Land Utilization Variation and Response of Its Ecological Service Value in Less Developed Area:Taking Example for Ankang City of Shaanxi Province

Based on the detailed survey data of the land utilization status in Ankang city in the year 2002 and 2008,the article used the dynamic degrees of both single-item land utilization and comprehensive land utilization to analyze the changing trend of land use in Ankang.Referring to the equivalent table of Chinese terrestrial ecosystem service value per unit,the ecosystems service values of this city in the year 2002 and 2008 were estimated by using Costanza's formulae.The results showed that: from 2002 to 2008,the areas of the cultivated land and grassland in Ankang reduced significantly,while the areas of woodland,garden land,building land,wetland and water-area were gradually increased,and the transformation of land utilization occurred mainly between the cultivated land,grassland and woodland,garden land.The ecosystem service value of Ankang city increased by 77.39 hundred million yuan,which was caused mainly by the large-area transformation of the cultivated land and grassland into woodland and garden land.Meanwhile,the various single ecosystem service function value showed an increasing tendency except for food production and waste disposal.In the structure of ecosystem service value,the contribution rate of woodland surpassed 80%,and this feature was further consolidated in the period of this study.