喀斯特石漠化小流域土壤渗滤水化学特征及影响因素研究  

Chemical Characteristics of Soil Percolating Water and Influencing Factors in Karst Stony Desertification Area

作　　者：陈生华[1,2,3] 王世杰[1,2] 杨涛[1,2,3] 肖德安[1,3,4] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002 [2]中国科学院普定喀斯特生态与石漠化试验研究站,贵州普定562100 [3]中国科学院研究生院,北京100049 [4]贵州省环境监测中心站,贵州贵阳550002

出　　处：《水土保持通报》2011年第6期26-31,共6页Bulletin of Soil and Water Conservation

基　　金：中国科学院知识创新工程重要方向项目"岩溶山地土壤与植被关联退化过程及其调控对策研究"(KZCX2-YW-306);国家重点基础研究(973)发展计划项目(2006CB403200)

摘　　要：对贵州省清镇王家寨喀斯特小流域9个样地的土壤渗滤水进行了系统监测。结果表明,随着石漠化退化程度的加剧,黑色石灰土地区土壤渗滤水中的HCO3-,Ca2+,方解石饱和指数(SIC)和黄壤地区土壤渗滤水中的Mg2+离子浓度均呈升高趋势。初步认为,植被和土壤的双重退化是控制石漠化发育过程中渗滤水化学组成的主要原因,当植被系统的退化先于土壤系统时,水—土反应强度的影响更大,渗滤水化学组成表现为HCO3-和Ca2+含量随石漠化的发育而减少;当土壤系统的退化先于植被系统时,水—土反应时间的影响更大,渗滤水的化学组成则表现为HCO3-和Ca2+含量随石漠化的发育而增加。A systematically monitoring has been carried of soil percolating water in karst stony desertification area.The result showed that higher the degree of stony desertification is,the higher the concentrations of HCO-3,Ca2＋ and the value of calcite saturation index（SIC） in the percolating water from rendzina area are.The concentrations of Mg2＋ in water samples from yellow soil area showed the same trend.It maybe result from related soil and vegetation degradation.When vegetation degradation starts earlier than soil,the concentrations of HCO-3,Ca2＋ will decrease with the development of stony desertification due to the stronger reactions between water and soil.On the contrary,when soil degradation starts earlier than vegetation,the concentrations of HCO-3,Ca2＋ will increase with the development of stony desertification due to more time requirement for reactions between water and soil.

关 键 词：喀斯特石漠化 土壤渗滤水 喀斯特小流域 水化学特征 

分 类 号：P642.25[天文地球—工程地质学]