Changes of the Distribution of Trace Elements in the Formation of Wound Heartwood.

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  • 傷害心材の形成による微量元素分布の変化
  • ショウガイ シンザイ ノ ケイセイ ニ ヨル ビリョウ ゲンソ ブンプ ノ ヘ

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Abstract

Stems of sugi (Cryptomeria japonica D. Don) and mizunara (Quercus mongolica var. grosseserrata) were bored with an increment borer to survey the changes in trace element content in the formation of wound heartwood. Discoloration of wood was occurred around the bore in each stem. The discolored area extended along the bore in longitudinal direction and reached more than 10 cm at the sapwood-heartwood boundary, but up to only 5 mm in tangential direction. The changes in content of 6 elements (Na, K, Mg, Ca, Mn and Cl) around the wound were determined by neutron activation analysis. The increase/decrease in the element contents occurred in discolored area in sapwood and were observed even in heartwood in mizunara. Most of the changes were similar to those observed around the sapwood-heartwood boundary of non-wounded stem but had some exceptions (Na in sugi and Mn in mizunara). Although the changes were slightly different from those in the normal heartwood formation, the results suggested the close relation between those trace elements and the heartwood formation.

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