南昌市土地利用及生态服务价值变化研究

以南昌市为例,借助RS和GIS技术,对南昌市2000年、2005年、2010年、2015年的4期遥感影像进行处理,利用土地利用动态度和土地利用转移矩阵,分析2000-2015年南昌市土地利用变化;计算南昌市生态服务价值、生态服务价值转移矩阵、敏感性系数,探讨南昌市2000-2015年生态服务价值及其时空变化特征。结果表明:2000-2015年南昌市耕地明显减少,建设用地显著增加,综合土地利用动态度为1.24%;南昌市生态服务价值变化不大,其总量由2000年的390.35×108元增加到2015年的393.30×108元;2000-2015年高生态服务价值区主要分布在新建县东部和进贤县北部,低生态服务价值区主要分布在南昌市城区;各土地利用类型生态服务价值敏感性指数均小于1,说明研究结果可信。土地利用变化是引起生态服务价值变化的直接原因,科学合理地利用土地对维持和提升区域生态服务价值具有重要意义。

Changes on Land Use and Ecological Service Value in Nanchang City

Based upon changes on the ecological service value (ESV) due to varied land uses in a municipality,structure and sustainable development of the regional ecosystem can be visualized and appropriate planning materialized.This article describes the land use dynamics,transfer matrix,and changes in Nanchang city from 2000 to 2015 using the remote sensing images of the city in 2000,2005,2010 and 2015 with an analysis by RS and GIS technology.Applying the calculated ESV,transfer matrix and sensitivity coefficients,the city's temporal and spatial variations caused by the changed land use became available for the study.In Nanchang over the years between 2000 and 2015,the cultivated land decreased significantly while the land taken over by varieties of construction increased markedly.The degree of dynamic land changes was 1.24％.Meanwhile,the total value and structure of municipal ecological services scarcely changed,while the ESV increased merely from 390.35 × 108 yuan in 2000 to 393.30 × 108 yuan in 2015.At the time,the areas with high ESV concentrated mostly in the eastern part of Xinjian County and north of Jinxian County,whereas the low ESV fell mainly in downtown and the areas within the city limit.The sensitivity indices of all ESV classes were less than 1 indicating a reliability of the results.ESV changes were directly caused by the changing land use.Hence,scientifically directed and managed land use would be of great significance to a well maintained and serviced regional ecosystem.