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- W2023172223 endingPage "490" @default.
- W2023172223 startingPage "449" @default.
- W2023172223 abstract "Acidic precipitation can be characterized as wet or frozen atmospheric deposition with a hydrogen ion concentration greater than 2.5 μeq liter-1. Acidic precipitation is perceived as a significant air pollution problem derived chiefly from combustion of fossil fuels, smelting of sulfide metals, and other industrial processes. Precipitation data from the northeastern United States show a mean pH of between 4.0 and 4.2 with a range of from 3.0 to 6.0 among individual events. Although visible injury to plant foliage has been documented in a variety of studies only one case of visible foliar injury from the acidity in ambient rainfalls has been documented. Acidic precipitation can contribute nutrients to vegetation and could also influence nutrient leaching rates from vegetation. Although these processes occur, there are no data that show changes in nutrient levels in foliage that relate to crop or natural ecosystem productivity. Although no consistent patterns are presently known, acidic precipitation may affect host-plant pathogen interactions. Few experiments with field-grown crops or vegetation under natural conditions have been performed. Many of the studies are inadequate because they have been conducted with inadequate replication of treatments coupled with vigorous statistical analyses. Studies with field-grown crops are evaluated. Acidification of fresh waters of the northeastern United States is caused by acid deposition. Such regions in which this acidification occurs have in common, volume weighted mean H+ concentrations of 25μeq liter-1 or higher and slow weathering of granitic or Precambrian bedrock with thin soils deficient in minerals that provide buffering capacity. As freshwater acidification occurs, many plants, invertebrates, and vertebrates are progressively eliminated. Generally, fisheries are severely impacted when lake pH falls below 5.0. Fish are almost always eliminated when the lake pH is below 4.8." @default.
- W2023172223 created "2016-06-24" @default.
- W2023172223 creator A5046512622 @default.
- W2023172223 date "1984-10-01" @default.
- W2023172223 modified "2023-10-18" @default.
- W2023172223 title "Botanical aspects of Acidic precipitation" @default.
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