摘要:江西省的赣南地区是典型的南方山地丘陵区，属于赣江流域重要的生态屏障区，生态保护的意义重大。以赣南为研究区域，基于1990-2015年间的6期遥感影像，利用遥感、地理信息技术和空间统计的方法，计算了该区域土地利用动态度，对不同生态用地所提供的生态系统服务价值进行评估，分析了生态系统服务价值时空差异的驱动因素，并将人均GDP、人口密度和城市化率3个因素与生态系统服务价值进行空间相关性分析。结果表明：（1）1990-2015年间，赣南地区综合土地利用动态度持续上升，各用地类型的综合土地利用动态度从0.06上升到0.13。（2）1990-2015年间赣南地区共减少生态系统服务价值20.42×10⁸元，处于下降趋势，其中森林的生态系统服务价值损失最大。研究区调节服务价值最高，其供给服务较低，该地区森林覆盖率高，耕地分散是造成该结果的主要原因。（3）人均GDP、人口密度和城市化率3个因素是生态系统服务价值变化的主要驱动因素且与生态系统服务价值的局部空间相关性高度一致。城市化率越高，生态系统服务价值越低，并形成局部低-高型和高-高型集聚分布。本研究为合理布局和保护我国南方丘陵地区的生态用地，发挥赣南地区的生态屏障作用提供了理论依据和决策支持。



Abstract:Gannan region, an important ecological barrier in the Gan Jiang River basin, is a typical southern mountain-hill area in Jiangxi Province, China, and its ecological protection is of great significance. In this study, using data of 5-year intervals from 1990 to 2015, the land-use change dynamics and ecosystem service value in the Gannan region was investigated through the application of remote sensing, geographic information technology, and spatial statistical methods. In addition, the driving factors of spatial and temporal differences in ecosystem service value for the Gannan region and the spatial correlation between three factors-per capita GDP, population density and urbanization rate, and ecosystem service value-were also investigated. The results showed that (1) the dynamic degree of land use in the Gannan region increased over the 25 years of investigation from 0.06 to 0.13; (2) the ecosystem services assessment showed that the total value of the ecosystem services in the Gannan region declined by 20.42×10⁸ yuan over the study period. The ecosystem services provided by the forest ecosystem led to the highest loss in value. High forest cover and scattered arable land are the main reasons for the high regulation service value and the low supply service value in the Gannan region; (3) the per capita GDP and the population density and urbanization rate were the main driving forces that led to decrease regional total ecosystem service value. They were also highly consistent with the local spatial correlation for ecosystem service value. The higher urbanization rate led to the lower ecosystem service value, and had local low-high and high-high aggregation distributions. This study provides a theoretical basis and a decision support mechanism for the rational layout and protection of ecological land in this southern hilly region. The results could lead to improved ecological barrier functions.





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