Evaluation Of Wetlands Ecological Service Function Based On 3S Technology In Xinjin County,Chengdu

The size of wetland ecological service function can directly reflect the health status of wetland,and how much value it can bring to human beings.In this study,the wetlands in Xinjin County were taken as the research object.With the multi-source remote sensing data and the GPS technology,the wetlands in Xinjin County was positioned,identified and classified.Then,the spatial and temporal changes of wetlands data in Xinjin County in 1996,2006 and 2016 were analyzed by GIS technology.According to the characteristics of wetlands in Xinjin County,an evaluation system of wetland ecological service function was established.Firstly,the importance index of each wetlands ecological service function was calculated in the system.Secondly,the monetary value of each wetlands service function in three periods was estimated by a series of methods.Then the comprehensive evaluation index is calculated by combining the monetary value of each function with the corresponding importance index,and the reasons for the change are analyzed.Finally,the CA-Markov model is used to predict the distribution and scale of wetlands in Xinjin County in 2026.After combining the predicted results with the function evaluation results of the three periods,the possible changes of wetlands ecological service function in Xinjin County in 2026 are predicted.The current situation and aspects of wetland utilization in Xinjin County are also predicted.At the same time,the problems are analyzed and suggestions for protection and utilization are given.The main research conclusions:(1)The total wetland area of Xinjin County in 1996-2016 showed a decreasing trend.The paddy wetland area reduction scale is the largest,the permanent river and the flooded wetlands area decreased relatively large.Because of the interference of human activities,the area changes of different types of wetlands varied greatly in different periods;(2)The monetary value of wetlands ecological services in Xinjin County declined gradually in 1996-2016,with the greatest decline in 1996-2006.The monetary value of the material production function of the paddy wetland and the rainwater storage function of the permanent river wetland declined greatly in the 1996-2006;(3)The comprehensive evaluation index of wetlands ecological service function in Xinjin County was also declined gradually in 1996-2016.The comprehensive evaluation index of the permanent river and the paddy wetlands have a relatively large degree of decline,but the comprehensive evaluation index of the irrigation ditches,the artificial lakes,agricultural/aquaculture ponds and other artificial wetlands increased gradually in 1996-2016,because of the improvement of construction and the enhancement of utilization in artificial wetlands;(4)The wetlands ecological service function of Xinjin County may increase slightly in 2026,because the functions of the irrigation ditches,the artificial lakes and the agricultural/aquaculture ponds may increase,and the wetlands protection and restoration work in Xinjin County will be more effective.