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首页> 外文期刊>Environmental Science & Technology >Evaluation of Possible Causes for the Decline of Japanese Cedar (Cryptomeria japonica) Based on Elemental Composition and δ~(13)C of Needles
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Evaluation of Possible Causes for the Decline of Japanese Cedar (Cryptomeria japonica) Based on Elemental Composition and δ~(13)C of Needles

机译：基于针叶的元素组成和δ〜（13）C评估日本雪松衰落的可能原因

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摘要

The decline of Japanese cedar (Cryptomeria japonica) has been observed mainly in the groves of shrines, temples, and residences located in inland areas of the Kanto Plain, Japan, since the 1960s. I evaluated possible causes for the decline such as soil acidification and/or water stress based on the concentration of nutrient elements and Al and δ~(13)C of needles. Needles from declining trees did not exhibit the concentration of these elements that would be expected if the trees were affected by soil acidification. On the other hand, higher levels of δ~(13)C were observed in needles from sites with a high level of decline and especially in needles from the upper crown of declining trees. These results tend to support the hypothesis that the main cause of decline is due to water stress related to dry atmospheric conditions and possibly ambient ozone exposure. Also, the results suggests that the δ~(13)C of needles from the upper crown is useful as a sensitive indicator of the degree of water stress experienced by trees.
机译：自1960年代以来，日本雪松（Cryptomeria japonica）的下降主要在神社，寺庙和位于日本关东平原内陆地区的住宅树林中观察到。我根据营养元素的浓度以及针叶中的Al和δ〜（13）C来评估土壤酸化和/或水分胁迫等下降的可能原因。如果树木受到土壤酸化的影响，则树木倒下的针头不会表现出这些元素的浓度。另一方面，在下降程度较高的地方的针叶中，尤其是在下降的树木的上冠处的针叶中，观察到较高的δ〜（13）C水平。这些结果倾向于支持以下假设：下降的主要原因是与干旱的大气条件以及可能的环境臭氧暴露相关的水分胁迫。同样，结果表明，来自上冠的针的δ〜（13）C可用作树木经历的水分胁迫程度的敏感指标。

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  • 来源
    《Environmental Science & Technology》 |1996年第7期|p.2376-2381|共6页
  • 作者

    MASAHIRO SAKATA;

  • 作者单位

    Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwato-kita, Komae-shi, Tokyo 201, Japan;

  • 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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