Are stored carbohydrates necessary for seed production in temperate deciduous trees?
Are stored carbohydrates necessary for seed production in temperate deciduous trees?
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DOI：
10.1111/1365-2745.12038
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发表时间：
2013-03-01
影响因子：
5.5
通讯作者：
Tayasu, Ichiro
中科院分区：
文献类型：
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作者：
Ichie, Tomoaki;Igarashi, Shuichi;Tayasu, Ichiro
1.许多树种每年的种子产量都有很大的波动，这种现象被称为桅杆。资源收支模型是解释主伐机制的一个关键假设，其假设是主伐年的大量播种取决于几年来储存的资源的丰度。但是，桅杆物种真的需要这样长期的储存来生产大量的种子作物吗？2.为了验证这一假设，我们研究了碳积累期的种子生产，估计放射性碳（C-14）分析，和每年的种子生产在温带落叶林冠层树种的变异系数之间的关系。这些物种的生殖间隔差异很大。在所研究的所有物种中，积累期在种子成熟前< 1.4年。此外，在不考虑物种或繁殖间隔的情况下，碳积累期与年种子产量波动之间没有显著的相关性，两者保持在一个平稳的水平上.合成.我们的研究结果表明，温带树冠树木使用的光合产物在当前和/或前一年的种子生产，无论生殖间隔。因此，可能有必要重新考虑储存碳水化合物资源对桅杆的重要性。
1. Many tree species undergo large fluctuations from year to year in seed production, a phenomenon known as masting. The resource budget model, based on the assumption that abundant seeding in a masting year depends on the abundance of resources stored over several years, is a key hypothesis in explaining the mechanism of masting. But do masting species really need such long-term storage to produce a large seed crop?2. To test this hypothesis, we studied the relationship between the carbon accumulation period for seed production, as estimated by radiocarbon (C-14) analyses, and the coefficient of variation of annual seed production in 10 canopy tree species in a temperate deciduous forest. These species differ widely in their reproductive intervals.3. In all the species studied, the accumulation period was < 1.4 years before seed maturation. Moreover, without taking species or reproductive intervals into account, there was no significant correlation between the carbon accumulation period and the fluctuation of annual seed production; both remained at an even level.4. Synthesis. Our results suggest that temperate canopy trees used photosynthates produced in the current and/or the previous year for seed production, regardless of reproductive intervals. It might therefore be necessary to reconsider the importance of stored carbohydrate resources for masting.