• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Limnologica >The most acidified Austrian lake in comparison to a neutralized mining lake
【24h】

The most acidified Austrian lake in comparison to a neutralized mining lake

机译：与中和的采矿湖相比，酸化程度最高的奥地利湖

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study investigated two mining lakes located in the north of Lower Austria. These lakes arose 45 years ago when open cast lignite mining ceased. The lakes are separated by a 7-m wide dam. Due to the oxidation of pyrite, both lakes have been acidified and exhibit iron, sulphate, and heavy metal concentrations several orders of magnitude higher than in circumneutral lakes. The water column of both lakes is divided into two layers by a pronounced chemocline. The smaller mining lake (AML), with pH close to of 2.6, is the most acidic lake in Austria, whereas flooding with stream water and by drainage from the surrounding fields neutralized the adjacent larger pit lake. The goal of our study was to investigate the effect of flooding on its physical, chemical and biological properties, in comparison to the pristine AML. Even relative to other extremely acidic lakes, the flora and fauna in the AML was reduced and composed of only two flagellate, one ciliate, and one rotifer species. The simplified pelagic food web in the mixolimnion consisted of heterotrophic bacteria, the mixotrophic flagellates Chlamydomonas acidophila and Ochromonas sp., the ciliate Oxytricha sp., and the rotifer Cephalodella sp. The latter two are as yet undescribed new species. The heliozoan Actinophrys sp. that may act as top predator occurred only in low abundance. The euglenid Lepocinclis buetschlii formed a stable deep chlorophyll maximum (DCM) at 7m depth. Highest cell numbers of L. buetschlii in the DCM exceeded 10~8L~(-1). The neutralized mining lake harboured higher plankton diversity similar to that of natural circumneutral lakes. A peak of at least 16 different phytoplankton taxa was observed during summer. The zooplankton consisted of several copepod species, daphnids and other cladocerans, and at least six different rotifer species. Several fish species occurred in the neutralized lake. Although the effect of non-permanent flooding was largely sustainable, interannual fluctuations of the pH affected the plankton community and reduced its species diversity.
机译：这项研究调查了位于下奥地利州北部的两个采矿湖。这些湖泊是45年前的露天褐煤开采停止时兴起的。湖泊被7米宽的大坝隔开。由于黄铁矿的氧化作用，两个湖泊都被酸化了，并表现出铁，硫酸盐和重金属的浓度比周围湖泊高出几个数量级。两个湖泊的水柱被明显的趋化线分为两层。 pH值接近2.6的较小的采矿湖（AML）是奥地利最酸性的湖泊，而溪流水和周围田野的排水淹没了相邻的较大的坑湖。与原始AML相比，我们研究的目的是调查洪水对其物理，化学和生物学特性的影响。即使相对于其他极端酸性的湖泊，AML中的动植物区系也减少了，仅由两个鞭毛，一个纤毛和一个轮虫组成。混合营养中的简化上层食物网由异养细菌，混合营养鞭毛嗜酸衣藻和Ochromonas sp。，纤毛Oxytricha sp。和轮虫Cephalodella sp组成。后两个是尚未描述的新物种。日生放线菌属。可能是顶级掠食者的发生仅发生在低丰度中。粗大的Lepocinclis buetschlii在7m深度处形成稳定的深叶绿素最大值（DCM）。 DCM中最高的布氏乳杆菌细胞数超过10〜8L〜（-1）。被中和的采矿湖所具有的浮游生物多样性与自然环境中的湖泊相似。在夏季，至少观察到了16种不同的浮游植物类群。浮游动物由几种co足类，水蚤和其他锁骨类以及至少六个不同的轮虫组成。中和后的湖中出现了几种鱼类。尽管非永久性洪水的影响在很大程度上是可持续的，但pH的年际波动影响了浮游生物群落并降低了其物种多样性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号