. Growth and soil moisture in thinned lodgepole pine. Trees Growth; Soil moisture; Lodgepole pine. was surprisingly small and could easily be accounted for on the basis of variation among sampling points within plots. —' The pumice overlays an older, predominantly sandy loam soiL The older soil profile averages 15 inches in depth to a compacted layer similar in texture to the soil above it. This layer defines the lower limit of rooting depth (fig. 2). Total depth of soil, both pumice and buried sandy loam, ranged from 42 to 62 inches and averaged 52 inches at the 12 locations sampled. Site ind
. Growth and soil moisture in thinned lodgepole pine. Trees Growth; Soil moisture; Lodgepole pine. was surprisingly small and could easily be accounted for on the basis of variation among sampling points within plots. —' The pumice overlays an older, predominantly sandy loam soiL The older soil profile averages 15 inches in depth to a compacted layer similar in texture to the soil above it. This layer defines the lower limit of rooting depth (fig. 2). Total depth of soil, both pumice and buried sandy loam, ranged from 42 to 62 inches and averaged 52 inches at the 12 locations sampled. Site index for the study area as a whole averages 72 feet at age 50 years for the tallest lodgepole pine tree per one-fifth-acre plot (read from Dahms (1964) site index curves^-/). Actual tallest tree height at age 35 years averaged 52. 5 feet, ranging from 49. 5 to 56. 2 feet. —^ These heights are considerably above averages for central Oregon lodgepole pine at 35 years. Figure of this windthrown ponder- osa pine tree abruptly stopped their down- ward penetration when they encountered the compacted soil layer. This tree had been growing immediately adjacent to the lodge- pole pine thinning area, on similar Most of the sampling points consisted of auger holes drilled to accommodate access tubes for measuring soil moisture with the neutron probe. Pumice depth measurements were taken in the holes used for each of the first three tubes installed on each of the original 10 plots. Other depth-of-pumice measurements came from a large soil pit and from several smaller ones dug in 1970. 3Site index 72 is substantially higher than that reported by Dahms (1967) because an average of three tallest trees per plot was used to estimate 1959 site index. This was done to strengthen comparisons between plots in a very young stand. Had the single tallest tree per plot approach been followed in 1959, the answer would have been site index 70. Use of the single tallest tree per one-fift
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectsoilmoisture
