嘉陵江流域土地利用变化的生态系统服务价值评估

Assessment of Ecosystem Service Value of Land Use Change in the Jialingjiang Watershed

根据嘉陵江流域2000、2005和2015年3期土地利用遥感影像数据,将地理数学方法与GIS相结合,研究了嘉陵江流域15年各种土地利用类型的面积变化、土地利用动态度等动态变化信息,并估算了各种土地利用类型的生态系统服务价值。结果表明,2000—2015年,嘉陵江流域耕地面积持续减少,而建设用地、草地、水域、林地和未利用地面积增加;嘉陵江流域生态系统服务价值由2000年的243 109.36百万元减少到2015年的242 805.95百万元;嘉陵江流域生态系统服务价值对价值系数缺乏弹性,反映耕地面积的变化对研究区生态系统服务价值的变化具有较大影响。

According to the TM images of Jialing River watershed in the years 2000,2005 and 2015,by using Geo-mathematical method and GIS method,the author analyzed the changes of land use area and the dynamic indexes of land use,and estimated the ecosystem service value of land use change in Jialing River watershed in 15 years.The results showed that from 2000 to 2015,the areas of cultivated land decreased continuously,and the areas of construction,grassland,water,forestland and unused land of Jialing River watershed increased.The ecosystem service value of Jialing River watershed decreased from 243 109.36 million yuan in 2000 to 242 805.95 million yuan in 2015.The sensitivity analysis showed that the ecosystem service value in study area was inelastic,the cultivated land area change reflected by the value change between land use and the ecosystem service value had a great influence.