Optimization of wetland landscape patterns based on ecological function evaluation:a case study on the coastal wetlands of Yancheng,Jiangsu Province

Identification of the relationships between landscape and ecological processes is one of key issues of landscape ecology.Landscape pattern aims to build optimized landscape which could make landscape eco-efficiency maximization and stabilization.The Yancheng coastal wetlands were chosen for the study.Based on application of remote sensing(RS)and geographical information system(GIS),the functions of wetlands landscape ecosystem services were evaluated firstly,then applying the resistance model,some key ecological function zones were identified,and the optimization of wetlands landscape pattern were put forward in the study area.The research findings include:(1)Ecological process and functions of wetlands in the coastal area were different in spatial distribution.(2)Based on an accumulative cost intensity model,and the calculation of the cost intensity,and the sources identification,the critical ecological positions,corridors,and sources were designed in the study area,and the landscape pattern optimization further discussed.The conclusions includes:(3)Optimization of wetlands landscape pattern improved connectivity of landscape.The critical ecological positions for connectivity of landscape near the bays of the Old Huanghe River estuary and Dafeng Port was the most important,and it was the first primary object to be optimized.(4)The optimized landscape pattern for the Yancheng coastal area is to strengthen protection of nature resources,maintain high landscape connectivity,and promote the sustainable development in land-use and environmental protection.