Özet:

River Basin areas are areas that provide ecosystem services. These areas are decreasing due to natural and anthropogenic activities. With the increase of climate change, anthropological effects and urbanization, environmental problems have increased in the basins. One of the approaches used from global to local scale to analyze and report environmental problems is the DPSIR (Drivers, Pressures, Conditions, Impacts and Responses) model. 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 sub-basins of the Yeşilırmak basin, which has a high rate of deterioration due to socio-economic, anthropogenic and nature-related factors. The aim of the study is to detect the changes in ecosystem services in the Tersakan sub-basin with the DPSIR model and to develop suggestions for the application of 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, fresh water, 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.

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