Identification And Assessment of Montana Reference Streams : a Follow-Up And Expansion of the 1992 Benchmark Biology Study 2005
Identification And Assessment of Montana Reference Streams : a Follow-Up And Expansion of the 1992 Benchmark Biology Study 2005
Suplee, Michael
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Studies show that logging roads produce by far the largest proportion of sediment among forest management practices (see literature review by Waters [1995]), and for this reason this screen was applied only to the cold water streams. The TIGER road density atlas does not map small, unimproved roads (i.e., logging roads) to the degree we expected (Boschen, personal communication). Due to the incompleteness of the TIGER road coverage, it was unclear if we could use previously published road-densi...ty 18 recommendations for forested areas (e.g., USDA 1995; USFWS 1998). We opted to build a road-density index for this screen, based on the BPJ assessments of the candidate cold-water reference sites. The TIGER road densities for cold water streams that received a on the BPJ assessment criterion "Road Densities" (Table 1.0) were placed in one group and those that received a 1 were placed in another. The mean road density in the group receiving was significantly higher than the mean for the other group (p = 0.03; T-test for means, unequal variance).
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