地址
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1.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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国家重点研发计划项目
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国家自然科学基金项目
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文献收藏号
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CSCD:6822226
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