Charles A. Wierman's research while affiliated with Boise State University and other places
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Publications (5)
Seven silvicultural treatments were applied to a 15-20-yr-old, naturally regenerated Thuja plicata stand growing on a poor-quality site in W Washington. Treatments were: unthinned, unfertilized (untreated); unthinned, fertilized with ammonium nitrate, dicalcium phosphate, and potassium sulfate; thinned, unfertilized; thinned, fertilized with urea;...
Advances in forest practices during the past few decades have been made in the midst of public debate over the role of forestry. It is time to assess the state of the art of silviculture and to project its evolution for the next 30 years - to reinforce the use of sound practices now employed and to shed outdated concepts and practices. To a large e...
The pattern of vertical stratification in mixed Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) and western hemlock (Tsugaheterophylla (Raf.) Sarg.) stands was documented by observing tree interaction patterns on temporary plots in stands between 35 and 80 years old. It was found that Douglas-fir predictably dominated the hemlock. Several possibl...
Thesis (Ph. D.)--University of Washington. Bibliography: leaves 58-60.
Citations
... Broadcast fertilization with ammonium nitrate several months before planting Douglas-fir resulted in increased growth of seedlings in two stands through their eighth and ninth growing seasons, respectively (Thies and Nelson, 1988;Thies et al., 1994). Broadcast fertilization of 225 kg N ha À1 is practiced in some Pacific coast stands of young to middle-age Douglas-fir (Bengtson, 1979;Tappeiner et al., 1986). Although duration of response to fertilization will differ owing to many factors, annual volume-growth response gradually approaches zero 10-15 years after treatment (Miller and Fight, 1979). ...
... This stand development pattern associated with crown abrasion for these two species was present in both natural [22] and planted stands [26]. Similar crown abrasion effects in mixed-species deciduous stands have been reported in Germany [15] and in New England, USA [27], with mixed deciduous species, in mixed conifer stands in the Pacific Northwest, USA [28], and with mixed coniferdeciduous species in Japan [12]. ...
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... It has been assumed that the effect on production decreases with repeated fertilisation (Jacobson and Nohrstedt, 1993), but (Jacobson and Pettersson, 2001) and (Pettersson and Högbom, 2004) found that while repeated, it maintained or even increased the effect of biomass growth, at least at longer intervals between nutrient supply. Sometimes additional growth was obtained when N was applied at relatively high and frequent rates and with phosphorus (P) and potassium (K) (Albrektson et al., 1977;Dralle and Larsen, 1995;Harrington and Wierman, 1990;Tamm et al., 1999). The reason for supplying forests with nutrients may not only be to increase yields but also to dispose of post-agricultural waste which was the case in the Iława forest area (Chojnacka-Ożga et al., 2022;Ciepielowski et al., 1999;Koprowski et al., 2015). ...
... Concerns over the long-term supply of timber from coastal forests have focussed attention on the management and productivity of young regenerating natural stands and plantations (Ruth and Harris 1979;Harrington and Wierman 1985;Omule and Britton 1991;Klinka and Brisco 2009). Fertilization has the potential to increase rates of growth and stand development in regenerating forests (Lee 1968;Debell 1975; B.C. Ministry of Forests, Lands and Natural Resource Operations 2017 1 ), and fertilization trials have been established throughout the coast to provide information on responses of dominant tree species to various fertilizer blends and application rates (Debell 1975;Webster et al. 1976;Omule and Britton 1991;Prescott and Weetman 1994). ...
