表层岩溶带岩溶泉的水化学动态变化及其环境效应--以马山弄拉兰电堂为例

利用多参数自动记录仪对马山弄拉兰电堂泉的降水量、水位、水温、pH值、电导率和Ca^2 含量进行了自动监测,结果发现；泉水在夏季降雨期间pH值呈降低趋势，同时电导率和Ca^2 含量也降低，该现象的发生主要是由雨水的稀释作用造成的；在冬季这种干旱环境中的水化学变化规律主要是泉水在白天温度升高时出现电导率升高，pH降低．同时通过对K^ ，Ca^2 等离子的监测可以了解石山地区植被的生长并不是由于土壤中必需元素背景值低而受到限制，而是由于表层岩溶带具有较高的裂隙和渗透率造成大量有益元素的流失影响作物的生长．因此，通过此次研究不但可以进一步了解表层岩溶泉的水化学动态变化规律及其产生的环境效应，而且还能为石山地区在生态治理以及水土保持上提供一定的理论依据．

HYDROCHEMICAL VARIATIONS OF THE EPIKARST ZONE AND ITS ENVIRONMENTAL EFFECT--AN EXAMPLE SPRING OF LANDIANTANG AT NONGLA,MASHAN

High resolution measurements of stage,pH,conductivity,temperature and rainfall of Landiantang Epikarst spring at Nongla,Mashan in Guangxi Province,China were monitored by using data logger recording with fifteen minutes resolution.During the rainfall,it was found the conductivity also falls when the pH of Landiantang spring drops.But,in winter when rainfall is small,hydrochemical variations of the spring was controlled by water/rock/gas interactions and organic acid produced by biology.So,at daytime the pH of spring falls while conductivity rises.Moreover,by studying the character of epikarst,it was found that the elements of water-solubility will eluviate and make soil lean,which accelerates rocky desertification and cause serious environmental peoblems.