结题英文摘要 Aimed to the typical epikarst ecosystems, and by the means of automatic monitoring techniques, field surveying and experiments, this project has made some studies on following aspects: the processes of the transfer and reposition of matters such as carbon, water and calcium in karst systems; probed into the differences of adjusting functions of karst ecosystems under the different conditions of surface covers; made more understandings to the "double layers" of epikarst systems. At the some time, the scientific data acquired during the project research is helpful to the curing of outstanding environmental problems and to the reasonable development of resources in karst areas, South China. The achievement of this project can be briefly summed up as following: (1)the carbon contributing to karst processes mainly comes from ecological system itself under the condition of existence of vegetation and soil covers; (2)results indicates that the depositing processes of rainfall to CO2 is an important "sink" to global carbon cycle; (3)owing to the differences of vegetation and surface covering, the adjusting effect of ecosystem to environmental humidity, temperature and CO2 concentration near surface air which indicates different benefit of preventing water and soil from lose is marked; (4)the preponderant species of vegetation in the karst ecosystems which have different kinds of carbonate rocks are obviously variant, and this situation results to the clearly differences of the micro－habitat，structure of surface cover and water holding capacity; (5) the relevant study showed that the carpophagous animals and birds make a important role in the spreading of vegetation seeds. The designed experience for the study of seed reservoir was not able to obtain a satisfactory result. The online monitoring is important technical means in this project research, by the way, we obtained the corresponding dynamic processes among main hydrochemical and hydrological indexes of karst water springs, and meteorologic parameters. The understanding above will deepen the relevant research, accumulate scientific data and explore research methods.