.DELTA.13C Variations of Needles in Declining Japanese Cedar (Cryptomeria japonica).
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It has been reported that the δ<SUP>13</SUP>C of C<SUB>3</SUB> plants changes with various environmentalstresses. In order to obtain baseline data for the assessment of environmental stresses in declining Japanese cedar (Cryptomeria japonica) in the Kanto Plain, Japan, I comparedthe δ<SUP>13</SUP>C variations with the height of needle position in the crown between declining and healthy trees. The results showed higher δ<SUP>13</SUP>C ratio in needles (1-year-old) from the upper crown of declining trees than that of healthy trees. There was no significant difference in the nutrient levels of needles and in the SO<SUB>2</SUB> and 0<SUB>3</SUB> levels between the declining and healthy sites studied. Thus, nutrient levels and air pollution stress probably had little or no effect on the δ<SUP>13</SUP>C of needles. On the other hand, the atmo spheric water vapor saturation deficit was higher in declining areas, and Japanese cedar has the relatively low water stress tolerance. In addition, the vertical changes of δ<SUP>13</SUP>C in the crown were negatively correlated with those of twig volume (defined as an average volume of 1-year-old twigs at each position) probably caused by the reductionin leaf enlargement due to water stress. These results suggest that the δ<SUP>13</SUP>C of needles from the upper crown of declining trees is strongly affected by stomatal closure relatedto water stress.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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