| Comparative study on the photosynthetic characteristics of rape and wheat in rain-fed agricultural region with high altitude in Qilian |
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| DOI：10.7606/j.issn.1000-7601.2012.04.21 |
| Key Words: photosynthetic characteristics rape wheat rain-fed agricultural region with high altitude in Qilian |
| Author Name | Affiliation | | JIANG Jufang | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Provice, Key Open Laboratory of Arid Change
and Disaster Reducing of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China
Agricultural Experiment Station, Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | WEI Yuguo | Agricultural Experiment Station, Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | WANG Runyuan | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Provice, Key Open Laboratory of Arid Change
and Disaster Reducing of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China | | WANG Heling | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Provice, Key Open Laboratory of Arid Change
and Disaster Reducing of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China |
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| Abstract: |
| The environmental factors, rape and wheat's photosynthetic parameters were measured by LI-6400 portable photosynthesis system in crop vigorous growing period. The difference of photosynthesis was compared between rape and wheat plants in the low altitude region. The results showed that the diurnal change of photosynthetic active radiation and temperature presented a signal pattern. The air humidity presented an “S” pattern. The CO2 concentration in air presented low in the morning and night, but high in the afternoon. The diurnal change of rape and wheat leaves' net photosynthetic rate presented a bimodal pattern, and had a depression at midday, and the net photosynthetic rate was also higher in the morning than that in the afternoon. The rape's transpiration rate presented a bimodal pattern. But wheat's transpiration rate presented a signal pattern. The stomatal conductance presented an “S” pattern in all. The
net photosynthetic rate was a main environmental factor which affected net photosynthetic rate and transpiration rate. Air humidity was a main affecting factor of stomatal conductance. There was a marked positive correlation between CO2 concentration in air and wheat leaves' net photosynthetic rate, transpiration rate and stomatal conductance. |
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