Relation of initial spacing and relative stand density indices to stand characteristics in a Douglas-fir plantation spacing trial

Research Paper PNW-RP-607
By: , and 

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Abstract

This report presents updated information on a 1981 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) plantation spacing trial at 33 years from planting. Stand statistics at the most recent measurement were compared for initial spacing of 1 through 6 meters and associated relative densities. There was no clear relationship of spacing to top height. Diameter, live crown ratio, and percent survival increased with spacing; basal area and relative density decreased with increase in spacing. Volume in trees ≥ 4 cm diameter was greatest at 2 m spacing, while utilizable volume (trees ≥20 cm dbh) was greatest at 4 m spacing. Live crown ratio decreased and total crown projectional area increased with increasing relative density indices. Total crown projectional area was more closely related to relative density than to basal area.

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Additional publication details

Publication type Report
Publication Subtype Federal Government Series
Title Relation of initial spacing and relative stand density indices to stand characteristics in a Douglas-fir plantation spacing trial
Series title Research Paper
Series number PNW-RP-607
Year Published 2016
Language English
Publisher U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station
Contributing office(s) Northern Prairie Wildlife Research Center
Description iv, 27 p.
Country United States
State Washington
Other Geospatial Gifford Pinchot National Forest, Trout Creek, Wind River Experimental Forest
Online Only (Y/N) N
Additional Online Files (Y/N) N