IntensIve sIlvIculture - Forest Science Labs - Research Network ...

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Abstract: Actebia fennica [Dissimactebia fennica] have damaged Picea spp., Pinus
contorta, Pseudotsuga menziesii, Larix occidentalis and Populus tremuloides in recently planted
stands in British Columbia.
361. Malavasi, M.d.-M., S.G. Stafford and D.P. Lavender. 1985. Stratifying, partially redrying and
storing Douglas-fir seeds: effects on growth and physiology during germination. Annales-des-
Sciences-Forestieres 42(4): 371-383.
Keywords: nursery operations
reproduction
growth
Abstract: Douglas fir seeds collected from one coastal and one inland source in Oregon,
USA, were stratified at 3 degrees C for 28 days at 45% m.c., and then redried to 35% or 25% m.c.
and/or stored at 3 degrees C for 1 or 3 months. Redrying stratified seeds to 35% m.c. did not
affect the m.c. of embryos or gametophytes, but redrying to 25% m.c. reduced the m.c. of all seed
structures. Three months storage did not alter moisture distribution within seeds. Stratification
reduced the germination % of seeds from the inland source, but hastened germination speed of
seeds from both sources. Redrying stratified seeds to 35% and 25% m.c. increased seed vigour
and seedling length and dry weight. Storing stratified seeds without redrying them generally
reduced seed vigour. These results suggest that it would be advantageous to redry seeds to a range
of 25-35% m.c. directly before sowing in order to produce vigorous seedlings or allow expression
of stratification benefits.
362. Malavasi, U.C. and D.A. Perry. 1993. Genetic variation in competitive ability of some shadetolerant
and shade-intolerant Pacific Coast (USA) conifers. Forest-Ecology-and-Management
56(1-4): 69-81.
Keywords: planting operations
genetic relationships
growth
Abstract: Variability in growth response to stocking density and neighbour composition
was compared in Oregon among half-sibling families of four tree species representing two pairs
of shade-tolerant (ST) and shade-intolerant (SI) species, each pair from the same life zone. The
hypothesis was that the wider regeneration niche of ST species, which can become established
both in disturbed areas and within closed forests, would produce greater genetic variability among
families than occurs in SI species, which establish primarily in disturbed areas. Families of
western hemlock (Tsuga heterophylla - ST), coastal Douglas fir (Pseudotsuga menziesii - SI) and
Pacific silver fir (Abies amabilis - ST) varied in their responses to stocking density, but those of
noble fir (A. procera - SI) did not. As hypothesized, the ST species were significantly more
variable than SI ones, a result consistent with electrophoretic studies of ST and SI plants and
supportive of the hypothesis that at least a portion of genetic variability contained within
populations represents adaptation to variable environments.
363. Manter, D.K. and K.L. Kavanagh. 2003. Stomatal regulation in Douglas fir following a fungalmediated
chronic reduction in leaf area. Trees: Structure-and-Function 17(6): 485-491.
Keywords: tree/stand protection
tree physiology
tree/stand health