[Native Gardening] Urban Tree Cover Is Declining in the United States; Only Syracuse Had an Increase in Tree Cover and Sadly Only Because of Invasive Buckthorn

 



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Urban Tree Cover Is Declining in the United States; Only Syracuse Had an Increase in Tree Cover and Sadly Only Because of Invasive Buckthorn

by johnlampe

The Tree canopy in major cities has decreased by about 0.2 percent in recent years (mid-to-late 2000s).  This amounts to a loss of about 4 million trees a year.  This is the conclusion of an article, "Tree and Impervious Cover Change in U.S. Cities" by David J. Nowak and Eric J. Greenfield.  The article appears in the journal Urban Forestry & Urban Greening  (free access to full article).

Newell Park Oak Grove in Saint Paul Minnesota

As the study points out, "trees provide various benefits associated with air and water quality, building energy conservation, cooler air temperatures, reductions in ultraviolet radiation, and many other environmental and social benefits."  Trees therefore are vital to urban health and well-being.

Even in the one city where tree cover increased, Syracuse, the news was not necessarily good.  The tree canopy in Syracuse increased by one percent during the study period.  However, the increase was dominated by European buckthorn (Rhamnus cathertica), a nasty invasive tree/shrub.

johnlampe | February 24, 2012 at 10:46 am | Categories: Uncategorized | URL: http://wp.me/p1hcFD-7y
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