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在长时间尺度上,碳酸盐岩的形成对地质历史时期大气CO2产生巨大的碳汇效应,同时碳酸盐岩在全球分布面积的巨大及对气候变化响应的敏感,使碳酸盐岩溶蚀、吸收大气/土壤CO2的岩溶过程积极参与现代全球碳循环,并发挥重要作用,已有的研究结果显示这一碳汇的通量约占全球“遗漏汇”的12.00%～35.29%.以珠江流域为例,在综合考虑影响岩溶作用及产生碳汇因子的基础上,收集已有数据,以典型地点的石灰岩溶蚀速率、年降水量、土壤呼吸速率和NPP建立回归方程,并以GIS为研究平台,结合研究区内碳酸盐岩类型的分布,估算研究区内因碳酸盐岩溶蚀作用对大气CO2汇的通量.结果表明,珠江流域年溶蚀量为1.54×107tCaCO3/a,折合碳为1.85×106tC/a,试图从原位典型点的监测数据,探索区域尺度岩溶作用碳汇估算方法.
On a long time scale, the formation of carbonate rocks has a great carbon sink effect on atmospheric CO2 during geological history. At the same time, carbonate rocks have a large global distribution area and are sensitive to climate change, , The karst process that absorbs atmospheric / soil CO2 actively participates in the modern global carbon cycle and plays an important role. Previous studies have shown that this carbon sink flux accounts for 12.00% -35.29% of the global “missing sinks”. Taking Pearl River Basin as an example, the existing data are collected and the regression equation of limestone dissolution rate, annual precipitation, soil respiration rate and NPP are established based on the comprehensive consideration of factors affecting karstification and carbon sink generation. Based on GIS As the research platform, the fluxes of atmospheric CO2 sinks due to carbonate dissolution in the study area are estimated based on the distribution of carbonate types in the study area.The results show that the annual erosion amount of the Pearl River Basin is 1.54 × 107tCaCO3 / a, which is equivalent to Carbon is 1.85 × 106tC / a, trying to explore the estimation method of regional carbon sink on karst from the monitoring data of the typical in situ sites.