岩溶地下河流域水循环方式的降水效应  

The precipitation effect on the water cycle mode of karst subterranean stream catchment

作　　者：康志强[1,2,3] 熊志斌[4] 李清艳[2,3,5] 朱琴[2,3,6] 唐伟[2,3,5] 马振杰[2,3,5] 何师意[2,3] 曹建华[2,3] 

机构地区：[1]中国地质大学(武汉)环境学院,武汉430074 [2]中国地质科学院岩溶地质研究所/联合国教科文组织国际岩溶研究中心,广西桂林541004 [3]国土资源部岩溶动力学重点实验室,桂林541004 [4]贵州茂兰国家级自然保护区管理局,贵州荔波558400 [5]西南大学地理科学学院,重庆400715 [6]桂林理工大学环境科学与工程学院,广西桂林541004

出　　处：《地球与环境》2011年第1期26-31,共6页Earth and Environment

基　　金：国家自然科学基金(40672165);中国地调局工作项目"岩溶动力系统及碳循环";"中国岩溶碳汇过程与效应研究"及"我国岩溶碳汇动态评价"

摘　　要：岩溶水中锶元素来源于碳酸盐岩地层的溶解,其浓度受地层岩性及地下水径流条件的控制。通过对贵州荔波板寨地下河流域微量元素锶的水文地球化学特征分析,发现在纯碳酸盐岩流域范围内,岩溶水中锶浓度只受控于地下水径流条件,因而Ca/Sr值能良好的示踪岩溶区地下水循环。在本文中,以Ca/Sr值为判别依据,将板寨地下河流域7个水样点划分为3类,分别为管流带/饱水带水、地下河水及表层岩溶带水。通过对流域水文地质条件分析,地下河流域总排泄量由表层带岩溶水和管流带/饱水带岩溶水两个端元组成。径流切割结果表明,在2009年12月至2010年2月,虽然在地下河径流排泄量中饱水带岩溶水一直占有优势,但表层带岩溶水的贡献比也很可观,均大于40%。但受极端大旱气候的影响,2010年3月末表层岩溶带岩溶水几乎枯竭,其贡献比陡降至7.1%,说明降水对该流域岩溶水循环方式起着控制作用。Strontium in karst water came from carbonate rocks, and its content is controlled by lithology of the formations and the runoff conditions of groundwater. In the area covered by pure carbonate rocks, the strontium content is only controlled by the latter based on the analyzing of strontium hydrochemical character of Banzhai subterranean stream located in Libo County, Guizhou Province. So, the Ca/Sr ratio can be used to discriminate the water circulation mode. In this paper, the 7 water sam- ple sites be divide two 3 types, which are epi-karst water sites, conduit flow zone/saturation zone water sites and subterranean stream debouchure. The total discharge in subteranean stream debouchure is madeup of other two end mumbers. Although the conduit flow zone/saturated zone water is dominated during Dec-2009 to Feb-2010, the contribution of epi-karst water quatity is also very important and more than 40% in total discharge. However, effected by the extremity dry season, the epi-karst water is almost exthaust and its contribution be droped to 7.1% sharply at the end of March 2010. It is shown that the kast water circulation mode is controlled by the precipitation in the study area.

关 键 词：岩溶水循环 锶 板寨地下河流域 

分 类 号：P641[天文地球—地质矿产勘探] P642.25[天文地球—地质学]