基于InVEST模型的未来土地利用变化对水源涵养功能的影响——以杨溪河流域为例

Effect of Future Land Use Change on Water Conservation Function Based on InVEST Model--Taking Yangxi River Basin as an Example

以杨溪河流域为例,利用未来土地利用变化情景模拟(GeoSOS-FLUS)模型对未来土地利用情况进行模拟,并通过InVEST模型对水源涵养功能进行分析。结果表明:整体上杨溪河流域内未来各类土地利用类型更趋于集中,耕地面积大量减少并趋于消失,林地面积大量增加并普遍大于其他土地类型;杨溪河流域在现状和未来各情景下均表现为上游和下游的产水量较高;人类活动会对杨溪河流域产水量产生影响,注重全球化的变化和环境保护可保持流域良好的水源涵养功能。水源涵养功能在流域的开发利用中有重要作用,需要保护林地并协调经济、环境和资源等各方面之间的关系,以维持杨溪河流域等我国南方中小流域较强的水源涵养功能。

Taking Yangxi River Basin as an example,this paper used GeoSOS-FLUS model for simulating land use change in the future,and used InVEST model to analyse the water conservation function.The results showed that:As a whole,the land use types in Yangxi River Basin would be more concentrated in the future,and the area of farmland would be greatly reduced and tend to disappear.The area of forest land would increase greatly and would be generally larger than other types of land.Yangxi River Basin had higher water yield in the upstream and downstream areas in current and all future scenarios.Human activities would affect the water yield of Yangxi River Basin.Paying attention to the change of globalization and environmental protection could maintain a good water conservation function of the basin.Water conservation function would play an important role in the development and utilization of the basin.It is necessary to protect forest land and coordinate the relationship among economy,environment and resources to maintain the strong water conservation function of Yangxi River Basin and other small and medium-sized river basins in the south of China.