Assessment on Comprehensive Ecological Benefit of the Main Coastal Shelterbelt in Pingtan Island

Based on the data collected from coastal shelterbelt field in Pingtan Island, index system and evaluation model for the assessment of comprehensive ecological benefit was established, which consists of criterion layer (soil improvement, carbon fixation and oxygen release, climate regulation and water and soil conservation) and indicator layer (reducing wind speed, fixed carbon content, soil bulk density and etc. more than 10 indicators). Analytical Hierarchy Process (AHP) method was used to evaluate comprehensive ecological benefits of Casuarina equisetifolia , Pinus thunbergii, Pinus elliottii and Acacia confuse. The result indicated that four kinds of windbreaks have a large ecoefficiency, the order of ecological benefits index is Casuarina equisetifolia>Pinus elliottii>Pinus thunbergii>Acacia confuse. Therefore some scientific suggestions were put forwarded in this paper and which provided basic foundation for planning, overall arrangement, species selection for coastal shelterbelt project in Pingtan Island.