中文摘要：

文章以岩溶水生生态系统中典型的沉水植物黑藻为研究对象,探讨了在室内条件下封闭体系中黑藻对水中溶解性无机碳（DIC）的利用能力以及其生长情况。实验数据显示,岩溶水中游离CO2、HCO3^-和Ca^2＋含量急剧减少,溶解氧含量增加。结果表明,黑藻不仅能利用水中的游离CO2,而且还可以利用HCO3^-进行光合作用,且岩溶水中的HCO3^-减少了29.27%,Ca^2＋降低了33.34%;与配制的营养液相比,岩溶水中黑藻的分支和假根数量更多,生物量更大,促进了黑藻的生长,岩溶水表现出了一种施肥效应。

英文摘要：

The ability in dissolved inorganic carbon（DIC） utilization and its growth by Hydrilla verticillata grown in closed systems was investigated in the laboratory. Experimental data showed that the free CO2, HCO3^-and Ca^2＋content reduced in karst water, and the dissolved oxygen content increased. Experimental results indicate that Hydrilla verticillata not only uses carbon dioxide, but also can make use of HCO3^-as inorganic carbon source for photosynthesis,about 29.27% of HCO3^-and33.34% of Ca2 ＋in karst water were used by Hydrilla verticillata. Compared with the configuration of the nutrient solution,more Hydrilla＇s branches and rhizoids in karst water, as well as the biomass, promote its growth. The fertilization effect is shown in the karst water.