| 抗松材线虫病马尾松无性系夏季光合作用日变化研究 |
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| 引用本文： | 陈雪莲,郝焰平,姜春武,章健,徐六一,徐小牛.抗松材线虫病马尾松无性系夏季光合作用日变化研究[J].安徽林业科技,2013(4):20-24. |
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| 作者姓名： | 陈雪莲 郝焰平 姜春武 章健 徐六一 徐小牛 |
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| 作者单位： | [1]安徽省林业科学研究院,合肥230031 [2]安徽农业大学林学与园林学院,合肥230031 |
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| 基金项目： | 国家林业公益性行业科研专项经费项目（编号：201004072）,安徽省科技计划项目（编号：10010302001）. |
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| 摘 要： | 利用LI6400光合仪测定抗松材线虫病马尾松针叶的净光合速率，研究其夏季变化与生理生态因子的关系。结果表明：（1）抗性马尾松净光合速率日变化趋势呈现“双峰”曲线，峰值出现在10时和15时，有明显的“午休”现象。这种现象不是由于气孔阻力的增大而引起叶肉细胞间CO2亏缺造成的，而是非气孔限制起着主要作用。（2）净光合速率（Pn）与胞间CO2浓度（Ci）、蒸腾速率（Tr）、空气温度（Tair）、叶片温度（Tleaf）、光合有效辐射（PAR）都有极显著的相关关系．但经过通径分析发现，对Pn起作用的最主要因子是PAR。
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| 关 键 词： | 松材线虫 马尾松 光合速率 日变化 影响因子 通径分析 |
Study on the Photosynthesis Diurnal Variations of the Nematodiasis-resistant Clones of Pinus massoniana in Summer |
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| CHEN Xuelian,HAO Yanping,JIANG Chunw,ZHANG Jian,XU Liuyi,XU Xiaoniu.Study on the Photosynthesis Diurnal Variations of the Nematodiasis-resistant Clones of Pinus massoniana in Summer[J].Anhui Forestry Science and Technology,2013(4):20-24. |
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| Authors: | CHEN Xuelian HAO Yanping JIANG Chunw ZHANG Jian XU Liuyi XU Xiaoniu |
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| Institution: | 1 Anhui Academy of Forestry, Hefei 230031, China; 2.College of Forestry and Landscape Architecture, Anhui Agricultural University) |
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| Abstract: | The net photosynthetic rate （Pn） of the needles of the nematodiasis-resistant clones of Pinus massoniana were measured with Li-6400XT Portable Photosynthesis Analyzer to study the relationship between the diurnal variations of the Pn in summer and the physio-ecological factors. The following are the results. 1. The diurnal variation trend of the Pn of the nematodiasis-resistant Pinus massoniana clones showed a double-peak curve with the peaks at 10：00 and 15：00 and had an obvious phenomenon of midday depression. The phenomenon was caused not by shortage of CO2 among mesophyll cells arising from the decrease of stomatal conductance, but mainly by non-stomatal restrictions. 2. The Pn had significant correlation with the intercellular CO2 concentration （Ci）, transpiration rate （Tr）, air temperature （Tair）, leaf temperature （Tleaf） and photosynthetically active radiation （PAR）, and path analysis showed that the PAR was the main factor influencing the diurnal variations of the Pn. |
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| Keywords: | Nematode Pinus massoniana Photosynthetic rate Diurnal variations Impact factor Path analysis |
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