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348. Livingston, N.J. and T.A. Black. 1987b. Water stress and survival of three species of conifer
seedlings planted on a high elevation south-facing clear-cut. Canadian-Journal-of-Forest-
Research 17(9): 1115-1123.
Keywords: planting operations
tree/stand protection
tree physiology
tree/stand health
Abstract: Container-grown seedlings (1+0) of Douglas fir, western hemlock and Abies
amabilis were planted in spring 1981 and 1982 at 1150 m alt. on a 30 degrees S.-facing slope on
Mt. Arrowsmith, Vancouver Island, British Columbia. Treatments at planting included inclining
seedlings to the SW (thus shading the root collar with the foliage) and provision of shade cards
and/or irrigation. Control seedlings received no treatment. Seasonal and diurnal courses of twig
xylem water potential, turgor potential and osmotic potential were measured and the relation
between transpiration and soil water potential was determined. Seedling survival was recorded in
April 1982-84. Douglas fir seedlings showed a high degree of drought tolerance by considerable
osmotic adjustment that enabled seedlings to maintain turgor throughout the growing season.
Douglas fir seedlings thus survived severe drought and maintained daily transpiration rates that
were never less than 50% of those of irrigated seedlings. Transpiration rates were reduced,
however, on days of high vapour pressure deficits because of stomatal closure. Western hemlock
and, especially, A amabilis lacked both stress avoidance and stress tolerance mechanisms and
consequently suffered high mortality. In April 1984, untreated Douglas fir seedlings had 72-82%
survival, while treated seedlings had 81-95% survival. Shade cards and/or irrigation increased
survival of western hemlock and A. amabilis, but not to the rates shown by Douglas fir.
349. Lopushinsky, W. 1986. Effect of jellyrolling and acclimatization on survival and height growth of
conifer seedlings. Pacific-Northwest-Research-Station,-USDA-Forest-Service Research-Note
PNW-RN-438. 14 p.
Keywords: planting operations
growth
tree/stand health
tree physiology
Abstract: Jellyrolling is a preplanting treatment that involves dipping roots of seedlings in a
vermiculite/water slurry and wrapping the roots in wet burlap to form a roll. Studies were made at
14 sites in Oregon and Washington during 1984 using bare root seedlings of Pinus ponderosa, P.
contorta or Pseudotsuga menziesii. Results showed that there was no advantage in survival, ht.
growth or moisture stress from jellyrolling or acclimatizing (storage in a tent or shed at ambient
temp. for 24 h before planting) seedlings rather than dipping roots in a peat moss/water slurry at
the planting site.
350. Lopushinsky, W. and T.A. Max. 1990. Effect of soil temperature on root and shoot growth and on
budburst timing in conifer seedling transplants. New-Forests 4(2): 107-124.
Keywords: planting operations
tree morphology
tree phenology
tree physiology