Tree and impervious cover change in US cities
Tree and impervious cover change in US cities
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DOI：
10.1016/j.ufug.2011.11.005
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发表时间：
2012-01-01
影响因子：
6.4
通讯作者：
Greenfield, Eric J.
中科院分区：
文献类型：
--
作者：
Nowak, David J.;Greenfield, Eric J.
成对的航空照片进行了解释，以评估最近的变化，在树，不透水和其他覆盖类型在20个美国城市，以及在美国境内的城市土地。全国的结果表明，美国城市地区的树木覆盖率正在以每年约7900公顷或400万棵树的速度下降。在20个被分析的城市中，有17个城市的树木覆盖率在统计学上显著下降，而16个城市的不透水覆盖率在统计学上显著增加。只有一个城市（锡拉丘兹，纽约州）有一个统计上显着增加的树木覆盖。城市树木覆盖率平均每年减少约0.27%，而不透水表面平均每年增加约0.31%。由于树木覆盖率提供了一个简单的手段来评估整体城市森林资源的规模，监测树木覆盖率的变化是很重要的，以了解树木覆盖率和各种环境效益可能会发生变化。数字航空图像的照片判读可以提供一种简单而及时的手段来评估城市树木覆盖变化，以帮助城市监测维持理想的城市树木覆盖水平的进展情况。由爱思唯尔有限公司出版。
Paired aerial photographs were interpreted to assess recent changes in tree, impervious and other cover types in 20 U.S. cities as well as urban land within the conterminous United States. National results indicate that tree cover in urban areas of the United States is on the decline at a rate of about 7900 ha/yr or 4.0 million trees per year. Tree cover in 17 of the 20 analyzed cities had statistically significant declines in tree cover, while 16 cities had statistically significant increases in impervious cover. Only one city (Syracuse, NY) had a statistically significant increase in tree cover. City tree cover was reduced, on average, by about 0.27 percent/yr, while impervious surfaces increased at an average rate of about 0.31 percent/yr. As tree cover provides a simple means to assess the magnitude of the overall urban forest resource, monitoring of tree cover changes is important to understand how tree cover and various environmental benefits derived from the trees may be changing. Photo-interpretation of digital aerial images can provide a simple and timely means to assess urban tree cover change to help cities monitor progress in sustaining desired urban tree cover levels. Published by Elsevier GmbH.