Title: The encroachment of exotic herbaceous plants into the Olympic National Forest.
Author: Heckman, Charles W.
Source: Northwest Science. 73(4): 264-276
Description: A floral survey in the Olympic National Forest and its surroundings revealed that a considerable number of introduced ruderal plant species have made deep inroads into the stands of native flora. Some of them, which are mainly of European and Asian origin, have been planted deliberately to stabilize the soil along roadsides and after clear cutting and burning. However, they have already established reproductive communities that are capable of spreading rapidly without additional human help as they have already done in almost all regions of the earth subject to a temperate climate. Plotting the data from the Geographical Information System. it was shown that 12% of an area totaling 388 km2, located mainly in the Olympic National Forest, was occupied totally or in large part by this mainly ruderal flora, which accounted for at least 50% and usually nearly 100% of all plants within the area on which they occurred. This represents a major qualitative and quantitative biogeographical alteration in the regional flora of a national forest generally considered to be only slightly affected by human activity.
View and Print this Publication (1.60 MB)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Heckman, Charles W. 1999. The encroachment of exotic herbaceous plants into the Olympic National Forest.. Northwest Science. 73(4): 264-276.