Seasonal change in specific needle weight ofPinus thunbergii |
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Authors: | Makoto Kimura |
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Institution: | (1) Department of Biology, Faculty of Science, Tokyo Metropolitan University, 192-03 Hachiohji-shi, Japan |
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Abstract: | To evaluate the reserve dynamics in pine needles, an index of specific needle weight (SNW; dry weight per unit length of needles)
was provided. Developed needles ofPinus thunbergii did not show any additional elongation in their second year. Thus the seasonal change in SNW of developed needles was proved
to indicate the dynamics of reserves in needles. SNW showed distinct seasonal change. It increased from autumn to carly spring,
followed by a decrease by mid summer. This pattern of change was similar to the change in specific leaf weight (SLW) of evergreen
broad leaves in temperate regions. It was concluded that the change in SNW indicated clearly the dynamics of reserves in needles,
showing the accumulation in non-growth seasons and the consumption in subsequent growth seasons. The decrease in SNW during
the growth season was 10–15% of the maximum found in early spring. |
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Keywords: | Pinus thunbergii reserve dynamics specific needle weight |
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