Intraspecific Variation in Leaf Life Span for the Semi-evergreen Liana Akebia trifoliata is Caused by Both Seasonal and Aseasonal Factors in a Temperate Forest
Intraspecific Variation in Leaf Life Span for the Semi-evergreen Liana Akebia trifoliata is Caused by Both Seasonal and Aseasonal Factors in a Temperate Forest
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温带森林中半常绿木通叶寿命的种内变异是由季节性和非季节性因素引起的
DOI：
10.5141/jefb.2008.31.3.207
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发表时间：
2008
影响因子：
--
通讯作者：
K. Kikuzawa
中科院分区：
文献类型：
--
作者：
Koyama Kohei;K. Kikuzawa
我们调查了日本温带森林中温带木本藤本植物三叶阿克木的叶片人口统计学。阿克木是半常绿植物，一些叶子在冬季前脱落，而其他叶子在冬季保留。以往对半常绿物种的研究发现，叶片寿命的变化是由叶片出芽时间的变化引起的，在冬季前出现的叶片越冬，而较早出现的叶片脱落，但同一种群的叶片（即在同一地点同时出现的叶片）是否在强烈的季节性影响下表现出寿命的变化尚不清楚。为了将每个队列中叶片寿命的变化与队列之间的变化分开，我们提出了一种新的方法-单叶图，它显示了每个叶片的出现和死亡。利用单叶图，我们的研究表明，在一个队列中，阿克比亚的叶子在寿命上表现出很大的变化，有些叶子会越冬，有些则不会。此外，林下小分株的叶片寿命差异较大，而大分株的叶片寿命较短，在林冠位置较高，因此小分株为半常绿植物，而大分株为落叶植物。小分株的叶片寿命较长可以解释为林下植物的树荫适应策略。
We investigated the leaf demography of a temperate woody liana, Akebia trifoliata, in a temperate forest in Japan, Akebia is semi-evergreen: some leaves are shed before winter, while others remain through the winter. Previous studies of semi-evergreen species found that variation in leaf life span was caused by variation in the timing of leaf emergence, Leaves that appeared just before winter over-wintered, while leaves appearing earlier were shed, However, it is unclear whether leaves of the same cohort (i.e., leaves that appear at the same time within a single site) show variation in life span under the effect of strong seasonality. To separate variation in life span among the leaves in each cohort from variation among cohorts, we propose a new method - the single leaf diagram, which shows the emergence and death of each leaf. Using single leaf diagrams, our study revealed that Akebia leaves within a cohort showed substantial variation in life span, with some over-wintering and some not. In addition, leaves on small ramets in the understory showed great variation in life span, while leaves on large ramets, which typically reach higher positions in the forest canopy, have shorter lives, As a result, small ramets were semi-evergreen, whereas large ramets were deciduous, The longer lives of leaves on small ramets can be interpreted as a shade-adaptive strategy in understory plants.
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DOI：
--
发表时间：
2008
期刊：
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影响因子：
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DOI：
--
发表时间：
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期刊：
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影响因子：
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作者：
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