中文摘要：

碳酸酐酶（carboni canhydrase，CA）是一种厂泛存在的金属酶，催化CO2的水合反应。硅藻分泌的碳酸酐酶能促进石灰岩的溶蚀。对硅藻碳酸酐酶在石灰岩岩溶中的作用进行了探讨。结果表明，硅藻碳酸酐酶在生物岩溶中具有重要的作用和地位，同时为深入研究生物对石灰岩的溶蚀作用提供了一定的科学依据。

英文摘要：

Carbonic anhydrase is a kind of widely existent metallic enzyme, which can catalyze the hydration of CO2.The carbonic anhydrase secreted by diatom can promote the corrosion of karst. According to the functionary mechanism of diatom＇s carbonic anhydrase, the functions of carbonic anhydrase of diatom in Karst are studied. It shows that the carbonic anhydrase of diatom plays an important role in biological karst, and meanwhile provides scientific foundation for researching the biological function to corrosion of karst in depth.