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通过对重庆芙蓉洞上覆泉水、洞穴滴水的氢氧稳定同位素和气象要素的系统监测,发现芙蓉洞滴水主要来源于当地大气降水,洞穴滴水稳定同位素变幅远小于上覆泉水。其中滴水与泉水的δ18O变幅分别在-7.7‰～-6.8‰和-12.4‰～-4.7‰之间。洞穴滴水和岩溶泉水之间并未出现协调的季节变化规律。另外重庆地区10月份降水状况对上覆泉水稳定同位素影响明显。分析表明洞穴系统上覆基岩的厚度和包气带含水层的调蓄作用对洞穴滴水的同位素不变化影响巨大,平滑了其中的月季变化信息,在利用洞穴沉积物重建高精度古气候信息要对其格外注意。
Through the systematic monitoring of the hydrogen and oxygen stable isotopes and meteorological elements of Furong Cave overlying springs and caves in Chongqing, it is found that the drip of Furong Cave mainly comes from the local atmospheric precipitation, and the stable isotope variation of cave drip water is much smaller than that of overlying spring water. The δ18O amplitude of drip and spring water was between -7.7 ‰ ~ -6.8 ‰ and -12.4 ‰ ~ -4.7 ‰, respectively. There is no coordinated seasonal variation between cave drip and karst spring. In addition, the precipitation in Chongqing in October affected the overlying spring water stable isotope obviously. The analysis shows that the thickness of overlying bedrock in the cave system and the regulation and storage of the aquifer in the aeration zone exert a great influence on the isotopic change of the drip of the cave, smoothing the information of the change in them, and reconstructing the information of the paleoclimate at a high level with the cave sediment Pay special attention to it.