スギ雄花の開花前の大量落下;1994年生育期の異常な少雨高温の影響

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  • スギ雄花の開花前の大量落下; 1994 年生育期の異常な少雨高温の影響(林学)
  • スギ オバナ ノ カイカ マエ ノ タイリョウ ラッカ 1994ネン セイイク
  • Heavy fall of Sugi male strobili before anthesis due to abnormal hot and dry weather during the growth period in 1994 (FORESTRY)

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Great numbers of male flowers of Sugi, Cryptomeria japonica D. DON., were formed in 1994 due to abnormally hot and dry weather during the growth period, and a great multitude of pollen grains were released in March of the following year, 1995. We studied the yield of buds of male flowers before anthesis and that of open male flowers after anthesis, or pollen release, in 12 stands using litter traps during the period from July 1994 to July 1995. Great numbers of flower buds that had fallen in autumn and winter were recognized in an old stand about 600 years old and three mature stands about 95 years old, having no relationship to the number of open flowers in a stand. Most fallen flower buds were aborted, irrespective of the number fallen in a stand. Most flower buds that were part of the heavy fall had aborted pollen grains. In the old and three mature stands showing a high percentage of fallen flower buds, photosynthates invested in male organs including pollen attained 300-350g/m^2 (3-3.5t/ha). These results suggest that flower buds are thinned in order to save investment of photosynthates in male organs. The fall of male flower buds caused by abortion can be amplified by both the resource limitation mentioned above and water stress due to abnormal weather and a tree height of 35-50m above the ground.

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