| 南亚热带常绿阔叶林4个树种对增温的生理生态适应能力比较 |
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| 引用本文： | 李旭,吴婷,程严,谭钠丹,蒋芬,刘世忠,褚国伟,孟泽,刘菊秀.南亚热带常绿阔叶林4个树种对增温的生理生态适应能力比较[J].植物生态学报,2020,44(12):1203-1214. |
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| 作者姓名： | 李旭 吴婷 程严 谭钠丹 蒋芬 刘世忠 褚国伟 孟泽 刘菊秀 |
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| 作者单位： | 中国科学院华南植物园退化生态系统植被恢复与管理重点实验室, 广州 510650 |
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| 基金项目： | 国家自然科学基金(41977287);国家自然科学基金(41991285);广东省财政专项林业项目(环境变化对野生植物多样性影响的监测研究) |
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| 摘 要： | 以红枝蒲桃(Syzygium rehderianum)、海南红豆(Ormosia pinnata)、红锥(Castanopsis hystrix)和木荷(Schima superba) 4种南亚热带常绿阔叶林典型树种为研究对象, 采用红外-箱式增温的方法, 研究4个树种叶片气孔性状(表征气孔调节能力)、叶片解剖结构(表征叶片组织调节能力)和光合特征(表征养分维持能力)对增温的响应情况, 比较不同树种在增温背景下的生理生态适应能力, 为预测该地区森林植物在全球变暖情形下的生长变化趋势提供理论依据。结果表明: 增温后, 红枝蒲桃叶片海绵组织厚度减小, 且光合氮利用效率(PNUE)和光合磷利用效率(PPUE)降低; 海南红豆气孔导度增大、气孔密度减小以及叶片厚度和栅栏组织厚度减小, 同时光合速率、PNUE和PPUE升高; 红锥气孔大小缩小, 但光合速率不变; 木荷气孔增大而密度减小, 栅栏组织厚度减小, 光合速率、PNUE和PPUE降低。综上所述, 红枝蒲桃、海南红豆和木荷能够通过降低叶片厚度来适应高温环境, 不同物种的气孔调节、养分维持、光合速率和光合养分利用效率对增温的响应存在差异。增温有利于固氮植物海南红豆的生长, 但不利于传统优势树种木荷和红枝蒲桃的生长。因此, 在未来气候变暖的情况下, 固氮植物海南红豆由于具有较强的适应能力, 在南亚热带常绿阔叶林中可能会取代木荷和红枝蒲桃等成为新的优势树种。
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| 关 键 词： | 模拟增温 气孔大小 气孔密度 叶片解剖 光合作用 亚热带植物 |
| 收稿时间： | 2020-09-21 |
Ecophysiological adaptability of four tree species in the southern subtropical evergreen broad-leaved forest to warming |
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| LI Xu,WU Ting,CHENG Yan,TAN Na-Dan,JIANG Fen,LIU Shi-Zhong,CHU Guo-Wei,MENG Ze,LIU Ju-Xiu.Ecophysiological adaptability of four tree species in the southern subtropical evergreen broad-leaved forest to warming[J].Acta Phytoecologica Sinica,2020,44(12):1203-1214. |
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| Authors: | LI Xu WU Ting CHENG Yan TAN Na-Dan JIANG Fen LIU Shi-Zhong CHU Guo-Wei MENG Ze LIU Ju-Xiu |
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| Affiliation: | Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China |
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| Abstract: | Aims The subject of this study was to investigate warming effects on leaf stomatal traits, anatomical structure and photosynthetic traits of four common tree species in subtropical evergreen broad-leaved forest of southern China, and to compare their physiological adaptability to warming. Our study aims to provide a theoretical basis for better predicting the tree growth of native forests in a warming climate.Methods One-year-old seedlings of Syzygium rehderianum, Ormosia pinnata, Castanopsis hystrix and Schima superba were selected and exposed to two levels of temperature (ambient temperature and infrared heater warming). Leaf stomatal traits, anatomical structure and photosynthetic characteristics were measured to represent the abilities of stomatal regulation, leaf tissue regulation and nutrient maintenance, respectively.Important findings For Syzygium rehderianum, warming decreased its leaf sponge tissue thickness, photosynthetic nitrogen-use efficiency (PNUE) and photosynthetic phosphorous-use efficiency (PPUE). Seedling of O. pinnata exposed to warming showed increased stomatal conductance, photosynthetic rate, PNUE and PPUE, but decreased stomatal density, leaf thickness and palisade tissue thickness. For C. hystrix, warming decreased the stomata size, but did not affect its photosynthetic rate. Seedling of Schima superba exposed to warming showed lower stomata density, leaf palisade tissue thickness, photosynthetic rate, PNUE and PPUE, but higher stomata size. These results suggested that O. pinnata, Syzygium rehderianum and Schima superba could reduce their leaf thickness to acclimate to warming conditions. The abilities of stomatal regulation, nutrient maintenance, photosynthetic rate and PNUE varied among these tree species. Warming would be beneficial for the growth of O. pinnata due to increased photosynthetic rate, PNUE and PPUE, while not for Syzygium rehderianum and Schima superba, the two dominant tree species of native forests. This study indicated that, with projected climate change, O. pinnata may replace Syzygium rehderianum and Schima superba as a new dominant tree species in the subtropical evergreen broad-leaved forest for its stronger adaptability to warming. |
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| Keywords: | infrared heating stomatal size stomatal density leaf anatomical structure photosynthesis subtropical tree species |
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