The effects of a range of thermoperiods and soil temperatures upon growth of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were studied. The seeds, of varieties glauca and menziesii, came from eight widely separated areas. Plants from both varieties made maximum growth with soil and air temperatures between 18 and 24 C during the 20 weeks of the study. Little requirement for diurnal fluctuation in temperature was evident. Low soil temperatures greatly reduced growth and hastened dormancy of plants grown under all the thermoperiods tested. The effects of a range of thermoperiods and soil temperatures upon the initiation of dormancy in var. menziesii and var. glauca seedlings grown under a 9-hour daily photoperiod also were inv...
AbstractDouglas-fir growth in the Pacific Northwest is thought to be water limited. However, discern...
This thesis reports the results of a study of soil temperature and seedling survival on a steep sout...
Seed from three sources of sideoats grama (Bouteloua curtipendula (Michx.) Torr.) were planted on on...
Graduation date: 1964This study was undertaken to determine the\ud effects of different chilling tre...
Most tree species in the temperate climatic zone (including Douglas fir) disperse seeds in autumn. S...
Climate change is causing significant shifts in tree species distributions to higher elevations and ...
Graduation date: 1980Three experiments were conducted on containerized seedlings to examine the shor...
Bud development under controlled-environment conditions in coastal Douglas-fir (Pseudotsugamenziesii...
Graduation date: 1968The photoperiodic responses of Douglas-fir (Pseudotsuga menziesii (Mirb,) Franc...
Climate warming advances the onset of tree growth in spring, but above- and belowground phenology ar...
The effect of scarification, ploughing and cross-directional plouhing on temperature conditions in t...
Graduation date: 1974Douglas-fir seedlings of a single seed source were grown in a nursery under thr...
One-year old seedlings of trembling aspen (Populus tremuloides Michx.), black spruce (Picea mariana ...
Woody species growing in temperate and boreal regions, like Norway spruce (Picea abies) have to ente...
Abstract: The purpose of this study was to investigate the effect of experimental warming using infr...
AbstractDouglas-fir growth in the Pacific Northwest is thought to be water limited. However, discern...
This thesis reports the results of a study of soil temperature and seedling survival on a steep sout...
Seed from three sources of sideoats grama (Bouteloua curtipendula (Michx.) Torr.) were planted on on...
Graduation date: 1964This study was undertaken to determine the\ud effects of different chilling tre...
Most tree species in the temperate climatic zone (including Douglas fir) disperse seeds in autumn. S...
Climate change is causing significant shifts in tree species distributions to higher elevations and ...
Graduation date: 1980Three experiments were conducted on containerized seedlings to examine the shor...
Bud development under controlled-environment conditions in coastal Douglas-fir (Pseudotsugamenziesii...
Graduation date: 1968The photoperiodic responses of Douglas-fir (Pseudotsuga menziesii (Mirb,) Franc...
Climate warming advances the onset of tree growth in spring, but above- and belowground phenology ar...
The effect of scarification, ploughing and cross-directional plouhing on temperature conditions in t...
Graduation date: 1974Douglas-fir seedlings of a single seed source were grown in a nursery under thr...
One-year old seedlings of trembling aspen (Populus tremuloides Michx.), black spruce (Picea mariana ...
Woody species growing in temperate and boreal regions, like Norway spruce (Picea abies) have to ente...
Abstract: The purpose of this study was to investigate the effect of experimental warming using infr...
AbstractDouglas-fir growth in the Pacific Northwest is thought to be water limited. However, discern...
This thesis reports the results of a study of soil temperature and seedling survival on a steep sout...
Seed from three sources of sideoats grama (Bouteloua curtipendula (Michx.) Torr.) were planted on on...