. Annual report 1953. Forests and forestry Southern States. On another similar watershed all woody vegetation was also cut to "begin with, but then the forest was allowed to grow back naturally. The first year after cutting, streamflow increases were comparable to those mentioned above, but this favorable yield diminished rapidly for the first 3 years, after which the decline was more gradual. The annual increase in yield for the 3-year-old coppice forest was inches; after 7 years re- growth inches; and at 12 years ^.9 inches. On still another watershed where only the laurel and
. Annual report 1953. Forests and forestry Southern States. On another similar watershed all woody vegetation was also cut to "begin with, but then the forest was allowed to grow back naturally. The first year after cutting, streamflow increases were comparable to those mentioned above, but this favorable yield diminished rapidly for the first 3 years, after which the decline was more gradual. The annual increase in yield for the 3-year-old coppice forest was inches; after 7 years re- growth inches; and at 12 years ^.9 inches. On still another watershed where only the laurel and rhododendron understory was cut from an old-growth hardwood stand, the average increase in water yield for the first 2 years was inches. The third year it was 2»k inches and for the kth year only 1 inch. During the 5 th year any increase over the precutting period was insignificant, probably not be- cause of regrowth of the understory, which was slow, but rather because of expansion of the roots of trees to use the available water. Cutting a strip along the water course also produced significant gains in streamflow during the summer months only. On one 20-acre water- shed where a narrow strip was cut along the stream (fig. 13), increases in. Figure 13.—An experimental watershed from which streambank vegetation was cut to see whether flow would be increased and if so how much and how long. " 31 ". 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 Southeastern Forest Experiment Station (Asheville, N. C. ). Asheville, N. C. : Southeastern Forest Experiment Station, U. S. Dept. of Agriculture, Forest Service
Size: 1868px × 1337px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, booksubjectforestsandforestrysouthernstates
