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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.

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Journal Article

Journal Article

Physical and historical determinants of the pre- and post-settlement forests of northwestern Pennsylvania  [2003]

Whitney, G.G.; DeCant, J.P.;

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Our analysis of the early land survey records and more recent U.S. Forest Service inventory data documents the changing nature of northwestern Pennsylvania's forests following European settlement. Initially, the northern portion of the four-county study area was dominated by forests of Fagus grandifolia Ehrh. and Acer saccharum Marsh. associated with the richer, finer-textured soils of the rolling Glaciated Appalachian Plateau. Up to 80% of the region was cleared for farming in the 19th century. Marginal farmland was abandoned and reverted to forests in the 20th century. Fires and leached, nutrient-poor soils favored the dominance of Quercus spp. and Castanea dentata (Marsh.) Borkh. in the presettlement forests of the rugged Unglaciated Appalachian Plateaus to the south. The rough nature of the terrain discouraged the early clearance of the plateaus' forests. The advent of the petroleum industry and its insatiable demand for barrels in the 19th century, however, assured the selective removal of the larger (>20 in. (50 cm) DBH) Quercus alba L. from the region's woods. The increasing homogeneity of northwestern Pennsylvania's forests today is due to the sharp decline of the more distinctive indicator species and the rise of a number of opportunistic old-field or gap species, notably Prunus serotina Ehrh. and Acer rubrum L.
From the journal
Canadian journal of forest research
ISSN : 0045-5067

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
33
Issue:
9
Start Page:
1683
End Page:
1697
All titles:
"Physical and historical determinants of the pre- and post-settlement forests of northwestern Pennsylvania"@eng
Other:
"Includes references Summary in French."
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
33
Issue:
9
Start Page:
1683
End Page:
1697
All titles:
"Physical and historical determinants of the pre- and post-settlement forests of northwestern Pennsylvania"@eng
Other:
"Includes references Summary in French."