Spatial-temporal response of ecological service value to land use change: A case study of Xuzhou City
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摘要: 徐州市是淮海经济区的中心城市, 生态环境保护工作任重而道远。通过2005—2015年间徐州市的遥感影像数据制作徐州市土地利用变化图,再结合相关统计年鉴数据,利用GIS空间统计的方法, 计算出研究期间徐州市的土地利用动态度和土地利用转移矩阵。在此基础上以当量因子法的研究为基础,以研究区域的具体情况确定相关修正系数,定量研究了徐州市的生态系统服务价值在时间及空间上的变化。从土地利用变化和生态系统服务价值变化之间,研究其变化关系。研究结果表明: ①徐州市主要用地类型以耕地为主, 2005—2015年间, 耕地、林地、水域和草地面积减少, 未利用地小幅度增加,建设用地增加面积较大,同时不同土地利用类型之间转化剧烈,耕地大面积向林地、草地和建设用地转出,增加的建设用地面积主要是由耕地转化而来; ②在二级生态系统服务类型中,水文调节和废物处理服务价值最高,原料生产服务价值较低,研究期各单项生态系统服务价值均呈现出不断下降的趋势,进而导致徐州市总生态系统服务价值不断减少,10 a间共减少了2.9×109元,在一级生态系统服务类型中,耕地生态系统服务价值减少了1×109元,林地生态系统服务价值减少了1.43×109元,二者生态服务价值减少量占总生态服务价值减少量的80%以上; ③不同时期各地类的生态系统敏感性指数均小于1,说明研究期间徐州市各地类生态价值系数和生态系统服务价值是一种缺乏弹性的关系,因此采用生态价值系数的计算方法是合理可靠的,计算结果具有可信度。Abstract: As a central city in the Huaihai Economic Zone, Xuzhou has a long way to go in terms of environmental protection. A map of land use change during 2005—2015 in Xuzhou was prepared according to the remote sensing images of this period. Based on this as well as relevant statistic yearbooks, the land use dynamic degree and land use transfer matrix of Xuzhou during 2005—2015 were calculated using the method of GIS spatial statistics. Then relevant correction coefficients were determined according to the specific conditions of the study area using the equivalent factor method, and the spatial-temporal changes in the ecosystem service values in Xuzhou were quantitatively analyzed. Meanwhile, the relationship between the land use change and ecosystem service value change was investigated. The results are as follows. ① The land use types in Xuzhou are dominated by cultivated land. During 2005—2015, the area of the cultivated land, forest land, water areas, and grassland decreased, the unused land slightly increased, and the construction land considerably increased. Meanwhile, different land use types were drastically converted. In detail, a large area of cultivated land was converted into forest land, grassland, and construction land, and the increased area of the construction land was mainly converted from the cultivated land. ② Among the second-order ecosystem services, the hydrological regulation and waste treatment services possessed the highest values, while the raw material production service showed a low value. During the study period, the value of each individual ecosystem service showed a downward trend, which led to a continuous decrease in the overall ecosystem service value of Xuzhou City. Specifically, the values of the second-order ecosystem services decreased by 2.9×109 yuan in total in the ten years. For the first-order ecosystem service types, the values of cultivated land and forest land ecosystem services decreased by 1×109 yuan and 1.43×109 yuan, respectively, the sum of which accounted for more than 80% of the total reduced value of first-order ecosystem services. ③ The sensitivity index values of the ecosystem services to various land use types were all less than 1 in different stages, indicating an inelastic relationship between the ecosystem value coefficients and the ecosystem service values of various land use types during the study period. Therefore, the ecological value coefficients and calculation method used in this paper are reasonable and reliable, and thus the calculation results are credible.
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Key words:
- land use change /
- ecosystem service value /
- land use transfer matrix /
- Xuzhou City /
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