Research On Ecological Function Regionalization In The Yangtze River Delta

To coordinate economic development and ecological environment,to realize the harmonious development of environment and economy is one of the important problems facing the development of modern social economy in China.The Yangtze river delta is China's first big economic zone,has developed into the world's sixth largest urban agglomeration,but at the same time,the rapid development of social economy also faces a series of environmental problems such as deforestation,biodiversity reduction,environmental degradation and so on.Combined with the actual situation of the Yangtze river delta,the investigation about the present situation of ecological environment in the study area,on the basis of using ARCGIS technology about the present situation of ecological environment,ecological sensitivity and ecological importance on the analysis of the spatial distribution of the service function.According to the basic principles of ecological functional zoning,the ecological functional zoning of the Yangtze river delta was carried out,and the direction of the problem was proposed for the main ecological problems of the corresponding ecological functional areas.First,classification by remote sensing interpretation,the land use status of Yangtze River Delta in 2000 and 2014 is divided into six types,respectively,the cultivated land,woodland,grassland,water area,construction land and unused land.The area of arable land decreased by 185122.36 km~2 from 2000 to 2014,while the area of forestland increased by 22676.95 km~2 from 2014 to 2000.Similarly,the area of grassland in the study area in 2014 increased by 18 percent compared with 2000.Construction land and unused land are increased.The overall trend is that the area of cultivated land is converted into woodland,construction land,and unused land.Among them,the arable land area of 2014 was 56894.93 km~2,accounting for 37.31%,and the land area was 60201.73 km~2,accounting for 39.48%.The grassland area is1347.71 km~2,accounting for 0.88%.The water area is 15361.56 km~2,accounting for10.07%.The construction land area is 18582.15 km~2,which accounts for 12.19%;The unutilized area was 99.46 km~2,accounting for 0.07%.Second,the choice of land use,precipitation,soil texture,the moist index,annual average temperature,environmental conservation,river and road buffer nine regional representative of ecological factors,to study the soil erosion,soil salinization,desertification,habitat sensitivity,water environmental conditions and human disturbance sensitivity,climate sensitive ecological sensitivity assessment seven aspects,the ecological sensitive zone can be divided into five ecological sensitive area,which is extremely sensitive,highly sensitive area,moderately sensitive area,mild sensitive area and no sensitive area.The detailed analysis results:the area of very sensitive area is 16817 km~2,accounting for 15.21%of the total area of the Yangtze river delta.The area of the highly sensitive area is 25280 km~2,accounting for22.87%of the Yangtze river delta and the northeast of the Yangtze river delta and the local area of the east and northwest.The area of moderate sensitive is 33579 km~2,accounting for 30.38%of the total area,located in the middle part of the Yangtze River delta and the coastal area of the water system.The area of the mildly sensitive is 20177 km~2,the area of the non-sensitive is 14693 km~2,and the two sensitive areas account for 31.54%of the total area,which is distributed in the southern and central parts of the Yangtze river delta.Third,according to the characteristics of the Yangtze River delta ecosystem,to choose biodiversity conservation,water conservation,soil conservation importance for evaluation of importance of ecological service function.According to the importance index,it is compartmentalized into very important,medium important,more important and generally important.The area and proportion of the ecosystem services were 24156 km~2,21.85%and 26975 km~2,24.4%.Both of them are accounted for nearly 50%of the total area in the study area,and the area and proportion of the important regions were the largest in each section,It is 39780 km~2 and 35.99%.Generally,the area and proportion of important areas are the smallest,which is 19635km~2 and 21.85%.In the end,according to the characters of natural landscape,the Yangtze river delta were divided into three ecoregions,which is Agricultural ecological zone of northern plain,central low mountain hilly ecological area and Southern hilly ecological zone.Based on the evaluation of ecological environment sensitivity evaluation,importance evaluation of services and estimate of land use status evaluation in Yangtze river delta,to be divided into five ecological function areas,11ecological function area.Some suggestions about ecological protection were put forward.