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通过对地表化学径流组成的分析,应用化学物质平衡法和扣除法对增江流域化学风化过程产生的大气CO2吸收通量进行估算.结果表明:在碳酸盐岩地层不纯且分布面积较少的增江流域,径流溶解质主要由HCO3-,Ca2+,Na+和溶解性Si组成;硅酸盐矿物的化学风化过程是增江河流溶解质的主要来源,其次是碳酸盐矿物化学风化过程的贡献.大气CO2是增江流域岩石化学风化的主要侵蚀介质.增江流域岩石化学风化过程对大气CO2的吸收通量是(3.50～3.81)×105molkm-2a-1,仅比热带-亚热带玄武岩和碳酸盐岩流域低,高于温带-寒温带流域化学风化过程对CO2的吸收通量.受湿润季风环流影响的北半球中低纬度带地表化学风化过程构成全球生物地球化学循环的一个重要碳汇.
Through the analysis of surface chemical runoff composition, the atmospheric CO2 absorption fluxes produced by the chemical weathering in the Zengjiang River Basin are estimated by the chemical balance method and the deduction method.The results show that when the carbonate rock formation is impure and its distribution area is small Of the Zengjiang River. The runoff dissolved matter mainly consists of HCO3-, Ca2 +, Na + and dissolved Si. The chemical weathering of silicate minerals is the main source of dissolved matter in rivers and streams, followed by the chemical weathering of carbonate minerals Contribution.The atmospheric CO2 is the main erosion medium of petrochemical weathering in the Zengjiang watershed.The absorption flux of atmospheric chemical and chemical processes in the Zengjiang watershed is (3.50 ~ 3.81) × 105molkm-2a-1, which is only higher than that of the tropical-subtropical basalts and Carbonate basins are lower and higher than CO2 fluxes in chemical and weathering processes in the temperate and boreal temperate basins.The surface chemical weathering process in the middle and low latitudes of the northern hemisphere affected by the humid monsoon circulation constitutes an important carbon sink in global biogeochemical cycles .