Abstract: The assessment of ecosystem service importance is of significance for understanding the spatial distribution pattern of regional ecosystem services and carrying out ecosystem service regionalization. Based on the primary ecosystem services in Hechi of Northwest Guangxi, five basic ecosystem services (biodiversity protection, soil conservation, water resources conservation, rocky desertification control, and products supply) were selected, and an indices system was established by using analytic hierarchy process and multi-factor comprehensive evaluation. With the support of GIS technology, the importance and spatial distribution pattern of the five main ecosystem services were comprehensively assessed. In the study area, the importance of ecosystem services was at a higher level. About 25.2% and 33.4% of the total area had high and medium levels of ecosystem service importance, respectively. In the area, soil conservation and rock desertification control acted as the crucial functions in environmental protection, and the regions with these services were the key regions for ecological protection and restoration. The importance degree and spatial distribution pattern of biodiversity protection, water resources conservation, and products supply were also confirmed. This study could provide reasonable references for ecosystem management and ecological function regionalization in karst areas.

Key words: Bullacta exarata, Rearing shoal, Heterotrophic bacteria, Vibrios