| China is a country with a possession of many lakes, and civil welfare is highly related to the lake ecosystem services. The evaluation of ecosystem services functions is the foundation of achieving sustainable development, usage and management of lakes watershed. However, the quantification evaluation of the ecosystem services functions relies on single and static evaluation methods for now. The In Vest model which is developed via GIS is capable to meet the integrated, dynamic, visible evaluation of ecosystem services. In this work, according to the research progress of ecosystem services function and ecological service functional assessment based on In Vest model, we summarized the different classification system, such as classic, In Vest-based functional assessment and lakes ecosystem services function. Moreover, we constructed an In Vest-based highland lake ecosystem services function evaluation system based on features of highland Lake. Based on the evaluation system, we assessed Fuxian lake watershed ecosystem services function based on In Vest model. Firstly, soil conservation function, water supply functions and biodiversity functions of the watershed was analyzed by quantization and spatial variation based on date of land use types in 1994 and 2014. Then, ecosystem services function of the watershed was evaluated. Finally, we made an important classification of the watershed and obtained the spatial distribution of general important area, important area and very important area. The main conclusions of the study are the following: 1. In 1994, the actual soil erosion in the watershed of Fuxian Lake was 12.69, the maximum value is 305.47, and the total amount of actual soil erosion is 83.24′104 t. After 20 years of development and change in 2014, the mean value of actual soil erosion modulus became bigger, and it is 12.80, the maximum value is 482.83. Total amount of soil erosion has also increased, and it is 83.61′104 t. In these two periods,the Soil erosion amount of Intensity of soil erosion in moderate or above are 51.61′104 t, 56.83′104 t, and it accounts for 62% of the total and 67.96% of the total. 2. There is a decline in soil retention capacity for 20 years, decreasing from 1685.15′104 t to 1652.18′104 t. However, soil retention capacity of different land use types is different, such as, woodland > tillage > grassland > urban > waters. 3. There is a decline about Water supply amount for 20 years. Water supply amount declining from 213 billion m3(1994) to 191 billion m3(2014). Water supply declined by 22 billion m3. 4. There is a decline about the average habitat quality index for 20 years, decreasing from 0.68 to 0.66. The decreased amount is 0.02. The area of average habitat quality index in 0.5-0.8 is decreasing, and the area of average habitat quality index in 0.2-0.5 is increasing. The results showed that habitat quality of the watershed has an obvious decrease. 5. There is an obvious change about the land use types of the watershed for 20 years. There is a most prominent change in building land area, increasing from 15.18km2(1994) to 39.53 km2(2014). The Increased area is 24.35 km2, and the growth rate is 160.41%. The increased area of woodland is 22.15 km2. The decreased area of tillage and grassland are 19.87 km2 ad 26.53 km2, respectively. 6. According to important classification of the watershed, the spatial distribution of general important area, important area and very important area was obtained. In 1994, very important area accounted for about 7.38% in the watershed. The area mainly distributed over the West and Northeastern side of the mountain, and few distributed in Watershed boundary. In 2014, very important area accounted for about 7.98% in the watershed, increasing 0.6%.
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