CHAI Zhong-ping,WANG Xue-mei,CHEN Bo-lang,et al.Research on Diurnal Variations of Photosynthetic Characteristics Pyrus bretschneideri Under Different Growth Stages[J].Northern Horticulture,2013,37(06):1-5.
香梨不同生长期光合特性日变化研究
- Title:
- Research on Diurnal Variations of Photosynthetic Characteristics Pyrus bretschneideri Under Different Growth Stages
- 文章编号:
- 1001-0009(2013)06-0001-05
- 分类号:
- S 661.2
- 文献标志码:
- A
- 摘要:
- 以20 a树龄的库尔勒香梨为试材，在田间条件下，利用CIRAS-2型光合仪对库尔勒香梨不同生长期（坐果期和膨果期）光合特性日变化进行了测定。结果表明：香梨叶片净光合速率日变化为双峰曲线，具有光合“午休”现象；气孔导度和气孔限制值日变化与净光合速率日变化基本保持一致，呈双峰型；胞间CO2浓度日变化与净光合速率相反，呈双谷型；蒸腾速率日变化曲线呈单峰型；水分利用效率日变化则呈单谷型。不同生长期香梨光合特性有明显差异，膨果期香梨叶片叶绿素含量、叶面积指数、净光合速率、蒸腾速率、气孔导度和气孔限制值都比坐果期高，胞间CO2浓度比坐果期低。水分利用效率在1 d之内有明显差异，11:30～13:30时膨果期低于坐果期，15:30～19:30时膨果期高于坐果期。
- Abstract:
- Taking 20-year-old Korla fragrant pear as material，the diurnal variation curves of photosynthetic characteristics of Korla fragrant pear under different growth stages (fruit setting stage，fruit enlargement stage) were measured by portable photosynthesis system CIRAS-2 in the field conditions.The results showed that the diurnal variation curves of Pn of Korla fragrant pear presented double-apex curves，and had a phenomenon of photosynthetic ‘Noon breaking’.The diurnal variation curves of Gs and Ls were the same as Pn，they also showed double-apex curves.The diurnal variation curves of Ci were contrary with Pn，they showed double-valley curves.The diurnal variation curves of Tr presented single-apex curves，but the diurnal variation curves of WUE showed single-valley ones.The photosynthetic characteristics of Korla fragrant pear under different growth stages were significant difference.The Chl content，LAI，Pn，Tr，Gs and Ls of Korla fragrant pear under fruit enlargement stage were higher than fruit setting stage，the Ci of Korla fragrant pear under fruit enlargement stage was lower than fruit setting stage.The WUE of Korla fragrant pear leaves had significant difference in one day；the fruit enlargement stage was lower than fruit setting stage from 11:30 to 13:30，the fruit enlargement stage was higher than fruit setting stage from 15:30 to 19:30.
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备注/Memo
第一作者简介：柴仲平（1974-），男，甘肃永昌人，博士，副教授，研究方向为土壤质量及植物营养。E-mail：zhongpingchai@yahoo.com.cn.