基于InVEST模型的杨溪河流域土地利用变化对水源涵养功能的影响

水资源短缺问题已经严重制约人类的生产生活，研究不同土地利用条件下的产水量和水源涵养功能，可科学指导区域水资源的利用和管理。利用生态系统服务和权衡的综合评估模型(integrated valuation of ecosystem services and tradeoffs, InVEST)模型分析了杨溪河流域1995年、2005年和2015年不同土地利用情况下的水源涵养量和水源涵养服务价值。结果表明：杨溪河流域在1995年的水源涵养量大于2005年和2015年，2005年和2015年的水源涵养量较为接近；杨溪河流域1995年、2005年和2015年的产水量均显示出上游和下游有较高的产水量；杨溪河流域在1995年、2005年和2015年的水源涵养服务价值分别为23.56亿元/a、21.44亿元/a和21.55亿元/a。人类活动将影响杨溪河流域水源涵养功能，在水资源开发利用方面，要协调好经济、环境和资源等各方的关系，为杨溪河流域等中国南方地区中小流域的开发利用和保护提供参考依据。

Influence of Land Use Change on Water Conservation Function in Yangxi River Basin based on InVEST Model

The shortage of water resources has severely restricted the production and life of human beings. The study of water yield and water conservation function under different land use conditions could scientifically guide the utilization and management of regional water resources. The InVEST model was used to evaluate the water conservation capacity and water conservation service value of the Yangxi River Basin under different land use conditions in 1995, 2005 and 2015. The results showed that the water conservation quantity of Yangxi River Basin in 1995 was greater than that in 2005 and 2015, and the water conservation quantities in 2005 and 2015 were relatively close. The annual water yield of Yangxi River Basin was higher in upstream and downstream areas in 1995, 2005 and 2015. The water conservation service values in Yangxi River Basin in 1995, 2005 and 2015 were 2.356 billion yuan/a, 2.144 billion yuan/a and 2.155 billion yuan/a, respectively. Human activities would affect the water conservation function of Yangxi River Basin. It is necessary to coordinate the relationship among economy, environment and resources,so as to provide reference for the development, utilization and protection of Yangxi River Basin and other small and medium-sized river basins in South China.