. Development over 25 years of Douglas-fir, western hemlock, and western redcedar planted at various spacings on a very good site in British Columbia. Douglas fir British Columbia; Western hemlock British Columbia; Western redcedar British Columbia; Tree planting British Columbia. Introduction Influences of initial spacing on stand development are of considerable economic and biological importance. Much has been learned from a study of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) at the Wind River spacing trials on site IV land in southwest Washington (Reukema 1979), but foresters in the
. Development over 25 years of Douglas-fir, western hemlock, and western redcedar planted at various spacings on a very good site in British Columbia. Douglas fir British Columbia; Western hemlock British Columbia; Western redcedar British Columbia; Tree planting British Columbia. Introduction Influences of initial spacing on stand development are of considerable economic and biological importance. Much has been learned from a study of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) at the Wind River spacing trials on site IV land in southwest Washington (Reukema 1979), but foresters in the Pacific Northwest lack published data on establishment and early growth of Douglas-fir and associated species on good sites. This paper reports development of Douglas-fir, western hemlock (Tsuga heterophylla (Raf.) Sarg.), and western redcedar (Thuja plicata Donn ex D. Don) on site I land at the University of British Columbia (UBC) Research Forest near Maple Ridge (Haney), British Columbia. The results summarized in various progress reports (Smith 1983, Walters and Smith 1973) have been synthesized and further evaluated for this paper. Our information should be useful to managers interested in growing trees to meet a wide range of managerial objectives. The Study The UBC Research Forest is north of Maple Ridge, in the Fraser River valley; latitude The Study Area 49°18' N., longitude 122°35' W. The five trials are all within an area of less than 45 ha, and the most distantly separated plots are less than 1 km apart (fig. 1). The area is about 180 m above sea level on land that slopes gently to the southwest The soil is a gleyed, micro-podzol with mull humus and with sandy loam to loamy sand texture. Precipitation includes an average of 2040 mm of rain and 1260 mm of snow per year, which yields an annual water equivalent of 2166 mm; summer droughts are common. Daily temperature averages about 9° meters feet 200 400 600 800 Figure 1—Relative locations of the spacing trial
Size: 1392px × 1794px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
