Ecological Research

, Volume 7, Issue 2, pp 199–202 | Cite as

Seasonal change in specific needle weight ofPinus thunbergii

  • Makoto Kimura
Short Communication


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.

Key words

Pinus thunbergii reserve dynamics specific needle weight 


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  1. Ericsson A. (1979) Effect of fertilization and irrigation on the seasonal change of carbohydrate reserves in different age-classes of needles on 20 year old Scots pine tree (Pinus silvestris).Physiol. Plant 45: 270–80.Google Scholar
  2. Fiala K. (1971) Seasonal changes in the growth of clones ofTypha latifolia L. in natural conditions.Polia Geobot. Phytotax. 6: 255–70.Google Scholar
  3. Fiala K. (1973) Growth and production of underground organs ofTypha angustifolia L.,Typha latifolia L. andPhragmites communis Trin.Pol. Arch. Hydrobiol. 20: 59–66.Google Scholar
  4. Iwaki H. &Midorikawa B. (1968) Principles for estimating root production in herbaceous perennials. In:Mothods of Productivity Studies in Root Systems and Rhizosphere Organisms (ed. USSR Academy of Science) pp. 72–8. Nauka, Leningrad.Google Scholar
  5. Kimura M. (1969) Ecological and physiological studies on the vegetation of Mt. Shimagare. VII. Analysis of production processes of youngAbies stand based on the carbohydrate economy.Bot. Mag. Tokyo 82: 6–19.Google Scholar
  6. Kimura M. (1978) Analysis of production processes of some evergreen plant populations based on the harvest method. In:Ecophysiology of Photosynthetic Productivity (eds M. Monsi & T. Saeki) pp. 212–22. University of Tokyo Press, Tokyo.Google Scholar
  7. Kimura M., Suzuki J., Tachibana M. &Tahara H. (1983) Role of evergreen foliage in the nitrogen economy during shoot growth ofTernstroemia gymnanthera, a warm-temperate broadleaf tree.Bot. Mag. Tokyo 96: 75–83.Google Scholar
  8. Koizumi H. (1985) Studies on the life history of an evergreen herb,Pyrola japonica, population on a forest floor in a warm temperate region. 1. Growth, net production and matter economy.Bot. Mag. Tokyo 98: 383–92.Google Scholar
  9. Kozlowski T. T. &Winget C. H. (1964) The role of reserves in leaves, branches, stems, and roots on shoot growth of red pine.Am. J. Bot. 51: 522–9.Google Scholar
  10. Loach K. &Little C. H. A. (1973) Production, storage and use of photosynthate during shoot elongation in balsam fir (Abies balsamea).Can. J. Bot. 51: 1161–8.Google Scholar
  11. Meyer M. M. Jr. &Splittstoesser W. E. (1971) The utilization of carbohydrate and nitrogen reserves byTaxus during its spring growth period.Physiol. Plant 24: 306–14.Google Scholar
  12. Mutoh N., Yoshida K. H., Yokoi Y. Kimura M. &Hogetsu K. (1968) Studies on the production processes and net production ofMiscanthus sacchariflorus community.Jpn. J. Bot. 20: 67–92.Google Scholar
  13. Rutter A. J. (1957) Studies in the growth of young plants ofPinus sylvestris L. I. The annual cycle of assimilation and growth.Ann. Bot. NS 11: 399–426.Google Scholar
  14. Yamamura Y. (1984) Matcer production processes ofReineckia carnea Kunth, an evergreen forest floor herb in the warm-temperate region of Japan.Bot. Mag. Tokyo 97: 179–91.Google Scholar
  15. Yamamura Y. (1986) Matter-economical roles of the evergreen foliage ofAucuba japonica, an understory shrub in the warm-temperate region of Japan. I. Leaf demography, productivity and dry matter economy.Bot. Mag. Tokyo 99: 323–32.Google Scholar
  16. Yokoi Y. &Kishida A. (1985) On the relationship between two indices (‘bulk density’ and ‘dry-matter content’) of dry-matter accumulation in plant organs.Bot. Mag. Tokyo 98: 335–45.Google Scholar

Copyright information

© Ecological Society of Japan 1992

Authors and Affiliations

  • Makoto Kimura
    • 1
  1. 1.Department of Biology, Faculty of ScienceTokyo Metropolitan UniversityHachiohji-shiJapan

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