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- 2013412388 abstract "This report updates data and comparisons from previous reports (Curtis and others 2000, Curtis 2008) on a series of precommercial thinning and yield trials in high-elevation true fir-hemlock stands, using data from the 12 replicates for which 20-year data are now available. The stands were varying mixtures of Pacific silver fir (Abies amabilis (Douglas ex Loudon) Douglas ex Forbes), western hemlock (Tsuga heterophylla (Raf.) Sarg.), and noble fir (Abies procera Rehder). Trends noted in the 2008 report continue. Increment in top height was somewhat reduced at wide spacings. Volume increment and basal area increment increased as the residual number of trees increased. There was a small increase in diameter increment of the 80 largest trees per acre at wide spacing. Relative stand densities on the unthinned plots, as measured by stand density index (SDI) and relative density (RD), are still increasing; it appears that the maximum (not yet attained) is probably at least 20 to 25 percent greater than values observed in Douglas-fir.".
- 2013412388 contributor B12804166.
- 2013412388 contributor B12804167.
- 2013412388 created "2013.".
- 2013412388 date "2013".
- 2013412388 date "2013.".
- 2013412388 dateCopyrighted "2013.".
- 2013412388 description "Includes bibliographical references (pages 29-32).".
- 2013412388 description "This report updates data and comparisons from previous reports (Curtis and others 2000, Curtis 2008) on a series of precommercial thinning and yield trials in high-elevation true fir-hemlock stands, using data from the 12 replicates for which 20-year data are now available. The stands were varying mixtures of Pacific silver fir (Abies amabilis (Douglas ex Loudon) Douglas ex Forbes), western hemlock (Tsuga heterophylla (Raf.) Sarg.), and noble fir (Abies procera Rehder). Trends noted in the 2008 report continue. Increment in top height was somewhat reduced at wide spacings. Volume increment and basal area increment increased as the residual number of trees increased. There was a small increase in diameter increment of the 80 largest trees per acre at wide spacing. Relative stand densities on the unthinned plots, as measured by stand density index (SDI) and relative density (RD), are still increasing; it appears that the maximum (not yet attained) is probably at least 20 to 25 percent greater than values observed in Douglas-fir.".
- 2013412388 extent "32 pages :".
- 2013412388 hasFormat "True fir spacing and yield trials".
- 2013412388 identifier gpo37901.
- 2013412388 isFormatOf "True fir spacing and yield trials".
- 2013412388 isPartOf "Research Paper ; PNW-RP-590".
- 2013412388 isPartOf "Research paper PNW ; RP-590.".
- 2013412388 issued "2013".
- 2013412388 issued "2013.".
- 2013412388 language "eng".
- 2013412388 publisher "Portland, OR : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station,".
- 2013412388 relation "True fir spacing and yield trials".
- 2013412388 spatial "Cascade Range".
- 2013412388 spatial "Cascade Range.".
- 2013412388 spatial "Oregon".
- 2013412388 spatial "Oregon.".
- 2013412388 spatial "Washington (State)".
- 2013412388 subject "Forest thinning Cascade Range.".
- 2013412388 subject "Forest thinning Oregon.".
- 2013412388 subject "Forest thinning Washington (State)".
- 2013412388 subject "SD396.5 .C86 2013".
- 2013412388 subject "Trees Cascade Range Growth.".
- 2013412388 subject "Trees Oregon Growth.".
- 2013412388 subject "Trees Spacing Cascade Range.".
- 2013412388 subject "Trees Spacing Oregon.".
- 2013412388 subject "Trees Spacing Washington (State)".
- 2013412388 subject "Trees Washington (State) Growth.".
- 2013412388 title "True fir spacing and yield trials : 20-year update / Robert O. Curtis.".
- 2013412388 type "text".