炭素安定同位体比と葉内窒素含有量による樹木の生理診断

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  • Carbon isotope ratio and the nitrogen content of leaves: A possible indicator of limiting factor for tree growth
  • タンソ アンテイ ドウイタイヒ ト ヨウナイ チッソ ガンユウリョウ ニヨル

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Water and nitrogen are usually considered to be the limiting factors for growth of trees on urban streets. We demonstrated that the leaf carbon isotope ratio (δ13C) is a good indicator of long-term water stress of various species (Zelkowa serrata, Platanus occidentalis, Cinnamomun camphora, Sophora japonica, Ginkgo biloba), resulting from low intercellular carbon dioxide concentrations in water stress treatments in green house experiments. It is well known that the leaf carbon isotope ratio is negatively correlated with intercellular carbon dioxide concentrations in various kinds of plants. On the other hand, leaf nitrogen content is thought to be an indicator of nitrogen supply for street trees, because leaf nitrogen content increases as soil nutrients become enriched. The simultanuous measurements of δ13C and nitrogen content of leaves by automatic stable isotope analyzer suggested that the growth of street trees was limited by soil nitrogen, rather than soil water, during June to September, 1994, in Toyota city.

収録刊行物

  • 地球化学

    地球化学 29 (2), 127-136, 1995

    一般社団法人日本地球化学会

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