• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Effects of Acid Mine Drainage and Acid Precipitation on Leaf Litter Breakdown Rates in Appalachian Headwater Streams.
【24h】

Effects of Acid Mine Drainage and Acid Precipitation on Leaf Litter Breakdown Rates in Appalachian Headwater Streams.

机译：酸性矿山排水和酸性沉淀对阿巴拉契亚源水流中凋落物分解率的影响。

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

Acid precipitation and acid mine drainage have dramatically altered chemical conditions and biological assemblages in streams throughout the central Appalachians. Effects of acidification on functional stream processes such as organic matter decomposition, however, remain poorly understood. The objectives of this study were to: (1) quantify differences in organic matter decomposition among reference streams, streams impacted by acid precipitation, and streams impacted by acid mine drainage; and (2) determine if lowered decomposition rates are the result of reduced microbial activity or altered invertebrate shredder assemblages or both. I quantified water chemistry, organic matter decomposition, microbial activity, and macroinvertebrate community structure in 15 headwater streams in the central Appalachian ecoregion (5 circumneutral reference, 5 acid mine drainage, and 5 acid precipitation). Decomposition rates were quantified from leaf packs deployed for a period of 120 days over three seasons. Water chemistry was sampled in conjunction with decomposition trials. Benthic invertebrate communities were sampled in spring and fall. Microbial activity was measured as total microbial community respiration and ergosterol content. Acid mine drainage resulted in dramatically reduced shredder assemblages, reduced microbial activity and reduced overall organic matter decomposition. Acid precipitation resulted in altered shredder assemblages, reduced microbial respiration and diminished organic matter decomposition, but not as severely as seen in acid mine drainage streams. Overall, decomposition rates were more strongly correlated with microbial respiration and ergosterol concentration than shredder community composition. However, shifts in shredder assemblages, including the loss of acid sensitive voracious shredders, such as Lepidosotoma, Limnephilidae, Petronarcys, Gammarus, and Decopoda, also is likely responsible for the reduction in organic matter processing ability in acid impacted streams. Our results provide further evidence that restoration of acidic headwater Appalachian streams is needed in order to effectively manage conditions in larger aquatic ecosystems downstream.
机译：酸沉淀和酸性矿山排水大大改变了整个阿巴拉契亚中部河流的化学条件和生物组成。然而，酸化对功能性物流过程（如有机物分解）的影响仍然知之甚少。这项研究的目的是：（1）量化参考流，受酸沉淀影响的流和受酸矿排泄影响的流之间有机物分解的差异； （2）确定降低的分解速率是微生物活性降低或无脊椎动物切碎机组合改变还是两者的结果。我对阿巴拉契亚中部生态区的15个源头水流中的水化学，有机物分解，微生物活性和大型无脊椎动物群落结构进行了定量（5个周围环境参考，5个酸性矿山排水和5个酸性降水）。从三个季节中部署了120天的叶包中量化分解速率。结合分解试验对水化学进行了采样。在春季和秋季对底栖无脊椎动物群落进行了采样。以总微生物群落呼吸和麦角固醇含量来测量微生物活性。酸性矿山的排水导致破碎机组件的显着减少，微生物活性的降低以及有机物整体分解的降低。酸沉淀导致切碎机组合发生变化，微生物呼吸减少，有机物分解减少，但不像酸性矿山排水流那样严重。总体而言，分解率与微生物呼吸作用和麦角固醇浓度的关系要比切碎机群落组成更紧密。但是，切碎机组合的变化，包括对酸敏感的易碎切碎机（如鳞翅目，Limnephilidae，Petronarcys，Gammarus和Decopoda）的丢失，也可能导致受酸影响的流中有机物处理能力的下降。我们的结果提供了进一步的证据，即为了有效管理下游大型水生生态系统的状况，需要恢复酸性源头阿巴拉契亚河流。

著录项

  • 作者

    Stewart, Mary Fiona.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Biology Limnology.;Water Resource Management.;Biology Ecology.
  • 学位 M.S.
  • 年度 2010
  • 页码 96 p.
  • 总页数 96
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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