[Evaluation of ecosystem services of the Thousand-Island Lake, Zhejiang, China.].

We quantitatively evaluated Thousand-Island Lake's aquatic ecosystem service value and analyzed its developing trend at the whole lake scale. We built an index system to evaluate the ecosystem service of Thousand-Island Lake, which included 16 indicators of 10 categories. The results showed that the total value of ecosystem services of Thousand-Island Lake was 49.3 billion and 57.2 billion yuan in 2007 and 2017, respectively. The highest value of Thousand-Island Lake's ecosystem service was its regulating function, which played an absolutely dominant role. Ranked according to their values, different functions of the final ecosystem services were in a descending order of floodwater regulation, surface water regulation, carbon sequestration (reduction), oxygen generation, tourism, water purification, fishing, energy saving through water source heat pump, water for hydropower, agriculture, forestry and animal husbandry uses of water resources, ecological and public use of water resources, water source for industrial use, volume of freight transportation, water source for city resident use, water circulation cooling, and passenger transportation. Thousand-Island Lake provided a total ecosystem services value of 86.0 million and 99.8 million yuan·km, which was 47.6 and 17.3 times as the GDP per area in Chun'an County in 2007 and 2017.