. Response of dwarf mistletoe-infested ponderosa pine to thinning. Arceuthobium Propagation; Ponderosa pine Diseases and pests; Ponderosa pine Thinning. 1000^" 900- Numbers are growth (cm) in 1970 1520 E c o (tj O) c o o o o 'â +3 TO 3 E o 800 700 600 500 400- 300- 200" 100. E c o to O) c o 4) i_ a> â o to o . i i i iâiâr 1945 47 49 51 53 55 57 59 61 63 65 67 69 71 731S Growth year Figure 3 â Average annual shoot growth and leader elonga- tion of 54 small, pole-size ponderosa pines. Dominants (14), codominants (14), and intermediates (26) are plotted sep- arately. Annual leader le
. Response of dwarf mistletoe-infested ponderosa pine to thinning. Arceuthobium Propagation; Ponderosa pine Diseases and pests; Ponderosa pine Thinning. 1000^" 900- Numbers are growth (cm) in 1970 1520 E c o (tj O) c o o o o 'â +3 TO 3 E o 800 700 600 500 400- 300- 200" 100. E c o to O) c o 4) i_ a> â o to o . i i i iâiâr 1945 47 49 51 53 55 57 59 61 63 65 67 69 71 731S Growth year Figure 3 â Average annual shoot growth and leader elonga- tion of 54 small, pole-size ponderosa pines. Dominants (14), codominants (14), and intermediates (26) are plotted sep- arately. Annual leader length is graphed on data points. Visually smoothed curves are used for the annual sums of branch segment lengths. Effect of Thinning on Crown Development and Ratio of Dwarf Mistletoe Plants to Crown Size Crown development accelerated immediately following stand release in 1957-58 (fig. 3). Length and number of branchlets among the dominant trees quadrupled in the first growing season after thinning. The increase was even larger in subse- quent seasons. During the 3 years following thinning, crowns of the intermedi- ates enlarged nine times the pretreatment rate. An extremely rapid rate of crown enlargement was maintained by trees of all crown classes up to study termina- tion in 1974. Height growth, notably, did not accelerate until 5 years after release (fig. 3). Trees retained in the growth study maintained an accelerated rate of crown enlargement through 1982 (Barrett and Roth 1985). 6. 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 Roth, Lewis F; Barrett, James W. (James Willis), 1922-. [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
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