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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Paradox of leaf phenology: Shorea robusta is a semi-evergreen species in tropical dry deciduous forests in India.
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Paradox of leaf phenology: Shorea robusta is a semi-evergreen species in tropical dry deciduous forests in India.

机译：叶片物候方面的悖论：浓香树（Shorearobusta）是印度热带干燥落叶林中的一种半常绿树种。

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摘要

Shorea robusta, widely distributed in moist and dry forests in the tropics, has been paradoxically described as deciduous, semi-deciduous or evergreen species. To assess this contradiction, quantitative documentation of leaf dynamics, flowering and fruiting (by monthly counts on tagged twigs) was made in marked individuals of Shorea in a tropical dry deciduous forest in Uttar Pradesh, India. Annual leaf exchange seems to be a survival strategy in Shorea during the period of seasonal drought; it replaces all old leaves of differing longevity with new leaves to reduce water loss due to transpiration, and simultaneously supports asynchronous flowering. During March (the transitional month for the leafing phenophase) four phenological variants, reflecting considerable functional diversity in conspecific trees, were recorded. These were: variant a, leaf fall completed and leaf flush begins; variant b, leaf fall and leaf flush overlapping; variant c, leaf fall completed but leaf flush delayed, short leaflessness; variant d, leaf fall incomplete (old leaves persist) and leaf flush delayed. Individuals of Shorea responded variously (leaf exchange or evergreenness to leaflessness or deciduousness, but <=1 year leaf lifespan) to microsite conditions, making it essentially a semi-evergreen species. It is suggested that semi-evergreenness in Shorea, an indicator of high adaptability, permits its extensive distribution in the tropics, from moist to the dry regions..
机译：浓郁的浓郁浓浓的浓浓浓浓的浓浓浓浓的浓浓浓郁的浓郁浓浓的浓浓浓郁的浓脂树，在热带湿润和干燥的森林中广泛分布，被自相矛盾地描述为落叶，半落叶或常绿树种。为了评估这一矛盾，在印度北方邦的热带干燥落叶林中，对浓脂树的显着个体进行了叶片动力学，开花和结果的定量记录（通过标记树枝上的每月计数）。在季节性干旱期间，每年的烟叶交换似乎是Shorea的生存策略。它用新叶子代替了所有长寿的老叶子，以减少因蒸腾作用而造成的水分流失，同时还支持异步开花。在三月（叶子生长期的过渡月份），记录了四个物候变种，反映了同种树中相当大的功能多样性。它们是：变型a，叶片落下完成并且叶片冲洗开始;方案b，叶片落落和叶片齐平重叠;变体c，叶片落下完成但叶片潮红延迟，无叶时间短;变体d，叶片落落不完全（老叶持续存在）并且叶片潮红延迟。浓脂树个体对微场所条件的反应多种多样（叶片交换或常绿对无叶或落叶，但叶片寿命<= 1年），因此基本上是半常绿树种。有人建议，肖拉的半常绿是高度适应性的指标，可以使它在热带从湿润到干燥地区广泛分布。

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