. Ponderosa pine saplings respond to control of spacing and understory vegetation. Ponderosa pine; Ponderosa pine Spacing. Cubic Volume Increment Both reduced tree density and the presence of understory vegetation lowered annual cubic wood production, , more wood per acre was produced at the higher densities where understory vegetation had been re- moved. But, at the higher densities, small spindly stems which may never reach merchantable size are included in the volume. The highest tree density where vegetation was removed produced 41 cubic feet per acre per year during the second period.
. Ponderosa pine saplings respond to control of spacing and understory vegetation. Ponderosa pine; Ponderosa pine Spacing. Cubic Volume Increment Both reduced tree density and the presence of understory vegetation lowered annual cubic wood production, , more wood per acre was produced at the higher densities where understory vegetation had been re- moved. But, at the higher densities, small spindly stems which may never reach merchantable size are included in the volume. The highest tree density where vegetation was removed produced 41 cubic feet per acre per year during the second period. Production decreased with increased spacing. The widest spacing produced only 8 cubic feet per acre per year during the second period where vegetation was left (fig. 8). At the end of the second 4-year period, the highest density where understory vegetation was left con- tained an average of about 448 cubic feet per acre compared with only 57 cubic feet at the lowest density (table 2). However, the average diameter of the high density stand was compared with feet at the low density (table 3). Where understory vegetation was removed, average diameter of the widely spaced stand was twice that of the closely spaced stand. A consistent increase in yearly wood pro- duction was observed from the first period to the second (fig. 8). This was most impressive at the three wider spacings where vegetation was removed. Production from the first 4-year period to the second was almost doubled at the and spacings and tripled at the widest spacing. 50 _ 1st period 2d period 1st period 2d period With understory vegetation Without understory vegetation. TREES PER ACRE AND SPACING (FEET) Figure annual cubic volume increment of ponderosa pine saplings during the first and second 4-year periods. 9. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectponderosapine
