益阳市土地利用变化与生态系统服务价值响应研究

Study on the response of land use change and ecosystem service value in Yiyang City

随着城市化进程的发展,城市土地利用发生快速变化,这直接造成其生态系统服务价值(ecosystem servicesvalue,ESV)的剧烈改变,而根据城市土地利用变化评估区域ESV可以为城市的可持续发展规划提供科学参考。本研究采用当量因子法,分析了益阳市2000―2020年土地利用变化及其ESV响应,并模拟了多情景下的2030年ESV变化。结果表明:1)在2000―2020年,益阳市土地利用结构保持相对稳定。2)土地利用综合程度指数先减小后增大,建设用地逐年增加,导致整体ESV减少。3)ESV在空间分布上,呈西部高,东部低,且高值围绕资水和沅江的空间分布格局。4)多情景下2030年ESV具有不同的空间趋势,其中,耕地发展情景下,耕地大幅扩张导致林地、水体等用地面积流失,ESV下降最多;生态保护情景下,耕地显著减少,水体明显增多,林地和草地也有增加,ESV比2020年小幅增长,改变了益阳市2000―2020年ESV逐渐下降的趋势。

With the development of urbanization,urban land use has undergone rapid changes,which directly leads to dramatic changes in its ecosystem services value(ESV).The evaluation of regional ESV based on urban land use change can provide a scientific reference for urban sustainable development planning.This study employs the equivalent factor method to analyze the land use changes and ESV responses in Yiyang City from 2000 to 2020,and to simulate the ESV changes in 2030 under multiple scenarios.The results showed that:1)from 2000 to 2020,the land use structure of Yiyang City remained relatively stable.2)The comprehensive index of land use decreased first and then increased,and the construction land increased year by year,resulting in a decrease in the overall ESV.3)In terms of spatial distribution,ESV is high in the west and low in the east,and the high value is around the spatial distribution pattern of Zishui and Yuanjiang.4)Under multiple scenarios,ESV in 2030 shows different spatial trends.Among them,under the scenario of cultivated land development,the substantial expansion of cultivated land leads to the loss of land area such as forest land and water body,and ESV decreases the most.Under the ecological protection scenario,the cultivatedland decreased significantly,the water body increased significantly,the forest land and grassland also increased,and the ESV increased slightly compared with 2020,which changed the gradual decline trend of ESV in Yiyang City from 2000 to 2020.