YANG Yu-hua,ZONG Jian-wei,YANG Feng-ling,et al.Study on Diurnal Changes of Photosynthetic Characteristics of Juglans regia[J].Northern Horticulture,2013,37(20):31-33.
核桃光合日变化的特征研究
- Title:
- Study on Diurnal Changes of Photosynthetic Characteristics of Juglans regia
- 文章编号:
- 1001-0009(2013)20-0031-03
- Keywords:
- Juglans regia; diurnal change of photosynthesis; net photosynthetic rate; transpiration rate
- 分类号:
- S 664.1
- 文献标志码:
- B
- 摘要:
- 以“辽核4号”核桃品种为试材，采用Li-6400便携式光合测定仪，研究了核桃品种的光合日变化规律。结果表明：核桃净光合速率（Pn）日变化呈现“双峰”型曲线，峰值分别出现在10:00左右和16：00左右，且首次峰值比第2次峰值高出48.40%，最大光合速率为6.1125 μmol·m-2·s-1，14:00有明显 “午休”现象；核桃蒸腾速率(Tr)日变化也呈现“双峰”型曲线，峰值分别出现在10:00左右和14：00左右，且首次峰值低于第2次峰值，最大蒸腾速率为1.7989 mmol·m-2·s-1；核桃在午间净光合速率(Pn)和气孔限制值(Ls)均呈现下降趋势，而胞间CO2浓度(Ci)升高，因此非气孔限制因素是影响核桃光合作用的主要限制因素。
- Abstract:
- Taking Juglans regia ‘Liaohe 4’ as material，diurnal changes of photosynthetic characteristics were studied by Li-6400 portable photosynthesis analyzer.The results showed that the diurnal changes of the net photosynthetic rate（Pn）in the cultivar exhibited double peak curve at 10:00 and 16:00 respectively and the prime peak was 48.40% higher than the second peak，the maximum photosynthetic rate was 6.1125 μmol·m-2·s-1,significant midday depression phenomenon occurred at 14:00;the diurnal changes of the transpiration rate （Tr） in the cultivar displayed double peak curve at 10:00 and 14:00 respectively and the first peak higher than the second peak，the maximum transpiration rate was 1.7989 mmol·m-2·s-1;during midday，net photosynthetic rate (Pn) and stomatal limitation value (Ls) of walnut generally displayed a declining trend，however，intercellular CO2 concentration (Ci) increased.Therefore，non-stomatal limitation was the major factor influencing photosynthesis of Juglans regia.
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备注/Memo
第一作者简介：杨雨华(1980-)，女，河南商丘人，博士，讲师，研究方向为植物光合作用与植物生理生态学。E-mail：yyzdx2003@163.com.