⊙研究背景暑假,我到位于安徽省广德县的太极洞旅游。在参观洞区代表性景观之一壶天宫时,发现洞内钟乳石为黑褐色,十分突兀。询问导游、景区工作人员,他们也觉得很蹊跷,很可惜弄不清具体原因。景区已做了不少工作以清除这些污垢,但效果并不理想。不过,通过交流,我得知了一个事实:壶天宫内钟乳石早前也和其他溶洞内钟乳石一样呈现乳白色,但壶天宫后 ⊙ Research Background Summer vacation, I went to Tai Chi Cave in Guangde County, Anhui Province. While visiting the pot pot palace, one of the representative landscapes in the area, it was found that the stalactites in the cave were dark brown and were very abrupt. Ask tour guides, scenic staff, they also find it very strange, but unfortunately not understand the specific reasons. Scenic area has done a lot of work to remove these dirt, but the effect is not satisfactory. However, through the exchange, I learned the fact that the stalactites in the pot-teapot were also milky white earlier than other karst stalactites, but after the pot-temple