| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
I examined whether the flowering of Fraxinus platypoda a dioecious tree, is synchronized between male and female trees, and whether this flowering and seed production patterns are changed for about 30 years. I found clear annual fluctuations in flowering in three populations over the 30 years. Mast and lean years occurred synchronously at 3 years interval in three populations until 1998. During this period, synchronous flowering clearly occurred between females and males in each population. Flowering patterns in three populations changed after 1999, with male trees undergoing stably much flowering, females displaying a shorter flowering cycle, and less synchrony between sexes. No flowering occurred in male trees in three populations after 1998 and flowering degree of female increased. As the tree age is different among three populations, the cause of these changes after 1998 may not result from maturity in life history, but climate change such as increase of temperature.
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