| Although the distance between Benzhai cave and Shijiangjun cave in Xixiu district Anshun city, Guizhou province was not
long, there were some huge diffierence about the epi-environment for the two caves, the surface with the crops growth and the cover was good in Benzhai cave, on the contrary the plant in Shijiangjun cave was damaged seriously, belonged to the serious desertification area. The cave drop water was collected from the Benzhai cave and the Shijiangjun cave. At the same time, the Ca2+ density and the δ13CDIC of drop water in these caves were tested. The results showed that the conductivity and Ca2+ density of cave dripping in Benzhai cave was higher than that in Shijiangjun cave which explained that the crops released carbon dioxide through the root respiration to soil, made seepage water dissoluted more CaCO3 and strengthed the Karst dynamic. The δ13CDIC of cave dripping in Benzhai cave was partial negative compared with the Shijiangjun cave which meant that the carbon dioxide strengthed the Karst dynamic mainly came from surface crops. So to recover the vegetation coverage in rocky desertification area had important significance to improve karst area ecological environment. |
