| 3种珍贵用材树种1年生苗木光合特性研究 |
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| 引用本文： | 殷国兰,谭斌,杨金亮,鄢武先,辜云杰,周永丽,冯绍玉.3种珍贵用材树种1年生苗木光合特性研究[J].云南林业科技,2014(3):81-87. |
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| 作者姓名： | 殷国兰 谭斌 杨金亮 鄢武先 辜云杰 周永丽 冯绍玉 |
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| 作者单位： | [1]四川省林业科学研究院,四川成都610081 [2]邻水县林业局,四川广安638500 |
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| 基金项目： | 盆周山地珍贵用材树种选育与培育技术研究（200904044-01）,桢楠良种选育技术研究（2012ZL0401）,桢楠无性系规模化繁育技术研究. |
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| 摘 要： | 以桢楠、香樟、红椿3个珍贵树种的1年生苗木为研究对象，测定并分析了其光合生理特性。结果表明，（1）净光合速率（Pn）、水分利用率（WUE）均表现为桢楠＞香樟＞红椿，而气孔导度（Gs）、胞间CO2浓度（ Ci）、蒸腾速率（ Tr）则表现为桢楠＜香樟＜红椿，在影响光合作用的各因素中， Tr在树种间的差异相对显著，表明影响3个树种有效光合物质积累的主要因素为蒸腾作用；（2）3个树种叶片的Pn值表现出了相似的对光照强度（ PAR）与CO2浓度的响应趋势，即在低光照强度或CO2浓度下， Pn值随着PAR或CO2浓度的增加而迅速增加，而在高光照强度或CO2浓度下， Pn值增加的趋势变缓，其中香樟叶片光补偿点（ Lcp ）及光饱和点（Lsp）分别为67.50μmol/（m^2· s）与473.10μmol/（m^2· s），其 CO2补偿点（Ccp）和饱和点（Csp）为111.30μmol/（ m^2· s）与1681.00μmol/（ m^2· s），均较红椿和桢楠高，其最大净光合速率（ Pmax ）也高于红椿和桢楠；（3）3个树种的Pn、 Tr、 Ci、 Gs和WUE参数日变化趋势基本一致，而且均表现出明显的“午休”现象，其中， Pn参数日变化呈双峰型曲线，峰值出现在10：00和16：00，且午前明显高于午后。
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| 关 键 词： | 桢楠 香樟 红椿 苗木 光合特性 |
Photosynthetic Characteristics of One-year-old Seedlings of 3 Precious Timber Tree Species |
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| YIN Guo-lan,TAN Bin,YANG Jin-liang,YAN Wu-xian,GU Yun-jie,ZHOU Yong-li,FENG Shao-yu.Photosynthetic Characteristics of One-year-old Seedlings of 3 Precious Timber Tree Species[J].Yunnan Forestry Science and Technology,2014(3):81-87. |
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| Authors: | YIN Guo-lan TAN Bin YANG Jin-liang YAN Wu-xian GU Yun-jie ZHOU Yong-li FENG Shao-yu |
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| Institution: | 1. Sichuan Academy of Forestry, Chengdu Sichuan 610081, P. R. China; 2. Lingshui County Forestry Bureau, Guangan Siehuan 638500, P. R. China) |
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| Abstract: | The photosynthetic characteristics of one-year-old seedlings of 3 precious timber tree species （ Phoebe zhennana, Cinnamomum camphora and Toona sureni） were studied.The main results are as follows： 1） Among 3 tree species, the values of Pn and WUE were Phoebe zhennana〉Cinnamomum camphora〉Toona sureni, and for Gs, Ci and Tr, the order was Phoebe zhennana〈Cinnamomum camphora〈Toona sureni.The values of Tr presented relatively significant difference among tree speices , and this means that the transpiration was the major factor in accumulating photosynthetic materials .2 ） Among 3 tree species , the values of Pn showed a tendency of similarity with responded to PAR and concentration of CO 2 .In lower PAR or concentration of CO 2 , the value of Pn increased sharply , while it increased slowly in higher PAR or concentration of CO 2 .The values of Lcp, Lsp, Ccp and Csp of Cinnamomum camphora were 67.50μmol/m^2· s, 473.10μmol/（m^2· s）, 111.30μmol/（m^2· s） and 1 681.00μmol/（m^2· s） respectively, and all values were higher than those of Phoebe zhennana and Toona sureni.Pmax of Cinnamomum camphora was also higher than that of Phoebe zhennana and Toona sureni.3） The values of Pn, Tr, Ci, Gs and WUE of 3 tree species showed similar diurnal changes and obvious midday depression .The diurnal change of Pn presented a double-peak type , with the peak value occurred at 10：00 and 16：00 respectively , and the Pn value in the morning was significantly higher than that in the afternoon . |
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| Keywords: | Phoebe zhennana Cinnamomum camphora Toona sureni seedling photosynthetic characteristic |
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