DPSIR Çerçevesi ile Ekosistem Hizmetlerinin Değerlendirilmesi.

River Basin areas provide ecosystem services. These areas are decreasing due to natural and anthropogenic activities. With the effects of climate change, anthropological effects and urbanization, environmental issues are continuously increasing in the basins. One of the approaches to analyze and report environmental problems is the DPSIR (Drivers, Pressures, States, Impacts and Responses) model used as a a global to local scale. Using the DPSIR model to analyze anthropogenic factors and environmental pressures helps to analyze, identify and evaluate complex environmental problems. This study was carried out in the Tersakan sub-basin, which is one of the biggest sub-basins of the Yeşilırmak basin, which has a high rate of deterioration due to socio-economic, anthropogenic, and nature-related factors. The study aims to detect the changes in ecosystem services in the Tersakan sub-basin with the DPSIR model and to develop suggestions for the application of applying the model. As a result of the study, it has been found that the degradation in the sub-basin is more in providing(Food, water, freshwater, biological material, decorative resources, genetic resources, biochemicals and medicinal products) ecosystem services and cultural (cultural diversity, moral and ethical values, information system, educational value, inspirational value, aesthetic values, social relations, sense of place and space, cultural heritage value, recreation and ecotourism) ecosystem services. [ABSTRACT FROM AUTHOR]