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Title: Estimates of critical acid loads and exceedances for forest soils across the conterminous United States. Author: McNulty SG, Cohen EC, Moore Myers JA, Sullivan TJ, Li H. Journal: Environ Pollut; 2007 Oct; 149(3):281-92. PubMed ID: 17629382. Abstract: Concern regarding the impacts of continued nitrogen and sulfur deposition on ecosystem health has prompted the development of critical acid load assessments for forest soils. A critical acid load is a quantitative estimate of exposure to one or more pollutants at or above which harmful acidification-related effects on sensitive elements of the environment occur. A pollutant load in excess of a critical acid load is termed exceedance. This study combined a simple mass balance equation with national-scale databases to estimate critical acid load and exceedance for forest soils at a 1-km(2) spatial resolution across the conterminous US. This study estimated that about 15% of US forest soils are in exceedance of their critical acid load by more than 250eqha(-1)yr(-1), including much of New England and West Virginia. Very few areas of exceedance were predicted in the western US.[Abstract] [Full Text] [Related] [New Search]