Journal of Forest Research

, Volume 14, Issue 6, pp 358–364

Resource level as a proximate factor influencing fluctuations in male flower production in Cryptomeria japonica D. Don

Original Article

DOI: 10.1007/s10310-009-0148-2

Cite this article as:
Miyazaki, Y., Osawa, T. & Waguchi, Y. J For Res (2009) 14: 358. doi:10.1007/s10310-009-0148-2


Airborne pollen of Cryptomeria japonica causes severe pollinosis, and the number of people suffering from pollinosis has increased rapidly during recent decades. Male flower production in C. japonica shows annual variability; thus, predicting male flower production for the following spring could be a countermeasure against pollinosis. We analyzed factors that explain fluctuations in male flower production of C. japonica according to parameters reflecting internal resource dynamics based on field observations. In addition, we carried out experiments to regulate available resource levels using artificial shading to test the effect of internal resource levels on the number of male flowers produced. We found that temperature and precipitation in the previous summer and a relative increase in male flower production in the previous year were negatively related, whereas sunshine duration in the previous summer and diameter at breast height were positively related to the current year increase in male flower production. The number of male flowers was significantly reduced by the shading treatment and was positively correlated with the amount of total non-structural carbohydrates in the root. These results suggest that understanding the parameters controlling internal resource levels could lead to more accurate predictions of male flower production.


Artificial shadingMale flower productionMass floweringResource dynamicsTNC

Copyright information

© The Japanese Forest Society and Springer 2009

Authors and Affiliations

  • Yuko Miyazaki
    • 1
    • 3
  • Takeshi Osawa
    • 2
    • 4
  • Yoshiaki Waguchi
    • 1
  1. 1.Nara Forest Research InstituteTakatoriJapan
  2. 2.Graduate School of Human Development and EnvironmentKobe UniversityKobeJapan
  3. 3.Creative Research Initiative SouseiHokkaido UniversitySapporoJapan
  4. 4.Kanagawa Prefecture Natural Environment Conservation CenterAtsugiJapan