不同水热梯度下冠层优势树种叶片热力性状及适应策略的变化趋势
收稿日期: 2022-07-12
录用日期: 2022-10-10
网络出版日期: 2022-10-10
基金资助
国家自然科学基金(32171504);国家自然科学基金(31870386);云南省万人计划(YNWR-QNBJ-2019-191)
Variation of leaf thermal traits and plant adaptation strategies of canopy dominant tree species along temperature and precipitation gradients
Received date: 2022-07-12
Accepted date: 2022-10-10
Online published: 2022-10-10
Supported by
National Natural Science Foundation of China(32171504);National Natural Science Foundation of China(31870386);Ten Thousand Talents Plan of Yunnan(YNWR-QNBJ-2019-191)
叶片温度是植物能量交换和生理过程发生的重要微环境参数。叶片热力性状能够在一定程度上调控叶片温度, 避免极端温度对叶片的伤害。但目前针对叶片热力性状的研究还很少。该研究选择云南省从热带到温带具有明显水热梯度的4种典型植被类型: 干热河谷植被、热带雨林、亚热带常绿阔叶林、温带针阔混交林, 对其冠层优势树种的叶片热力性状进行了系统地研究。这些性状包括了可能影响叶片温度的形态、光学、材料特性、解剖和生理的23个性状。研究结果表明: 干热河谷植被的植物主要依靠蒸腾降温, 叶片薄, 叶寿命短, 主要为“快速投资-收益”型植物; 热带雨林植物叶片大, 蒸腾速率不高, 不利于降温, 较厚的叶片、较高的含水量能在一定程度上缓解高温, 采取“慢速投资-收益”策略; 亚热带常绿阔叶林很少发生极端温度, 叶片没有明显的热适应性状, 叶片厚, 叶寿命长, 采取“慢速投资-收益”策略; 温带针阔混交林植被的叶片小而厚, 多成簇状生长, 有一定保温作用。温带针阔混交林的冠层常绿植物光合速率较低, 偏“慢速投资-收益”型; 而落叶植物的光合速率较高, 偏“快速投资-收益”型。该研究系统地研究了热力性状与植物适应策略沿水热梯度的变化, 为深入认识植物对环境适应策略提供了理论基础。
周莹莹, 林华 . 不同水热梯度下冠层优势树种叶片热力性状及适应策略的变化趋势[J]. 植物生态学报, 2023 , 47(5) : 733 -744 . DOI: 10.17521/cjpe.2022.0289
Aims Leaf temperature is one of the important microenvironmental parameters for energy exchange and physiological processes of plants. Leaf thermal traits can regulate leaf temperature so as to relieve heat damage to some extent. However, systematic studies on leaf thermal traits are rare.
Methods In the present study, 43 dominant canopy species of four typical vegetation types with varying temperature and precipitation from tropical to temperate zones in Yunnan Province were selected: savanna vegetation, tropical rain forest, subtropical evergreen broadleaf forest, and temperate mixed forest. We selected 23 thermal traits that might have influence on leaf temperature, including leaf morphological, optical, material property, anatomical and physiological traits.
Important findings The results showed that plants in savanna vegetation mainly relied on transpiration for cooling. Savanna species have thin leaves and short life span. They are mainly “quick investment-return” species. Tropical rain forest plants developed large leaves, with low transpiration rates, which have no advantage of leaf cooling. Thick leaves and high water content can alleviate high temperature to some extent. They adopted “slow investment-return” strategy. Subtropical evergreen broadleaf forest was rarely exposed to extreme temperatures. The species had thick leaves, long leaf life span, and adopted “slow investment-return” strategy. They did not show obvious thermal adaptation traits. Temperate mixed forest had small and thick leaves, growing in clusters which provides benefits for thermal insulation. Photosynthetic rate of canopy evergreen plants in this forest was low, adopting “slow investment-return” strategy, while photosynthetic rate of deciduous plants was high, presenting “quick investment-return” characteristics. This study systematically investigated the variation of leaf thermal traits and plant adaptation strategies along temperature and precipitation gradients, providing a theoretical basis for further understanding of plant adaptation to the environment.
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