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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

期刊文章

Shifts and future trends in the forest resources of the Central Hardwood Region  [2003]

Schmidt, Thomas L.; McWilliams, William H.;

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Forests in the Central Hardwood region are undergoing change in terms of area, volume, species composition, and forest structure. These forests are dominated by deciduous species; are increasing their average stand size, volume, and age; and, are experiencing woody plant species replacement as shade intolerant species are being replaced by more shade tolerant species. As changes progress, concerns are being raised regarding the potential for these lands to produce the wide array of benefits associated with timberland. Changes in the forest resource as well as changes in land ownership and management objectives have repercussions for wildlife species, timber industries, recreational interests, and the wide array of other benefits reaped from this invaluable resource.
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2013
起始页:
21
结束页:
31
出版者:
St. Paul, Minn. : North Central Research Station, Forest Service, U.S. Dept. of Agriculture, 2003.
所有题名:
" Shifts and future trends in the forest resources of the Central Hardwood Region "
其它:
" Includes references "

来自期刊

13th Central Hardwood Forest Conference proceedings of a conference held at the University of Illinois Urbana-Champaign, Illinois, April 1-3, 2002 / edited by: J.W. Van Sambeek ... [et al.]