2007-2015年东莞市土地利用及其生态系统服务价值的时空演变

Spatial-temporal Changes in Ecosystem Service Values Based on Land Use Changes in Dongguan City During 2007-2015

[目的]研究2007-2015年东莞市的土地利用和生态系统服务价值的时空变化情况,以反映土地利用变化产生的生态效应,为区域土地资源可持续利用和生态环境保护决策提供参考.[方法]运用土地利用及生态系统服务价值相关理论与方法,利用遥感、地理信息技术,分析土地利用与生态系统服务价值的时空变化情况.[结果]①2007-2015年间,东莞市建设用地占研究区总面积50%以上,且持续增加,增加的面积以耕地、林地的转入为主,水域和林地面积先增加后减少,耕地和草地面积不断缩小.②研究期内,生态系统服务价值整体呈现下降趋势,总价值减少1.97×108元,林地、水域的生态系统服务价值系数较大,价值的损益变化大,2015年,林地和水域价值共减少1.40×108元.③从空间分布看,东莞市的生态系统服务价值以中部地区为中心,向东西延伸,形成了“高—低—高”的空间分布格局,主城区是整个东莞市生态系统服务价值的低值中心.[结论]研究时段内,东莞市土地利用变化显著,生态系统服务价值整体下降,生态系统服务价值在空间上呈现出异质性,分布不均衡.

[Objective]The spatial and temporal changes in land use and ecosystem service value from 2007 to 2015 in Dongguan City,Guangdong Province,were analyzed.The aim was to determine the ecological effects of land use change and to provide a decision-making reference for sustainable use of regional land resources and ecological environmental protection.[Methods]The spatial and temporal changes in land use and ecosystem service value were analyzed using the theories and methods of land use and ecosystem service value,remote sensing,and geographic information technology.[Results]①From 2007 to 2015,construction land in Dongguan City accounted for more than 50%of the total area of the study area,and increased continuously.The increased construction land mainly replaced cultivated land and forest land.The area with water and forest land first increased and then decreased,and the area of cultivated land and grassland decreased continuously.②During the study period,the value of ecosystem services showed a downward trend.The total value of ecosystem services decreased by 1.97×108 yuan.The value coefficient of ecosystem services was the highest for forest land and the water area,and the profit and loss of ecosystem services fluctuated considerably.The value of forest land and water area decreased by 1.40×108 yuan in 2015.③From a spatial distribution perspective,the ecosystem service value of Dongguan City was centered in the central region and extended to the east and the west,forming a“high-low-high”spatial distribution pattern.The main urban area corresponded to the low-value center of the ecosystem service values of Dongguan City.[Conclusion]The land use of Dongguan City changed significantly from 2007 to 2015:the total ecosystem service value decreased,and the ecosystem service value presented heterogeneity and uneven spatial distribution.