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首页> 外文期刊>Environmental Science & Technology >Response off the Nitrogen Isotopic Composition of Tree-Rings Following Tree-Clearing and Land-Use Change
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Response off the Nitrogen Isotopic Composition of Tree-Rings Following Tree-Clearing and Land-Use Change

机译：树木清除和土地利用变化后对树木环氮同位素组成的响应

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摘要

Clear-cutting of forests affects the nitrogen cycle and the nitrogen isotopic composition of bioavailable ammonium and nitrate in the soil.Here,we have used nitrogen isotopic variations of tree-rings in red oak (Quercus rubra) and white oak (Quercus alba) as indicators of changes in the nitrogen cycle on a local scale.The delta~(15)N values of late-wood from trees at two remnant forest stands in Ontario,Canada,that underwent large-scale tree-clearing and permanent land-use change at different times were measured.Trees from the perimeter of each stand record a marked 1.5- 2.5 per thousand increase in the delta~(15)N values of their tree-rings relative to the values in trees from the center of the stand,with the shift synchronous with the tree-clearing and land-use change.This shift was most likely due to increased rates of nitrification and nitrate leaching in the soil as a result of tree-clearing combined with permanent changes in hydrology and probable fertilizer use accompanying the change in land-use.Nitrogen concentration in tree-rings was not affected by tree-clearing and the associated change in land-use.These results indicate that changes in nitrogen cycling in forest ecosystems,whether due to climate change,land-use change,or other environmental changes (increased O_3,other atmospheric pollutants,insects,etc.),can be faithfully monitored with nitrogen isotopic compositions of tree-rings and that dendro-geochemical analysis can be incorporated into studies of the effects of long-term anthropogenic effects on forest ecosystems.
机译：砍伐森林会影响土壤氮素循环以及土壤中可利用的铵态氮和硝态氮的氮同位素组成。在这里，我们使用了红橡（Quercus rubra）和白橡（Quercus alba）的树轮氮同位素变化作为在局部规模上氮循环变化的指标。加拿大安大略省两个残余森林林分的树木进行了大规模的砍伐和永久性的土地利用变化后，晚木的δ〜（15）N值相对于从林分中心到树木的值，每个林分周长的树木记录的树木年轮的δ〜（15）N值每千分之1.5-2.5明显增加。与树木砍伐和土地利用变化同步发生的变化。这种变化很可能是由于树木砍伐，土壤水文状况的永久变化以及土壤肥料可能伴随肥料的永久使用而导致土壤硝化和硝酸盐浸出速率增加的结果。树木砍伐中的氮浓度不受树木砍伐及其相关土地利用变化的影响。这些结果表明，森林生态系统中氮循环的变化，无论是由于气候变化，土地利用变化引起的或其他环境变化（增加的O_3，其他大气污染物，昆虫等），可以通过树木年轮的氮同位素组成忠实地进行监测，并且可以将树状地球化学分析纳入长期人为影响的研究中对森林生态系统的影响。

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  • 来源
    《Environmental Science & Technology》 |2005年第20期|p.7777-7783|共7页
  • 作者

    ANDREW R.BUKATA; T.KURTIS KYSER;

  • 作者单位

    Queen's Facility for Isotope Research,Department of Geological Sciences and Geological Engineering,Queen's University,Kingston,ON,Canada,K7N 3N6;

    Queen's Facility for Isotope Research,Department of Geological Sciences and Geological Engineering,Queen's University,Kingston,ON,Canada,K7N 3N6;

  • 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 环境化学;
  • 关键词

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