...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecosystems >Long-Term Trends in Stream Nitrate Concentrations and Losses Across Watersheds Undergoing Recovery from Acidification in the Czech Republic
【24h】

Long-Term Trends in Stream Nitrate Concentrations and Losses Across Watersheds Undergoing Recovery from Acidification in the Czech Republic

机译：捷克共和国从酸化中恢复过来的流域硝酸盐浓度和损失的长期趋势

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

Stream nitrogen (N) export and nitrate $(text {NO}^-_3) $ concentration were measured at 14 forested watersheds (GEOMON network) in the Czech Republic between 1994 and 2005. In the last several decades, emissions of sulfur (S) and N compounds have decreased throughout much of Europe. In the Czech Republic, atmospheric deposition of S has decreased substantially since the beginning of 1990s, whereas N deposition remains largely unchanged at most sites. The mean dissolved inorganic nitrogen (DIN) streamwater export ranged from 0.2 to 12.2 kg ha?1 y?1 at the GEOMON sites. Despite decades of elevated N deposition, 44–98% of DIN inputs to these watersheds were retained or denitrified, and many watersheds showed seasonal variation in nitrate concentrations. Dissolved organic N export was quantified in 1 year only and ranged from 0.05 to 3.5 kg ha?1 y?1. Spatial variability in DIN export among watersheds was best explained by spatial variability in average acidic deposition, particularly S deposition (R 2 = 0.81, P < 0.001); DIN input and forest floor carbon:nitrogen (C/N) also provided significant explanatory power. DIN export was strongly influenced by the forest floor C/N ratio and depth of the forest floor soils (R 2 = 0.72, P < 0.001). The only variable that predicted variations in forest floor C/N (R 2 = 0.32, P < 0.05) among watersheds was S deposition. Forest floor depth was also related to deposition variables, with S deposition providing the most explanatory power (R 2 = 0.50, P < 0.01). Variation in forest floor depth was also associated with climatic factors (precipitation and temperature). Temporal variability in DIN export was primarily associated with changes in acidic deposition over time; S deposition explained 41% of variability in DIN exports among all watersheds and years. Extensive acidification of forested watersheds was associated with the extraordinarily high S inputs to much of the Czech Republic during earlier decades. We hypothesize that recovery from acidification has led to improved tree health as well as enhanced microbial activity in the forest floor. As these watersheds move into a new regime with dramatically lower sulfur inputs, we expect continued declines in nitrate output.
机译：在1994年至2005年之间，对捷克共和国的14个森林小流域（GEOMON网络）进行了氮，氮浓度的测量。在过去的几十年中，硫（S ）和N化合物在整个欧洲大部分地区都在减少。在捷克共和国，自1990年代初以来，大气中S的沉积量已大大减少，而在大多数地点，N的沉积量基本上保持不变。 GEOMON站点的平均溶解无机氮（DIN）废水出口量为0.2至12.2 kg ha？1 y？1 。尽管数十年来氮沉降增加，但这些流域的DIN输入中仍有44–98％被保留或反硝化，许多流域的硝酸盐浓度表现出季节性变化。仅在1年内对溶解的有机氮出口进行了定量，其范围为0.05至3.5 kg ha？1 y？1 。流域间DIN出口的空间变异性最好用平均酸性沉积物，特别是S沉积物的空间变异性来解释（R 2 = 0.81，P <0.001）； DIN输入和林地碳：氮（C / N）也提供了重要的解释力。 DIN出口受到林底碳氮比和林底土壤深度的强烈影响（R 2 = 0.72，P <0.001）。流域中唯一能预测林地C / N变化的变量（R 2 = 0.32，P <0.05）是S沉积。森林地表深度也与沉积变量有关，S沉积提供最大的解释力（R 2 = 0.50，P <0.01）。森林地表深度的变化也与气候因素（降水和温度）有关。 DIN出口的时间变化主要与酸性沉积物随时间的变化有关。沉积物解释了所有流域和年份中DIN出口的41％的变化。森林流域的广泛酸化与早期几十年来捷克共和国大部分地区的超高硫输入有关。我们假设从酸化中恢复可以改善树木的健康状况，并增强森林地面的微生物活性。随着这些流域进入硫含量大大降低的新体制，我们预计硝酸盐产量将继续下降。

著录项

  • 来源
    《Ecosystems》 |2008年第3期|410-425|共16页
  • 作者

    Filip Oulehle; William H. McDowell; Jacqueline A. Aitkenhead-Peterson; Pavel Krám; Jakub Hru?ka; Tomá? Navrátil; Franti?ek Buzek; Daniela Fottová;

  • 作者单位

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

    Department of Natural Resources University of New Hampshire Durham New Hampshire 03824 USA;

    Department of Soil ampamp Crop Sciences Texas AampampM University College Station Texas 77843 USA;

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

    Department of Environmental Geochemistry and Biogeochemistry Czech Geological Survey Klárov 3 Prague 118 21 Czech Republic;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nitrate leaching; nutrient retention; nitrogen saturation; acidic deposition; soil C/N ratio; forest ecosystem; GEOMON watersheds;

    机译：硝酸盐浸出;养分保持;氮饱和;酸性沉积;土壤碳氮比;森林生态系统;GEOMON流域;

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