上海浦东新区城市绿色廊道景观格局分析

应用ArcGIS判读2007年遥感影像,勾绘上海浦东新区(原)道路、水系及植被廊道,分别名为灰色、蓝色及绿色廊道。同时依据绿色廊道的属性,划分为道路绿色廊道、河流绿色廊道及环城绿带,分析各类绿色廊道的结构及网路特点,研究区面积533 km2。结果表明,研究区灰色、蓝色及绿色廊道的面积分别占研究区面积的7.37%、3.86%和15.07%;绿色网络面积101.15 km2,约占研究区面积的19%,其中绿色廊道面积80.27 km2,附着节点面积20.88 km2;绿色廊道密度为1.99 km.km-2,其中,绿色道路廊道长685.39 km,密度1.29 km.km-2,又以主干道绿色廊道的比重大;环城绿带长为绿色廊道总长的8%,但面积占绿色廊道总面积的40.4%,绿色河流廊道面积最小,约为14.91%。另外,绿色廊道的网络线点率、环通度及连通度分别为1.301、0.196和0.478,说明网络结构较为简单;相比较绿色道路廊道网络结构比其它类型复杂,还为研究区绿色廊道建设提供建设性的建议。

Analysis of landscape patterns of the green corridors in Pudong New District of Shanghai

The 2007 Spot image of Pudong New District of Shanghai was interpreted using ArcGIS. The corridor system was comprised of road, river and channel, and covered 533km² in area. The vegetation was drawn and named as gray corridor, blue corridor and green corridor respectively, and then the green corridor was subdivided into road green corridor, river green corridor, and green belt corridor. Based on the database built in GIS (Geographic Information System), the structure and network characters of green corridor were analyzed as well. The results indicated that areas of gray corridor, blue corridor and green corridor were respectively occupied 7.37%, 3.86% and 15.07% of the area. The total area of the green corridor network was 101.15 km², composed of 80.27 km² of green corridor and 20.88 km² of attached green nodes, which could reach to 19% of this area. The green corridor density was 1.99 km·km^-2, of which the road green corridor was 1.29 km·km^-2, and the main road green corridor had a relatively high occupation. The green belt corridor was 51 km in length, which occupied 8% of total green corridor and 40.4% of the whole green corridors in area. The green river corridor had small area, which only occupied 14.91% of the total green corridor area. The green network structure and pattern was described as follows: the green network linkage, porosity and circuitry, connectivity was respectively 1.301, 0.196 and 0.478, and the structure of green network in Pudong New District was uncomplicated. The green road network was more complex in structure than that of other corridor types. Authors also provide some proposals on green corridor building.