辽河流域岩石风化速率及碳汇计算  

Rock Weathering Rates and Carbon Sink Calculation in Liaohe River Watershed,China

作　　者：彭弋倪 陈旸[1,2,3] 李石磊[1,2] 

机构地区：[1]南京大学表生地球化学教育部重点实验室,江苏南京210023 [2]南京大学地球科学与工程学院,江苏南京210023 [3]江苏省气候变化协同创新中心,江苏南京210023

出　　处：《地球科学与环境学报》2017年第3期439-449,共11页Journal of Earth Sciences and Environment

基　　金：中国地质调查局地质调查项目(12120113005400);国家自然科学基金项目(41321062)

摘　　要：岩石风化是全球碳循环的重要碳汇过程。以辽河流域为研究对象,采用水化学与元素地球化学方法,从河流水化学角度对整个辽河流域的岩石风化过程进行研究。在对流域干流和主要支流河水以及水库水的水化学特征进行统计分析后,通过正演方法计算发现,辽河流域河水化学组成主要由岩石风化主导,岩石风化以碳酸盐岩风化为主,但受到人类活动(畜牧业、农业、工业等)的影响很大。辽河流域碳酸盐岩风化速率为每年12.99t·km^(-2),硅酸盐岩风化速率为每年2.27t·km^(-2),岩石风化速率小于大陆河流平均水平。辽河流域碳酸盐岩风化CO_2消耗通量为每年14.66×10~9mol,硅酸盐岩风化CO_2消耗通量为每年6.40×10~9 mol,都小于世界大部分大陆河流。Rock weathering is an important carbon sink process in global carbon cycle.The rock weathering process in Liaohe river watershed was studied with the methods of water chemistry and element geochemistry.The hydrochemical characteristics of main river and reservoir waters in Liaohe river watershed were analyzed.Based on the forward method model,the chemical composition of river water in Liaohe river watershed is dominated by rock weathering,which is mainly affected by carbonate weathering and human activities（livestock breeding,agriculture,industry,etc.）.The carbonate weathering rate in Liaohe river watershed is 12.99t·km^-2 per year,The silicate weathering rate is 2.27t·km^-2 per year,and the rock weathering rate is less than the average of global main river watersheds.The CO_2 consumption by carbonate weathering is 14.66×10^9 mol per year,and that by silicate weathering is 6.40×10^9 mol per year,which both are lower than that of global most river watersheds.

关 键 词：地表风化 水化学 元素地球化学 正演方法 人类活动 风化速率 CO2消耗通量 辽河流域 

分 类 号：P594[天文地球—地球化学]