Variation in air and soil temperatures in forest communities on the H. J. Andrews Experimental Forest, 1970-1972

Best copy available.Air temperatures at i m and soil temperatures at 2C cm are reported for\ud twenty-one forest stands in the central Western Cascader of Oregon. Records\ud began in 1970 for some stands, in 1971 or 1972 for most. Temperature Growth\ud Index for a stand, based on temperature effects on Douglas-fir seedling growth,\ud varies from 32 to 101, and ordinates the stands similarly for 1971 and 1972.\ud However, the index is not closely related to stand position in a vegetation\ud ordination. A strong nocturnal temperature inversion causes summer minima to\ud increase with elevation up to 1100 m, All lapse rates are low up to 1100 m.\ud Comparisons with studies of montane forests in Arizona and Colorado show that\ud the sites studied here lack the temperature variation, particularly the low\ud minima, characteristic of the other areas