With the progress of urbanization, together with the fragile ecological environment, the ecosystem service functions of Lanzhou City have been weakened, the correct evaluation of the ecosystem service values has the vital significance to the sustainable development of Lanzhou City. Based on the evaluation method developed by Costanza et al. This paper combines the evaluations of the value of the ecological system and the human subjective value, and the exploratory corrections have been conducted based on the willingness to pay and the scarcity of ecosystem services. The service values of the eco-system of the Lanzhou City from 2005 to 2009 are calculated through using the original method and the modified method respectively. The dynamic changes and causes of the values of the ecosystem services are comparatively analyzed based on the said two methods. The results obtained via the Costanza method show that: the total ecosystem service value of Lanzhou City has increased by RMB 24 million in five years, besides the land occupied by the forest, the values of the rest ecosystem services have decreased accordingly. The results based on the modified method show that the total service value of the ecosystem in the past five years has risen RMB 287.3 million, the service values of the woodland, farmland and grassland have also increased, the increase of the forest area has led to the rise of its service value, while the farmland and grassland service values have increased by their scarcity. The farmland, forest land and grassland are of the main types of regional ecosystem services. Research shows that: the rise and fall of the total ecosystem service values can not reflect whether the regional land use is reasonable or not, and the development direction of the ecological system. The increment of the two main types of ecosystem scarcity is the main reason that leads to the rise of the total service value of the ecosystem of Lanzhou City, which reflects the unreasonable land utilization and the degenerative change in the ecological system of Lanzhou City. Attaching great importance to the protection of cultivated land and grassland resources in the city, controlling the expansion of land use in the urbanization process, optimizing the land utilization structure, ensuring the quantity of the reserve land resources and so on are the premises of sustainable development in Lanzhou City.
ecosystem service valuelanduse typesocial development phase coefficientscarcity of ecosystem serviceLanzhou City
国家科技期刊平台
NSTL
万方数据
维普
