石漠化地区降雨条件下洞穴滴水时空变化特征——以贵州石将军洞为例

Temporal and Spatial Variation Response of Cave Drip Water under Rainfall Condition in Rocky Desertification Area——A Case Study of Shijiangjun Cave,Guizhou

降雨条件下,对贵州中度石漠化地区石将军洞的3个滴水点与洞穴环境进行了短时间尺度监测,探讨其时空变化特征及石漠化效应,结果表明:洞内温度与CO_2体积分数变化趋势受洞外环境变化控制,且滞后性较小.1#监测点上覆土壤较厚,基岩中白云岩的质量分数较高,溶液渗流时间较长,降雨响应慢,连通性较差;2#监测点上覆土壤较薄,基岩中石灰岩的质量分数较高,降雨响应快,连通性好;3#监测点上覆土壤层薄,基岩中石灰岩的质量分数较高且岩层厚度大,降雨响应慢,连通性较好.

A short-term scale monitoring of three drip points in Shijiangjun cave and its cave environment was conducted under rainfall condition in moderate rocky desertification area of Guizhou, in order to explore its temporal-spatial variation characteristics and rocky desertification effect. The result shows that： the change trends of cave temperature and CO2 concentration, which have small hysteresis, are controlled by the environment outside cave. 1 # has thicker overlying soil and high quality fraction of dolomite in bedrock, long solution seepage time, slow rainfall response and poor connectivity; 2 # has thinner overlying soil and high quality fraction of limestone in bedrock, fast rainfall response and well connectivity; 3 # has thin overlying soil and high quality fraction of limestone in bedrock with large thickness, slow rainfall response and well connectivity.