Abstract:
:The Universal Soil Loss Equation (USLE) and its derivatives are widely used for identifying watersheds with a high potential for degrading stream water quality. We compared sediment yields estimated from regional application of the USLE, the automated revised RUSLE2, and five sediment delivery ratio algorithms to measured annual average sediment delivery in 78 catchments of the Chesapeake Bay watershed. We did the same comparisons for another 23 catchments monitored by the USGS. Predictions exceeded observed sediment yields by more than 100% and were highly correlated with USLE erosion predictions (Pearson r range, 0.73-0.92; p < 0.001). RUSLE2-erosion estimates were highly correlated with USLE estimates (r = 0.87; p < 001), so the method of implementing the USLE model did not change the results. In ranked comparisons between observed and predicted sediment yields, the models failed to identify catchments with higher yields (r range, -0.28-0.00; p > 0.14). In a multiple regression analysis, soil erodibility, log (stream flow), basin shape (topographic relief ratio), the square-root transformed proportion of forest, and occurrence in the Appalachian Plateau province explained 55% of the observed variance in measured suspended sediment loads, but the model performed poorly (r(2) = 0.06) at predicting loads in the 23 USGS watersheds not used in fitting the model. The use of USLE or multiple regression models to predict sediment yields is not advisable despite their present widespread application. Integrated watershed models based on the USLE may also be unsuitable for making management decisions.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Boomer KB,Weller DE,Jordan TEdoi
10.2134/jeq2007.0094subject
Has Abstractpub_date
2008-01-04 00:00:00pages
79-89issue
1eissn
0047-2425issn
1537-2537pii
37/1/79journal_volume
37pub_type
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
pub_type: 杂志文章
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2004.1540
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abstract::Imidacloprid is a systemic insecticide effective in controlling the exotic pest (hemlock woolly adelgid) in eastern hemlock () trees. Concerns over imidacloprid impacts on nontarget species have limited its application in southern Appalachian ecosystems. We quantified the movement and adsorption of imidacloprid in fo...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2012.0504
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abstract::In a semiarid environment, climate is a critical factor in the decomposition of surface-applied biosolids. This study examined the effect of 2- to 7-yr exposure times on the composition of single applications of New York, NY biosolids in western Texas. Exposure time effects on organic matter, N, P, S, Cu, Cr, Pb, Hg, ...
journal_title:Journal of environmental quality
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doi:10.2134/jeq2003.1773
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journal_title:Journal of environmental quality
pub_type: 杂志文章,评审
doi:10.2134/jeq2003.3830
更新日期:2003-03-01 00:00:00
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0651
更新日期:2009-08-24 00:00:00
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.2180
更新日期:2003-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:2001-11-01 00:00:00
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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abstract::Metal contaminants in soils can persist for millennia, causing lasting negative impacts on local ecosystems. Long-term contaminant bioavailability is related to soil pH and to the strength and stability of solid-phase associations. We combined physical density separation with synchrotron-based microspectroscopy to red...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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