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| 深山含笑等18个景观树种光合生理特性研究 |
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盘李军,冼杆标,陈伟光,苏木荣,张卫强,潘文,陈建新
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广东省佛山市云勇生态林养护中心 广东佛山,广东省佛山市云勇生态林养护中心 广东佛山,广东省佛山市云勇生态林养护中心 广东佛山,广东省佛山市云勇生态林养护中心 广东佛山,广东省林业科学研究院 广州,广东省林业科学研究院 广州,广东省林业科学研究院 广州
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| 摘要: |
| 以深山含笑(Michelia maudiae)等18个景观树种为研究材料，采用Li-6400光合作用测定系统测定光合、蒸腾、水分利用效率等生理参数及其光响应过程，探讨景观树种在自然生境下的光合生理特征。结果表明：18个景观树种光响应曲线符合非直角双曲线模型（R2＞0.99），最大净光合速率为8.15~22.02 μmol?m-2?s-1，表观量子效率为0.045~0.234，光饱和点为878.7~1 949.3 μmol?m-2?s-1，光补偿点为1.3~18.7 μmol?m-2?s-1，18个景观树种光适应性介于典型阴生植物和阳生植物之间。红花羊蹄甲(Bauhinia blakeana)、红花荷(Rhodoleia championii)、木棉(Bombax ceiba)、紫薇(Lagerstroemia indica)和穗花棋盘脚(Barringtonia racemosa)具有较高的净光合速率和水分利用效率。水分利用效率以火焰木最大，大花紫薇最小，与蒸腾速率恰好相反，而净光合速率并未表现出一致性，表明该地区景观树种的水分利用效率受蒸腾速率的影响可能更大 |
| 关键词: 净光合速率 蒸腾速率 水分利用效率 主要景观树种 华南 |
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| 基金项目:广东省林业科技创新专项项目(2010KJCX013-02) |
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| Study on Photosynthetic Physiological Characteristics of 18 Kinds of Landscape Trees Including Michelia maudiae |
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PAN Lijun,; XIAN Gan biao,; CHEN Weiguang,; SU Murong,; ZHANG Weiqiang,; PAN Wen and CHEN Jianxin
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Maintenance Center of Yunyong Ecological Forest,Foshan,Guangdong,Maintenance Center of Yunyong Ecological Forest,Foshan,Guangdong,Maintenance Center of Yunyong Ecological Forest,Foshan,Guangdong,Guangdong Academy of Forest,Guangzhou,Guangdong Academy of Forest,Guangzhou,Guangdong Academy of Forest,Guangzhou
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| Abstract: |
| By using Li 6400 portable photosynthesis system, we measured 18 landscaping trees including Michelia maudiae for comparative studies on photosynthetic and physiological parameter characteristics, such as photosynthesis, transpiration, and water use efficiency etc., and photosynthesis and photo response characteristic of Michelia maudiae and others in natural habitats in Guangzhou, South China. The results showed that the photosynthesis light response curves of the 18 species could be well simulated by the non rectangular hyperbola model (R2＞0.99). The maximum net photosynthetic rate was between 8.15~22.02 μmol·m-2·s-1, apparent quantum yield was between 0.045~0.234, light saturation point was between 878.7~1 949.3 μmol·m-2·s-1, light compensation point was between 1.3~18.7 μmol·m-2·s-1. These tree species fell in between tropical shade plants and sun plants in photosynthetic characteristics. Bauhinia blakeana, Rhodoleia championii, Bombax ceiba, Lagerstroemia indica and Barringtonia racemosa had higher net photosynthetic rate and water use efficiency than the others. Among all 18 species, water use efficiency (WUE) was highest for Spathodea campanulata and lowest for Lagerstroemia speciosa, while transpiration rate was the opposite, suggesting that WUE of landscape trees in this region was influenced by transpiration rate. |
| Key words: net photosynthesis rate transpiration rate water use efficiency main landscape species South China |
