Graduate Thesis Or Dissertation
 

Description and classification of the forests of the upper Illinois River drainage of Southwestern Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r494vq81c

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  • The purpose of this study was to develope a plant community classification within the Siskiyou mountains, a small range within the Klamath geological province well known for its geologic and floristic diversity. Forest land managers have expressed the need for identification of basic Land classes that will aid in the assessment of the applicability of research results, aid the assessment of the results of management practices, and aid in the prediction of management techniques needed to produce specific results. Because of the extreme diversity, such a classification must be developed locally by intensive sampling and rigorous analytical techniques. Thus cluster analysis, discriminant analysis and canonical analysis were used in combination with a classification table to classify and analyze 250 plotes taken in 100,000 acres the Upper Illinois River drainage. Seventeen communities based on the dominant climax species were subdivided from six major vegetation groups. The six vegetation groups, the Abies magnifica shastensis, the Abies concolor, the Chamaecyparis lawsoniana, the Pseudotsuga menziesii, the Lithocarpus densiflora, and the Pinus jefferyi were separated on the basis of the dominate tree in both the understory tree layer and overstory tree layer. A description of each community, the basic classification unit, is given. The descriptions include: the results of the classification techniques and their meaning, the relative environment of each community, species relationships for the more common species in each community, estimates on their relative productivity, their successional status, and keys for mapping the communities and identifying stands. The geologic and floristic history of the Klamath province is complex, but it provides a basis for understanding today's flora. The affects of the Applegate, Galice and Nevadan episodes which were later modified by the ice advances and the Xerothermic period are presented. The affects of the major Tertiary plant migrations are also presented.
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