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首页> 外文期刊>Environmental Science & Technology >Declining Acidic Deposition Begins Reversal of Forest-Soil Acidification in the Northeastern U.S. and Eastern Canada
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Declining Acidic Deposition Begins Reversal of Forest-Soil Acidification in the Northeastern U.S. and Eastern Canada

机译：酸性沉积物的减少开始扭转美国东北部和加拿大东部森林土壤的酸化

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摘要

Decreasing trends in acidic deposition levels over the past several decades have led to partial chemical recovery of surface waters. However, depletion of soil Ca from acidic deposition has slowed surface water recovery and led to the impairment of both aquatic and terrestrial ecosystems. Nevertheless, documentation of acidic deposition effects on soils has been limited, and little Is known regarding soil responses to ongoing acidic deposition decreases. In this study, resampling of soils in eastern Canada and the northeastern U.S. was done at 27 sites exposed to reductions in wet SO_4~(2-) deposition of 5.7-76%, over intervals of 8-24 y. Decreases of exchangeable Al in the O horizon and Increases in pH in the O and B horizons were seen at most sites. Among all sites, reductions in SO_4~(2-) deposition were positively correlated with ratios (final sampling/initial sampling) of base saturation (P ＜ 0.01) and negatively correlated with exchangeable Al ratios (P ＜ 0.05) in the O horizon. However, base saturation in the B horizon decreased at one-third of the sites, with no increases. These results are unique in showing that the effects of acidic deposition on North American soils have begun to reverse.
机译：在过去的几十年中，酸性沉积物水平的下降趋势导致了地表水的部分化学回收。但是，酸性沉积对土壤钙的消耗减慢了地表水的回收，并导致了水生和陆地生态系统的损害。然而，酸性沉积物对土壤的影响的文献有限，关于土壤对正在进行的酸性沉积物的反应减少的知之甚少。在这项研究中，在加拿大东部和美国东北部的27个土壤进行了重新采样，这些土壤暴露了8-24年的SO_4〜（2-）湿沉降量减少5.7-76％，这两个地点均受到了影响。在大多数地点发现O层中可交换的Al减少，而O和B层中的pH升高。在所有站点中，SO_4〜（2-）沉积的减少与O层中碱饱和度的比率（最终取样/初始取样）呈正相关（P ＜0.01），与可交换的Al比率呈负相关（P ＜0.05）。但是，B层中B层的碱基饱和度下降了三分之一，没有增加。这些结果是独特的，表明酸性沉积对北美土壤的影响已开始逆转。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13103-13111|共9页
  • 作者

    Gregory B. Lawrence; Paul W. Hazlett; Ivan J. Fernandez; Rock Ouimet; Scott W. Bailey; Walter C. Shortle; Kevin T. Smith; Michael R. Antidormi;

  • 作者单位

    New York Water Science Center, U.S. Geological Survey, 425 Jordan Road, Troy, New York 12180, United States;

    Natural Resources Canada-Canadian Forest Service, 1219 Queen Street E., Sault Ste. Marie, Ontario P6A 2ES, Canada;

    University of Maine, School of Forest Resources, Deering Hall, Orono, Maine 04469-5722, United States;

    Direction de la recherche forestiere, ministere des Foret, de la Faune et des Parcs du Quebec, Complexe scientifique, 2700 Einstein Street, Quebec City, Quebec G1P 3W8, Canada;

    Northern Research Station, Hubbard Brook Experimental Forest, USDA Forest Service, 234 Mirror Lake Road, North Woodstock, New Hampshire 03262, United States;

    Northern Research Station, USDA Forest Service, 271 Mast Road, Durham, New Hampshire 03824, United States;

    Northern Research Station, USDA Forest Service, 271 Mast Road, Durham, New Hampshire 03824, United States;

    New York Water Science Center, U.S. Geological Survey, 425 Jordan Road, Troy, New York 12180, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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