Abstract:

With the development of social economy, the contradiction between resources development and environment protection in Yancheng coastal wetlands is becoming increasingly conspicuous.And the material composition and spatial pattern of this coastal wetlands have changed apparently.Therefore,structure optimization has become an important part of wetland study.Based on the goal of maximizing of the economic and ecological benefits,this paper adopted a model calling multiobjective programming，to build a series of constraints from the two aspects of social economic and ecological environment,in order to study the landscape structure optimization in Yancheng coastal wetlands.The result showed that the cultivated area increased 17 211.80 hm2,taking as much as 696% of the total.It was the largest increase proportion,mainly because people reclaimed and developed the tidal flat for farm land utilization.Native vegetation area were enlarged by reclaiming shoals for reed and limiting the spreading of Spartina.Meantime,mud flats area declined by 25 804.73 hm2,of which percentage changed significantly to 1043%.Economic efficiency improved by an increase of 642 000 000 yuan,at the same time,ecological benefit increased which made the overall benefits enhanced significantly.Also the wetland landscape structure was optimized.〖