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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 6:53:34 PM
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UCREFRP
UCREFRP Catalog Number
9349
Author
Fischer, N. T., M. S. Toll, A. C. Cully and L. D. Potter.
Title
Vegetation Along Green and Yampa Rivers and Response to Fluctuating Water Levels, Dinosaur National Monument.
USFW Year
1983.
USFW - Doc Type
Albuquerque.
Copyright Material
NO
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~ r <br />27 <br />In addition to the sampling of the seven sites on the Yampa, six sites were <br />selected and sampled identically on the Green, four above the confluence and two <br />below (Table 1). The sites selected above the confluence represented the <br />spectrum of physiographic types sampled on the Yampa, while those below the <br />confluence represented only a sandy beach and a sand bar. In most cases, the <br />transects were extended beyond the historic floodline and into the upland zone <br />or the relictual riparian zone, using the same criteria as on the Yampa. At <br />Compromise Campground an impenetrable stand of tamarisk prevented sampling of <br />the entire historic flood zone. <br />Tamarisk Seedling Establishment <br />In September, five of the sample sites on the Yampa River were revisited, <br />Tepee Rapids, Biq Joe Rapids, Mather's Hole, Caddie Park and Box Elder. Each of <br />these sites exhibited successful tamarisk seedling establishment on sandy <br />substrates. The sand bar at Tepee was approximately 200 yards above the gravel <br />island sampled in August and that at Mather's Hole was about 50 yards downstream <br />of the August sampling area. The others were all within the August sampling <br />sites. <br />At three of the sites, Tepee, Caddie Park and Box Elder, the seedlings were <br />found in distinct linear zones across a seemingly uniform sandy substrate. At <br />Big Joe, they were more widespread over the flood zone, but there were patches <br />of bare sand present. At Mather's Hole, the sample site was an eroding sand <br />deposit with a dense, uniform covering of tamarisk seedlings. <br />A single transect was run at each of these sites. Transects ran from the <br />water's edge to the floodline and relief was measured as in August. Tamarisk <br />seedling density was measured at each meter on the transect line in four <br />
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