我们在贵州省盘县境内已通车的平关铁路隧道进行岩溶地下水连通试验时(1978年6月至9月16日),采用了 NO’_2、石松孢子、萤光素及谷糠等示踪物,作了6个点11次投放,四个点接收,其中二个点接收到三次,另有一点尚难确定。试验结果详见表1。 When we conducted the karst groundwater connectivity test at Pingguan Railway Tunnel, which had been opened to traffic in Panxian County, Guizhou Province (June 1978 to September 16), we used traces of NO’_2, spores, luciferin, and gluten. The object was made 11 points at 6 points and received at four points. Two of the points received three times. Another point is still difficult to determine. The test results are detailed in Table 1.