The Study Of Ecological Function And Regionalization In Western Hangzhou Wetland

The ecological function regionalization of Western Hangzhou Wetland is mainly based on the geographic spatial zoning based on the analysis of wetland land cover type,the sensitivity of ecosystem and the evaluation of ecosystem service value.The purpose of this study is to determine the dominant ecological functions of wetlands in various regions of Western Hangzhou Wetland.So as to provide a scientific basis for optimizing the industrial layout,ecological balance and maintenance of the wetland.The main conclusions are as follows:(1)The multi-source data collected from unsupervised classification,,Landsat8data in blue,green,red,near infrared,NDVI,NDBI,MNDWI,veins,greenness,wetness,and elevation extracted with ENVI5.3,was analyzed using the CART algorithm's decision tree analysis to extract the land cover types of the Western Hangzhou Wetland.The accuracy was good.The wetland grassland,water area,and cultivated land in the west of Hangzhou were known.Forest land,construction land and unused land respectively accounted for 28.10%,16.49%,16.63%,7.16%,16.49%,and15.14%of the total area of the study area.(2)The sensitivity of the wetlands in the west of Hangzhou City shows a significant difference in spatial distribution.The area of insensitive wetlands is 22.693 km~2.It is mainly concentrated in the urban areas of the study area,namely the north of Xixi Wetland and the traffic trunk road west of Gudun Road.The mildly sensitive areas and moderately sensitive areas all mainly scattered in the northwest and southwest directions of the study area,with an area of 68.316km~2 and 134.488km~2 respectively.The land types are concentrated in the low paddy field and pasture grassland.The highly sensitive area is 64.198 km~2.It is mainly composed of various wetland groups and Guashan mountains.The extremely sensitive area is 1.365 km~2.It is scattered in ecologically sensitive comprehensive evaluation,mainly in the form of pixel points,and scattered lands are Nanhu Wetland and the central part of study area.(3)The dominant ecological function of the Western Hangzhou Wetland is shown as:climate,gas regulation,water conservation,soil formation,waste disposal,and recreation culture.According to the total value of ecosystem service value,according to the classification rule of natural discontinuity method,we divide the ecosystem service value of the west part of the city into three sub regions,which are low,general and high.Higher value area included:north of the Yuhangtang River,west of the Road X229,south of the Hangzhou high-speed S14,the rural land of the east of Tiaoxi.The general value area is:north Tiaoxi basin irrigation,forest mountains in the northeast and southwestern corners,national Road G56,the Nanhu Wetland,the Hemu Wetland,the Xixi Wetland along the Xixi Road.(4)This paper adopts the bottom-up zoning method to carry out the ecological function zoning of Western Hangzhou Wetland,and uses the classification of the small watershed of Western Hangzhou Wetland extracted from ArcGIS 10.2 as the basic unit type,dividing the wet west of the city into four important ecological function areas and A class of low-function areas.And put forward reasonable planning advice for each sub-region ecological type.