酸雨溶蚀碳酸盐岩的源汇效应分析——以广西典型岩溶区为例

发布时间：2018-04-04 14:30

本文选题：酸雨　切入点：岩溶作用　出处：《中国岩溶》2017年01期

【摘要】：选取广西的桂林、柳州、河池、百色、玉林、南宁、钦州7个酸雨监测点进行了为期一年(2014年5月至2015年5月)的监测,结合各站点溶蚀试片和降雨降雨量、降雨时间、pH值和电导率等,分析了试片溶蚀量的主要影响因素及酸雨的源汇效应。结果表明,试片溶蚀量与累计降雨时间,即溶蚀作用发生的时间关系密切。单场酸雨对碳酸盐岩的溶蚀过程可分为两个阶段,即:前期强酸溶蚀碳酸盐岩,释放CO_2,为碳源;后期碳酸溶蚀碳酸盐岩,吸收大气CO_2,为碳汇。而就整年而言,碳汇过程占绝对优势,酸雨减汇量仅占总溶蚀量的0.27%~3.52%,平均为1.96%,但酸雨减汇比例随酸雨pH值的降低而呈指数增加。酸雨对岩溶碳汇有着显著影响,在岩溶碳汇的研究中不应忽视。
[Abstract]:Seven acid rain monitoring sites in Guangxi, Guilin, Liuzhou, Hechi, Baise, Yulin, Nanning and Qinzhou, were selected to monitor acid rain for a period of one year (May 2014 to May 2015).The precipitation time, pH value and conductivity are analyzed. The main factors affecting the dissolution amount of the sample and the effect of acid rain source and sink are analyzed.The results show that the dissolution of the specimen is closely related to the accumulated rainfall time, that is, the time of dissolution.The dissolution process of carbonate rocks by single acid rain can be divided into two stages: strong acid dissolution carbonate rocks in the early stage and CO _ 2 released from carbonate rocks as carbon source; carbonate rocks dissolved in carbonate rocks in late stage absorb atmospheric CO _ 2, which is a carbon sink.For the whole year, the carbon sequestration process accounts for the absolute predominance, and the acid rain sequestration only accounts for 0.27% of the total dissolved amount, with an average value of 1.96, but the proportion of acid rain sequestration increases exponentially with the decrease of the pH value of the acid rain.Acid rain has a significant effect on karst carbon sinks, which should not be ignored in the study of karst carbon sinks.
【作者单位】：中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学重点实验室;广西壮族自治区气象局;西南大学地理科学学院;
【基金】：国家自然科学基金项目(41402238,41402324) 地质调查项目(12120113005100)
【分类号】：X517;P642.25

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