People & trees - Assessing the US urban forest resource

被引:0
|
作者
Nowak, DJ [1 ]
Noble, MH
Sisinni, SM
Dwyer, JF
机构
[1] SUNY Coll Environm Sci & Forestry, USDA, Forest Serv, NE Forest Expt Stn,Moon Lib 5, Syracuse, NY 13210 USA
[2] Groundwater Qual Bur, New Mexico Environm Dept, Santa Fe, NM USA
[3] US Forest Serv, USDA, N Cent Res Stn, Evanston, IL USA
关键词
inventory; urban forestry;
D O I
10.1093/jof/99.3.37
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Urban areas in the conterminous United States doubled in size between 1969 and 1994, and currently cover 3.5 percent of the total land area and contain more than 75 percent of the US population. Urban areas contain approximately 3.8 billion trees with an average tree canopy cover of 27 percent. The extent and variation of urban forests across the 48 states are explored to help build a better understanding of this significant national resource. Urbanization and urban forests are likely to be a significant focus of forestry in the 21 st century.
引用
收藏
页码:37 / 42
页数:6
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