典型地下河流域不同岩性外源水碳汇原因及效应研究

In view of the allogenic water supply are widespread in many underground rivers in karst regions in southwest in China, but causes and effects of carbon sink of allogenic water from different rocks and other frontier science problem are Don't know , choose Wan Huayan underground river in hunan chenzhou and MAO village underground river in guangxi guilin GuYi underground river in guangxi liujiang river, three typical karst underground river basin as study area. With the earth system science theory as the instruction, using the advanced field monitoring and laboratory analysis, research on cause and rate of chemical weathering in silicate rock area and additional effects of carbon sink for typical karst basins as allogenic water supply ; based on GEM - CO2model and Galy model, according to the characteristics of the karst basin, established carbon sink evaluation model considering allogenic water supply in the karst basin, the quantitative evaluation of karst basin karst carbon sink effect and the contribution of allogenic water, aims to reveal the geochemistry functions of silicate rock in the recharge area and the cause and rate of formation of carbon sink in the karst basin .The evaluation model and method of karst carbon sink effect for scientific evaluation of land in karst basin and typical research achievements provide technical methods, to further promote the weathering of rocks and the global carbon cycle in a river basin.

针对我国西南岩溶地区很多地下河普遍存在外源水补给，但外源水循环的碳汇效应及其原因不清等前沿科学问题，选择具有代表性的湖南郴州万华岩、广西桂林毛村地下河和广西柳江古益地下河3个典型岩溶地下河流域作为研究区，以地球系统科学理论为指导，利用先进的野外现场监测和室内测试分析技术，研究岩溶流域外源水补给区硅酸盐岩化学风化作用产生的原因和速率，外源水在岩溶流域增加产生的岩溶作用效果；在GEM-CO2模型和Galy模型基础上，针对岩溶流域的特点，建立考虑外源水补给的岩溶流域碳汇评价模型，定量评价岩溶流域岩溶碳汇效应及其外源水的贡献，旨在揭示流域硅酸盐岩补给区产生的岩溶地球化学作用的原因及速率，形成考虑外源水补给条件下的岩溶流域碳汇评价模型及方法，为科学评价陆地岩溶流域岩溶碳汇效应提供技术方法和典型研究成果，以进一步推动流域岩石风化作用与全球碳循环研究。

针对我国西南岩溶地区很多地下河普遍存在外源水补给，但外源水循环的碳汇效应及其原因不清等前沿科学问题，选择具有代表性的湖南郴州万华岩、广西桂林毛村地下河和广西柳江龙寨地下河3个典型岩溶地下河流域作为研究区，研究岩溶流域外源水补给区硅酸盐岩化学风化作用产生的原因和速率。针对岩溶流域的特点，定量评价了3个小岩溶流域岩溶碳汇效应及其外源水的贡献，万华岩地下河系统岩石风化消耗 CO 2 的速率为 31.02t/km 2 •a；外源水汇入后碳酸盐岩溶蚀碳汇量可以增加1倍。揭示流域硅酸盐岩补给区产生的岩溶地球化学作用的原因及速率。为科学评价陆地岩溶流域岩溶碳汇效应提供技术方法和典型研究成果，进一步推动了流域岩石风化作用与全球碳循环研究。