吐鲁番市土地利用转型及生态服务功能交叉敏感性

Cross-sensitivity analysis of land-use transformation and ecosystem service functions in Turpan City,China

厘清吐鲁番市2000-2018年土地利用转型及生态服务价值时空演变特征,探讨生态服务价值与地类转型的相互关系,可为合理规划区域土地资源的同时实现生态服务功能的改善和提升提供依据。基于5期土地利用遥感影像数据,采用土地利用动态变化模型及修正后的生态服务价值系数,结合改进的交叉敏感性系数模型分析生态服务价值对土地利用转型的敏感程度。结果表明,1)吐鲁番市以草地、未利用地及耕地等地类为主,建设用地、耕地持续扩张,水域、草地不断减少,其中以草地与水域、耕地及未利用地之间的转型为主;2)研究时段内生态系统服务价值呈现“先减后增再减”的动态变化趋势,高值区主要分布于北部山区以及中部绿洲平原区域;3)生态服务功能对林地、水域、草地及未利用地向其他地类转型敏感性响应程度较高,草地、建设用地与未利用地转型的高敏感区分布较广,未利用地与水域、建设用地间转型的低敏感区分布较广。区域应加强对水域、林地、草地等生态系统的保护,在发展经济建设的同时注重合理规划土地资源及生态环境质量的提升。

Exploring the interrelationship between ecosystem service values and land class transformation in Turpan City,China during 2000-2018,it would provide a reference basis for how to reasonably plan regional land resources and realize the improvement and promotion of ecosystem service functions.In this study,a dynamic change model of land use and the revised ecosystem service value coefficient,combined with the improved cross-sensitivity coefficient model,were used to analyze the degree of sensitivity of ecosystem service values based on five periods of land-use remote-sensing imaging data.The results were as follows:1)The area comprises mainly grassland,unused land,and cultivated land.Construction and cultivated lands continued to expand,whereas water bodies and grasslands are decreasing.Among these land types,the transformations among grassland,water bodies,cultivated land,and unused land are the main focus;2)During the research period,the ecosystem service values showed a dynamic change trend of decreasing first,then increasing,and then decreasing.High-value areas are mainly distributed in the northern mountains and the central oasis plain;3)Ecosystem service functions are highly sensitive and responsive to the transformations of woodland,water bodies,grassland,and unused land into other land types.The highly sensitive areas of transformation among grassland,construction land,and unused land are widely distributed,as are the low-sensitivity areas of transformation among unused land,water bodies,and construction land.Regions should strengthen the protection of water bodies,woodlands,grasslands,and other ecosystems and pay attention to the rational planning of land resources and the improvement of ecological environment quality while developing economic construction.