人类活动对川东平行岭谷区岩溶地下水化学性质季节变化的影响

ANTHROPOGENIC EFFECT ON GEOCHEMICAL PROPERTY OF KARST GROUNDWATER IN PARALLELED RIDGE-VALLEY OF EAST SICHUAN

以川东平行岭谷区典型岩溶槽谷——北碚槽上为研究区域,通过对8月和11月的岩溶地下水水化学性质研究,发现槽上岩溶地下水的化学性质呈现明显的季节性:电导率、矿化度、SO42-浓度及HCO3-浓度都是8月大于11月,与气温和降水量的变化相对应,也与人类在8月份对土地利用的强度大于在11月份对土地利用的强度相对应。研究区地下水的化学性质与人类活动对土地利用的季节差异具有比较明显的对应关系,为进一步认识岩溶地下水的时间变化规律提供科学数据,也有利于认识人类活动对生态环境产生的影响,从而采取更加合理的措施来治理和保护岩溶地区有限的地下水资源,满足人们的生活和生产需要。

Groundwater is the unique source of drinking water and irrigative water in Karst region. The geochemistry of ground water varies obviously throughout a year. By analyzing the geochemistry of groundwater in Caoshang Karst valley, the authors found that the geochemical property of groundwater exhibited an obvious seasonal change. Some indexes, including specific conductivity, total dissolved solid, and the concentration of SO4^2- and HCO3^- , were higher in August than those in November. The change was correspondent with the variation of natural conditions because the temperature and precipitation were higher in August than in November in Caoshang Karst valley. Furthermore, the intensity of land use can affect the geochemistry, as anthropogenic activities are normally condensed in August than in November. This paper provides some useful information for understanding the relationship between groundwater and human activity.