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Browning the waters

机译:使水变褐

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摘要

Levels of dissolved organic carbon in British streams and lakes have risen over the past two decades. It might be a downstream effect of decreased acid rain - but isolating single factors is notoriously difficult. It may be small, but dissolved organic carbon (DOC) - operationally defined as organic compounds in water that can pass through a 0.45-|im filter - is of great interest. The export of DOC from land to aquatic ecosystems and the oceans is a significant mover of carbon through continents andlocal landscapes (Fig. 1, overleaf). In some ecosystems, loss of DOC can be as great as long-term accumulation of carbon in the form of dead organic material, for example as peat in peatlands. Then there is its role in the metabolism of lake ecosystems and the protection of aquatic organisms: DOC-rich waters are light brown, and so absorb ultraviolet radiation. On the other hand, DOC-rich water can produce carcinogens when chlorinated. Last - but for the bibulous not least - DOC content is even believed to help determine differences in the flavours of malt whiskies.
机译:在过去的二十年中,英国溪流和湖泊中的溶解有机碳含量有所上升。这可能是减少酸雨的下游影响-但众所周知,很难隔离单个因素。它可能很小,但是引起人们关注的是溶解有机碳(DOC),在操作上定义为可以通过0.45- | im过滤器的水中有机化合物。 DOC从陆地向水生生态系统和海洋的出口是碳在大陆和当地景观中的重要推动者(图1,下页)。在某些生态系统中,DOC的损失与死有机物形式的长期碳积累(例如泥炭地中的泥炭)一样大。然后它在湖泊生态系统的新陈代谢和水生生物的保护中发挥作用:富含DOC的水为浅棕色,因此吸收紫外线。另一方面,富含DOC的水在氯化时会产生致癌物。最后-但并非最不重要-甚至认为DOC含量有助于确定麦芽威士忌的口味差异。

著录项

  • 来源
    《Nature》 |2006年第7117期|p.283-284|共2页
  • 作者

    Nigel Roulet; Tim R. Moore;

  • 作者单位
  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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