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North Platte - Pine Beetle_ USFS Application
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North Platte - Pine Beetle_ USFS Application
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Last modified
4/15/2013 4:13:32 PM
Creation date
9/16/2008 3:09:25 PM
Metadata
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Template:
WSRA Grant and Loan Information
Basin Roundtable
North Platte
Additional Roundtables
Colorado
Applicant
US Department of Agricultural, US Forest Service, Rocky Mountain Research Station
Description
Effects of Mountain Pine Beetle
Account Source
Basin & Statewide
Board Meeting Date
11/18/2008
Contract/PO #
C150440
WSRA - Doc Type
Grant Application
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Water Supply Reserve Account -Grant Application Form <br />Form Revised May 2007 <br />7. Please provide a brief narrative of any related or relevant previous studies. <br />Little is known about the effects of insect outbreaks on water yield. This lack of information <br />should alarm water users and land managers who share concerns about peak discharge, <br />streamflow amount and water quality. The 1940s spruce beetle outbreak in the White River <br />National Forest provides some local insight about how northern Colorado basins may <br />respond to current beetle outbreaks. The flow from both the White and Yampa Rivers <br />increased during the decades after beetles killed 30 to 80% of the overstory across much of <br />the forested portions of these basins (Love 1955). However, because of extreme year to <br />year variability in snowfall, the influence of canopy mortality on streamflow was uncertain <br />during the first decade after the outbreak (Bethlahmy 1973). The greatest change in <br />streamflow occurred 15 years after the outbreak (25% increase), and flows remained 10% <br />higher than the pre-outbreak record for an additional decade (Love 1955; Bethlahmy 1973). <br />In Montana lodgepole pine forests, the timing of peak runoff was advanced by two weeks <br />after 35% canopy mortality from bark beetles (Potts 1984). Reduced nutrient uptake and <br />increased soil temperature and moisture in beetle gaps created conditions that favored <br />nitrate leaching from Wyoming lodgepole (Parsons et al. 1986) and other conifer forest types <br />(Huber 2005). These studies suggest that the hydrologic responses after beetle outbreak <br />may be comparable to the effects of logging in Rocky Mountain pine forests (Troendle and <br />King 1985; Reuss et al. 1997), yet large uncertainties about local watershed responses and <br />the consequences of post-beetle salvage activities remain. <br />10
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