Graduate Thesis Or Dissertation
 

Multi-stage regeneration survey of coniferous regeneration on clearcuts in western Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0v838499t

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  • The purpose of this study was to investigate the use of a multistage with probability proportional to size (FPS) sampling design using aerial photography to sample coniferous regeneration on clearcuts. To date, aerial photography has not proven to be as economical (because of the high cost of specialized photography required) or accurate as a ground survey. Double sampling with regression using aerial photography and limited field measurements did improve the accuracy. A large land area was inventoried using three scales of aerial photography (1:60,000, 1:20,000 and 1:5,000) in the multistage sampling design, picking PPS samples and using double sampling with regression between the largest scale of photography and the field checked plots. For single clearcuts or small areas, the overall cost was excessively high due to specialized photography requirements. Using a multi-stage PPS sample design, an inventory of 67, 989 acres of clearcuts was accomplished at a total cost of $2,875. 00 or only 4.2 cents per acre, which is relatively inexpensive. This survey was only an inventory of the coniferous regeneration and did not show the actual Location of the clearcuts with the various stocking conditions. This information is useful to management personnel making management policy decisions, but is of Little use to the field forester. However, aerial photography can be useful to foresters in the field for mapping coniferous regeneration into broad classifications (stocked, non-stocked and questionable).
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