1990—2020年寻乌县土地利用及生态系统服务价值变化

Changes of land use and ecosystem services value in Xunwu County from 1990 to 2020

探究长时间序列下江西省赣州市寻乌县土地利用变化特征及其对生态系统服务价值(ESV)的影响,对保障东江流域生态安全和改善区域生态环境具有重要意义。利用1990—2020年土地覆被数据,分析该时间段寻乌县土地利用的变化情况,并利用当量因子法评估寻乌县生态系统服务价值。结果表明,寻乌县主要土地利用类型为林地,其次为耕地,2种土地利用类型占寻乌县总面积的比例超98.0%。1990—2020年寻乌县林地和草地的面积总和总体呈下降趋势,耕地面积占比逐年增加,退耕还林还草面积小于耕地开垦面积。1990—2020年寻乌县生态系统服务价值总体呈下降趋势,ESV低值区主要分布在研究区的西南部、中部,ESV高值区则与研究区林地的分布较为一致。

It was of great significance to explore the characteristics of land use change in Xunwu County,Ganzhou City,Hubei Province,and its impact on ecosystem services value(ESV)in the long-term series to ensure the ecological security and improve the regional ecological environment in the Dongjiang Basin.Based on the land cover data from 1990 to 2020,the change of land use in Xunwu County during this period was analyzed,and the ecosystem service value of Xunwu County was evaluated by using the equivalent factor method.The results showed that the main land use types in Xunwu County were forest land,followed by cultivated land,and the proportion of the two land use types in the total area of Xunwu County was more than 98.0%.From 1990 to 2020,the total area of forest land and grassland in Xunwu County showed a downward trend,the proportion of cultivated land increased year by year,and the area of farmland returned to forest and grassland was less than the area of cultivated land reclamation.From 1990 to 2020,the ecosystem service value of Xunwu County showed a downward trend,and the areas with low ESV values were mainly distributed in the southwest and central parts of the study area,while the areas with high ESV values were consistent with the distribution of forest land in the study area.