. Growth and soil moisture in thinned lodgepole pine. Trees Growth; Soil moisture; Lodgepole pine. as more data become available from existing studies, stand models that will permit comparisons between various management alternatives should be possible. Understory Vegetation Understory vegetation did not develop vigorously on the Twin Lakes plots (fig. 17). Amount of ground covered in 1970, 1 1 growing seasons after the first thinning, ranged from a low of 3 percent on one plot to a high of 27 on another and averaged 17. 3 percent. If there were any effect of thinning-established tree density
. Growth and soil moisture in thinned lodgepole pine. Trees Growth; Soil moisture; Lodgepole pine. as more data become available from existing studies, stand models that will permit comparisons between various management alternatives should be possible. Understory Vegetation Understory vegetation did not develop vigorously on the Twin Lakes plots (fig. 17). Amount of ground covered in 1970, 1 1 growing seasons after the first thinning, ranged from a low of 3 percent on one plot to a high of 27 on another and averaged 17. 3 percent. If there were any effect of thinning-established tree density regimes on under- story vegetation, it was small and completely masked by differences that existed prior to Figure plot of the middle density (400 trees per acre) with almost no understory vegetation. Photograph taken just before the 1969 thinning. Snowbrush, other shrubs, grasses and sedges, and forbs ranked in that order in amount of crown cover. Snowbrush was recorded on only three of the 1 2 plots, but on one it covered 21 percent of the ground. So/7 Moisture Average annual soil moisture withdrawal was greater at the higher density levels over the period 1 961-70 (fig. 18). Differences between levels were significant at the 95-percent confidence level. This is the kind of result that generally is to be expected where forest vegetation density is reduced (Packer and Laycock 1969). 23. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dahms, Walter G. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectsoilmoisture
