کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4427351 | 1309155 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Estimates of critical acid loads and exceedances for forest soils across the conterminous United States Estimates of critical acid loads and exceedances for forest soils across the conterminous United States](/preview/png/4427351.png)
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-km2 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 250 eq ha−1 yr−1, including much of New England and West Virginia. Very few areas of exceedance were predicted in the western US.
Journal: Environmental Pollution - Volume 149, Issue 3, October 2007, Pages 281–292