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《Journal of Anhui Agricultural Sciences》 2008-18
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Study on the Daily Variations of Photosynthesis Rate in Leaves of Tamarix ramosissima

LI Yi et al (College of Forestry,Gansu Agricultural University,Lanzhou,Gansu 730070)  
[Objective] The purpose was to reveal the daily variation law of photosynthesis character of Tamarix ramosissima under typical weather conditions. [Method] GSF-3000 photosynthesis analyzer was used to observe the daily variation of photosynthesis of 5-yeay-old T.ramosissima grown under natural conditions of artificial plantation and study the relationship between the ecological factors and photosynthesis.[Result] In the typical sunny days,the curve of daily variation of net photosynthetic rate was single-peak curve and its peak occurred at 12:30 a.m.,with the maximum value of 6.043 mol/(m2·s).The curve of daily variation of transpiration rate was double-peaks and the peak appeared at 12:30 and 15:30,with the maximum values of 6.236 and 5.954 mmol/(m2·s),resp.By using the methods of correlation analysis and stepwise multi-regress analysis,the regress equation among the photosynthetic rate and transpiration rate with 9 environmental influencing factors such as atmosphere CO2 concn.,intercellular CO2 concn.,water air pressure and deficit of water air pressure was constructed,with their correlation coefficients being 0.990 and 0.998,resp.[Conclusion] Photosynthesis rate and transpiration rate of T.ramosissima leaves showed different variations character.
【Fund】: 国家科技攻关项目(2004BA901A15);; 兰州市“种子资金”项目(04-1-32)
【CateGory Index】: S793.5
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