黄河流域硅酸盐风化的讨论  

Discussion on Silicate Weathering in the Huanghe Drainage Basin

作　　者：张龙军[1] 温志超[1] 

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2009年第5期988-994,共7页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划项目(2002CB412501);国家自然科学基金资助项目(40476063)资助

摘　　要：根据2007年6月和7月采集的黄河干流及部分支流水样和河床砂样品数据,对黄河流域硅酸盐化学风化进行了探讨。在充分评估黄河流域的K+,Na+来源的基础上,确定了硅酸盐风化的K+量,并通过选定的硅酸盐风化(K/Na)比值,得到了硅酸盐风化的Na+量;通过测定流域内不同岩石类型分布的河床砂样品,得到河床砂样品硅酸盐部分(Ca/Na)和(Mg/K)的比值,确定了钙镁硅酸盐风化的Ca2+,Mg2+量;并据此估算了流域硅酸盐化学风化的CO2消耗率。如果选用黄河入海多年径流量58.02×109km3/a进行计算,则得到全流域硅酸盐风化CO2消耗率约为26.22×103mol/km2/a。若选用2007年的平均径流量24.83×109km3/a进行计算,则黄河流域硅酸盐风化引起的CO2消耗率约为11.19×103mol/km2/a。We collected water and riverbed sediments samples from the main stream and some major tributaries of the Huanghe in June and July, 2007 and discussed the chemical weathering processes of silicates. K^＋ and Na^＋ concentrations deriving from silicate weathering were identified, based on the source of K ^＋ and Na^＋ in the Huanghe drainage basin and selected（K/Na） ratios of silicate weathering. Then Ca^2 ＋ and Mg^2＋ concentrations deriving from silicate weathering via the（Ca/Na） and（Mg/K） ratios of silicate from different riverbed sediments in the basin were obtained. Finally CO2 consumption rates by silicate weathering were estimated. When using the average discharge for many years of 58.02 × 10^9 km^3/a and the average discharge of 24.83 × 10^9 km^3/a in 2007, we estimate CO2 consumption rates to be 26.22 × 10^3 mol/km^2/a and 11.19 × 10^3 mol/ km^2/a, respectivelly.

关 键 词：黄河 离子浓度 河床砂 硅酸盐化学风化 CO2消耗率 

分 类 号：X131[环境科学与工程—环境科学]