The Research Of Land Ues Change And Its Ecological Effect In Southern Coastal Saltwater-intruded Area Of Lai-zhou Bay

The south coast of Lai-zhou Bay, which is one of the most typical areas of saltwater intrusion in China, is also a sensitive and occurring frequently region of the LUCC in the effect of the change of natural environment and human activities, and the ecological effect changes obviously. This article wants to reveal the changes of ecological environment in the areas of saltwater intrusion and give suggestion to regional sustainable development by quantitative study of the changes of land use/coverage and the ecological service value since last century 90's.Saltwater intrusion area of the south coast of Lai-zhou Bay consists Shou-guang, Han-ting, Chang-yi of Wei-fang City in this article. According to the remote sensing image of 1992,2000,2004 and non- remote sensing date, The paper reveals the situation of land use change at the support of ERDAS IMAGING, ArcMap. The results show that: The areas of land use types have changed varying degree from 1992 to 2004.Farmland which have the largest area have higher reduction by 6118.06 hm~2; The beach wetland is the land use type that has the biggest reduction and amplitude and it reduces by 17601.9 hm~2;Salt field is smaller than farmland but its area increases rapidly in 10 years; In addition, the area of the settlement and construction land is larger and expend constantly; The other land use types is small. The area of woodland and waters reduced but grassland and unutilized land increased.According to the actual situation, the paper makes a further revision to the coefficient of ecological service value and analysis the ecological effect based on the research result of Constanza and Xie gaodi. According to the different types of land use, the analysis result of ecological service value shows that: The beach wetland has the highest ecological service value. Next is farmland, salt field, waters, grassland, woodland, unutilized land. The ecological service value of settlement and construction land is negative number. According to the different ecological service values, sorting the magnitude of the value as: waste treatment > climate regulation > water conservation > food production > soil formation and protection >amusement culture>biodiversity protection>gas regulation> material; The total ecological service value trends to reduce from 1992 to 2004. The ecological service value of every land use types reduce. The beach wetland which leads the development of the ecological service value of study area has the biggest decrement and range, next is farmland, settlement and construction land, grassland, unutilized land. The values of salt field, waters have a little increase. The values of every type of ecological service reduce also. The ecological service value has huge difference between salty-water region and transition region and the multiple of ecological service value of salty-water region is up to 10.253 relative to transition region. The average of ecological service value of the salty-water region is more than transition region's, but the disparity is narrowing.