Tolerance of seedlings of ponderosa pine, Douglas-fir, grand fir, and Engelmann spruce for hight temperatures
Seidel, K. W.
1986.
Northwest Science, Volume 60, Number 1: 1-7
Journal Article
Transfer Guideline: Recommendation
Pacific Northwest, USA
The heat tolerance of 2- to 4-week old seedlings of ponderosa pine (Pinus ponderosa Dougl. ex Laws), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), grand fir (Abies grandis (Dougl. ex D. Don) Lindl.), and Engelmann spruce (Picea engelmannii Parry ex Engelm.) was determined and compared by exposing them to various time-temperature combinations in a "dry water bath" apparatus. Isosurvival curves indicating the time-temperature combinations that resulted in approximately equal survival were constructed for each species. Small (2 to 4 C) but significant differences in height tolerance were found among species with ponderosa pine having the greatest tolerance and Engelmann spruce the least. Douglas-fire and grand fir were generally intermediate in heat tolerance.