Study on Diurnal Changes of Photosynthetic Characteristics of Juglans regia(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Study on Diurnal Changes of Photosynthetic Characteristics of Juglans regia

Author(s):: YANG Yu-hua¹; ZONG Jian-wei¹; 2; YANG Feng-ling¹; LIANG Ya-hong¹; YUE Han-qiu¹; 1.Key Laboratory Ecological Restoration Hilly，College of Natural Resources and Environment Sciences，Pingdingshan University，Pingdingshan，Henan 467000;
2.College of Forestry，Northwest Agricuture and Forestry University，Yangling，Shannxi 712100

Keywords:: Juglans regia; diurnal change of photosynthesis; net photosynthetic rate; transpiration rate

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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Last Update: 2014-08-26