珠江流域岩石风化作用消耗大气/土壤CO_2量的估算  

Estimation of Atmospheric/Soil CO_2 Consumption by Rock Weathering in the Pearl River Valley

作　　者：覃小群[1,2] 刘朋雨[1,3] 黄奇波[1,2] 张连凯[1,2] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004 [2]国土资源部/广西岩溶动力学重点实验室,广西桂林541004 [3]广西师范学院,广西南宁530001

出　　处：《地球学报》2013年第4期455-462,共8页Acta Geoscientica Sinica

基　　金：中国地质调查局地质调查项目(编号:1212011087121)资助

摘　　要：以流域的岩性、径流量和水化学分析数据为主要资料,利用基于GIS空间分析的GEM-CO2模型,估算珠江流域陆地岩石风化作用消耗大气/土壤空气中的CO2,评价河流流域的碳汇能力。结果表明,珠江流域因岩石溶蚀和风化作用消耗大气/土壤中的CO2量为252×109mol.a-1(571×103mol.km-2.a-1),从岩性分析,碳酸盐岩区大气/土壤CO2消耗量为180×109mol.a-1(1030×103mol.km-2.a-1),占总量的71.4%。二级流域以西江流域CO2消耗量最大,占珠江流域总CO2消耗量79.4%,北江、东江分别占总量的13.0%、4.9%。珠江流域大气/土壤CO2消耗量大约为世界大河流域平均值的2.3倍。The atmospheric/soil CO 2 consumption by rock weathering has become the main carbon sink.The flux of CO 2 consumed by rock weathering increases with the increasing carbonate rock outcrop area and the water drainage intensity.In this paper,with the rock,water runoff and water chemistry data of the valley as the main data,the authors estimated the flux of atmospheric/soil CO 2 consumed by chemical erosion of continental rocks in the Pearl River Valley based on a global erosion model（GEM-CO 2） developed by Amiotte Suchet.The total carbon consumption is about 252×10 9 mol.a-1（571×10 3 mol.km-2.a-1）,about 71.4% of which are caused by carbonate rocks,with about 180×10 9 mol.a-1（1030×10 3 mol km-2.a-1） CO 2 consumed flux.About 79.4% of the consumption of CO 2 is localized in Xijiang tributary basin,because of a high proportion of carbonate rocks and high humidity in this area.In contrast,the Beijiang tributary basin and the Dongjiang tributary basin only possess 13% and 4.9% of the total CO 2 consumption amount respectively.The flux of atmospheric/soil CO 2 consumed in the Pearl River Valley is 2.3 times higher than the average CO 2 consumption of the major river basins in the world.

关 键 词：碳汇 二氧化碳 珠江流域 

分 类 号：P512.1[天文地球—地质学] P595