| 华南8号木薯光响应参数日变化及其主要影响因子 |
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| 引用本文： | 左应梅,杨重法,邓权权,唐建,陈惠娟.华南8号木薯光响应参数日变化及其主要影响因子[J].中国农学通报,2010,26(13):371-375. |
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| 作者姓名： | 左应梅 杨重法 邓权权 唐建 陈惠娟 |
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| 作者单位： | 海南大学农学院,海南儋州,571737 |
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| 基金项目： | 海南省作物栽培学与耕作学重点学科资助，教育部“留学回国人员科研启动基金”[2008]980资助 |
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| 摘 要： | 摘要：采用Li-6400光合作用测定仪研究华南8号木薯的光合作用日进程，结果表明：华南8号的Pmax日变化呈单峰曲线，峰值出现在上午9:00左右，“午休现象”不明显。午间叶片光合能力的轻微减弱主要受到非气孔因素影响。最大净光合速率（Pmax）、表观量子效率（a）、光补偿点（LCP）、光饱和点（LSP）等光合参数在一天中是不断变化的。7:00～17:00，Pmax（CO2）变幅为：23.65～32.87μmol?m-2?s-1；a变幅为：0.0482～0.0683；LCP变幅为：30.60 ～50.78μmol?m-2 s-1；LSP变幅为：1845.64 ～2418.60μmol?m-2 s-1。多元逐步回归分析结果表明：各光合参数的主要影响因子分别是，a为RH，显著正效应；LCP为PAR，显著正效应；LSP为Cond和Vpdl，其中Cond为显著正效应，Vpdl为不显著负效应，效应大小依次为Cond＞-Vpdl；Pmax的主要影响因子是Cond、RH和Ci，其中Cond和RH为极显著正效应，Ci为不显著负效应，效应大小依次为Cond＞RH＞-Ci。
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| 关 键 词： | 沼气池 沼气池 冬季 研究进展 |
| 收稿时间： | 2010-01-11 |
| 修稿时间： | 2010-03-25 |
The Diurnal Variation of Light Parameters and the Main Impact Factors of Cassava South China 8 |
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| Zuo Yingmei,Chen Huijuan,Yang Zhongfa,Deng Quanquan,Tang Jian.The Diurnal Variation of Light Parameters and the Main Impact Factors of Cassava South China 8[J].Chinese Agricultural Science Bulletin,2010,26(13):371-375. |
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| Authors: | Zuo Yingmei Chen Huijuan Yang Zhongfa Deng Quanquan Tang Jian |
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| Institution: | (College of Agronomy, Hainan University, Danzhou Hainan 571737) |
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| Abstract: | For a general study of the daily variation regulation of the photosynthetic parameters and its relationship between the main impact factors of Manihot esculenta Crantz.cv.M. South China 8（SC8） . The diurnal variation of photosynthesis of SC8 is measured and analyzed by employing LI-6400 portable photosynthesis system. The results show that the curve representing the diurnal course of the maximum net photosynthetic rate（Pmax）of SC8 has a single peak, at which the maximum net photosynthetic rate reaches the maximum value at 9：00.And this indicates that there existed no obvious ＂midday depression＂ in photosynthesis of SCS.The dominant factor of slight declining in photosynthesis which is caused by non-stomatal limitation. The light parameters of Maximum net photosynthetic rate（Pmax）, Apparent quantum efficiency （a） , Light compensation point （LCP）, Light saturation point （LSP） of the leaves are changing continuously during the day. From 7：00 to17：00,the Pmax（CO2）ranging between 23.65-32.84μmol/（m2·s）;the a ranging between 0.0482- 0.0683;the LCP ranging between 30.60-50.78 μmol/（m2·s）;the LSP ranging between 1845.64-2418.60μmol/ （m2·s）.The results of multiple stepwise regression analysis show that RH is the main factor which affects on a, as a significant positive effect; PAR is the main factor which affects on LCP, as a significant positive effect; Cond and Vpdl arc the main factors which affect on LSP and the order of effecting is Cond（significant positive effect）〉 Vpdl（ no significant negative effect）;Cond, RH and Ci are the main factors which affect on Pmax and the order of effecting is Cond（very significant positive effect）〉 RH（very significant positive effect）〉 Ci （no significant negative effect）. |
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| Keywords: | cassavazz light responsezz diurnal variationzz impact factorszz |
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