Wildlife species: responses to forest harvesting and management in riparian stands and landscapes
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Wildlife species: responses to forest harvesting and management in riparian stands and landscapes
Published Date
2001
Publisher
University of Minnesota Duluth
Type
Technical Report
Abstract
Breeding birds were surveyed in five watersheds in northern Minnesota for four years. In
three watersheds (Knife, Pokegama, Cloquet) 12, 6 to I 0 acre plots were established. In
two watersheds (Knife, Gooseberry) one large(> 40 acre) plot was established.
Plots were established to assess breeding bird response to harvest type and J:iarvest
method in riparian forests.
Treatments in the Pokegama watershed included removal of basal area to 25-35 ft within
100 ft of either side of the stream with two different harvest methods (grapple skidding
and cut-to-length systems). Uplands adjacent to riparian buffers were clearcut and three
total (no harvest) plots were maintained in the watershed as well as three uncut riparian
control plots. Before harvest data were collected in 1997, harvest was completed in the
fall of 1997, and after harvest data collected in 1998, 1999 and 2000.
Treatments in the Knife watershed ranged from clearcut in the riparian area to 25-35 ft
residual basal area within 100 feet on one side of the stream. Uplands adjacent to
riparian buffers were clearcut and three total (no harvest) plots were maintained in the
watershed as well as three uncut riparian control plots. Harvests were not completed on
all sites because of poor winter harvest conditions in 1997, 1998 and 1999. Breeding bird
data have been collected in all years and will be collected in 200 I if all sites are harvested
within this time frame.
Treatments on sites in the Cloquet watershed were designed to examine bird response to
harvest in the riparian area by leaving residual basal area ( 40 ft2) in either a scattered or
clumped pattern. Uplands adjacent to riparian buffers were clearcut and three total (no
harvest) plots were maintained in the watershed as well as three uncut riparian control
plots. Harvests were not completed on all sites because of poor winter harvest conditions
in 1997, 1998 and 1999. Breeding bird data have been collected in all years and will be
collected in 2001 if all sites are harvested within this time frame.
Bird surveys were also completed on two large sites in Lake County. One site, the
Gooseberry was harvested, but the Knife River site was not. No statistical analyses were
completed on these data and no additional studies are planned.
In addition to breeding bird surveys, two additional tasks were completed and results
were presented in the previous biennial report (Louisiana Waterthrush and riparian
landscape statistics for the forested regions of Minnesota. No new information is presented in this report on those tasks.
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Hanowski, JoAnn M; Danz, Nicholas P; Lind, Jim; Niemi, Gerald J; Wolter, Peter T.. (2001). Wildlife species: responses to forest harvesting and management in riparian stands and landscapes. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/187272.
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