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Phosphorus sorption by sediments in eutrophic and acidic lakes.

机译：富营养和酸性湖泊中沉积物对磷的吸收。

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摘要

Phosphorus (P) binding by aluminum (Al), iron (Fe), and calcium (Ca) in lake sediments was studied in both nutrient-rich (eutrophic) circumneutral lakes and nutrient-poor (oligotrophic) acidic lakes. Aluminum sulfate (alum), used to control internal P loading from the sediment, was applied to several eutrophic lakes in the Minneapolis, MN area. Methods used to determine alum dose were compared and the results of alum treatments applied to the Minneapolis Chain of Lakes were examined. P concentrations improved (decreased) initially in all lakes treated, and three lakes were still experiencing continued benefits at the end of this study. Analysis of the sediment, however, showed that internal P load reductions met the restoration goals in all lakes, which suggests that the importance of external P loading on water quality was underestimated in the lake with short-term treatment benefits.; Binding of P by Al in acidified lakes resulted in the inactivation of a substantial amount of P over nearly five decades in lakes across southern Sweden. In addition, total sulfur (ST) in the lake sediment also increased during the industrial acidification stage (IAS; determined by 210lead dating) in two lakes (Lakes Gardsjon and Gyltigesjon). Based on this evidence and that from other studies, ST levels in sediment cores from 12 lakes were related to elevated levels of Al and Al bound P (Al-P) during the IAS and to increasing sulfate in the deposition over Sweden during the period ∼1930--1970. Of the 12 lakes, four showed increased sediment Al and Al-P during the IAS, three showed increases before the IAS, three showed increases during both periods and two lakes showed increases that could not be related to the IAS. It is hypothesized that forest harvesting, which was at its peak in Sweden in the mid to late 1800s, caused the pre-IAS increases in sediment Al and Al-P, and that liming caused the non-IAS related increases in Al and Al-P through precipitation of Al at time of treatment. In conjunction with Al, Fe and Ca were also generally available for P sorption after treatment with lime, potentially exacerbating P limitation in these lakes.
机译：在富营养（富营养）的中性湖泊和贫营养（贫营养）的酸性湖泊中都研究了湖泊沉积物中铝（Al），铁（Fe）和钙（Ca）与磷（P）的结合。硫酸铝（铝）用于控制沉积物中的内部磷含量，已应用于明尼苏达州明尼阿波利斯的几个富营养化湖泊。比较了确定明矾剂量的方法，并检查了明尼阿波利斯湖链实施明矾处理的结果。在所有处理过的湖泊中，磷浓度最初都得到改善（降低），并且在本研究结束时，三个湖泊仍在持续受益。然而，对沉积物的分析表明，内部磷的减少量满足了所有湖泊的恢复目标，这表明在短期内，对湖泊中外部磷的负荷对水质的重要性被低估了。在酸化的湖泊中，铝与磷的结合导致瑞典南部湖泊中近五十年的大量磷失活。此外，在两个湖泊（加德斯洪湖和吉尔吉斯松湖）的工业酸化阶段（IAS；由210铅定年法确定）期间，湖泊沉积物中的总硫（ST）也增加了。基于这一证据和其他研究，IAS期间12个湖泊的沉积物岩心中的ST水平与Al和与Al结合的P（Al-P）的水平升高有关，并且与瑞典在整个沉积过程中的硫酸盐含量增加有关。 1930--1970年。在这12个湖中，有4个湖显示在IAS期间增加了Al和Al-P的沉积物，有3个湖在IAS之前显示了增加，在两个时期中有3个显示了增加，并且有2个湖显示了与IAS无关的增加。据推测，森林采伐在1800年代中期至后期在瑞典达到顶峰，导致IAS之前的沉积物Al和Al-P增加，而石灰化导致非IAS相关的Al和Al-P增加。通过处理时的铝沉淀生成P。与石灰一起处理后，铁和钙通常还与铝，铁和钙一起用于磷的吸附，这可能加剧这些湖泊中磷的限制。

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  • 作者

    Huser, Brian Joel.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Biology Limnology.; Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;
  • 关键词

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