上海浦东新区城市森林树冠覆盖分析

应用ArcGIS判读2007年遥感影像,分析了上海浦东新区(原)的树冠覆盖。研究区总面积为533 km2,建成区为252 km2。结果表明,研究区现有树冠覆盖率7.02%,建成区树冠覆盖率10.27%;其中研究区的潜在树冠覆盖(技术层面)可达8.68%~9.79%,建成区潜在树冠覆盖率可达到11.49%~12.3%。自商业中心向东树冠覆盖表现城郊梯度的变化,在建成区内自中心城区到城郊边树冠覆盖呈递增趋势,并在外环林带区域达到最高值,之后在城市外侧明显递减。不同功能区的树冠覆盖同样呈现明显差别,外环林带最高,随后是公园、道路、居住区,商业区则最低。根据树冠覆盖估算,浦东新区约有乔木368万株,其中建成区有255万株。建成区至少可增植乔木30万株。

Analysis of urban tree canopy cover in Pudong New District of Shanghai

The 2007 Spot image of Pudong New District of Shanghai was analyzed to estimate the tree canopy cover (TCC) based on land use categories by using ArcGIS. A transect from commercial center to suburb (from west to east) was made to compare gradient variation of tree canopy cover as well. The studied area covers 533 km² in total, of which, built up area occupies 252 km². The results showed that the tree canopy cover was 7.02% in the area, and 10.27% in the built up area. The potential tree canopy cover (technical) could reach to 8.68%-9.79% in the total area, and 11.49%-12.3% in the built up area; TCC gradient based on transect analysis showed that the TCC increased gradually from west to east in the built up area, and reached to its highest at the ring forest then reduced significantly. TCC were obviously significant for different land uses, which was highest for the ring forest use, then for park, road,in turn, and it was lowest for resident and commercial use . It is estimated that there are 3.68 million trees in Pudong New District, and 2.55 million trees in the built up area. At least 0.3 million trees can be added in the built up area.