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Study on diurnal variation of photosynthesis for Medicago sativa in arid area

Cheng Zhao

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Abstract

This paper used CIRAS photosynthesis device which was made by British PP system company,to study the diurnal variation of photosynthesis for Medicago sativa in the area of Fukang under natural conditions.The results showed that 1)The variation curve of Medicago sativa showed two-peaks curve,and at 14:00,15:00 of Beijing time,the photosynthesis for Medicago sativa exhibited an obvious midday depression phenomena.2) The photosynthetic rate(Pn) sativa was 15.60 [μmol/(m2·s),CO2] daily averagely,with the highest value of 21.10 [μmol/(m2·s),CO2] at 12:00,and minimum of 1.16 [μmol/(m2·s),CO2] at 21:00.3) The analysis of stepwise multiple regression and path coefficient showed that the photosynthetic active radiation(PAR),transpiration rate(Tr) and intercellular CO2 concentration were the main direct factors which affected the diurnal variation of Pn.

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What this paper is about

This paper used CIRAS photosynthesis device which was made by British PP system company,to study the diurnal variation of photosynthesis for Medicago sativa in the area of Fukang under natural conditions.The results showed that 1)The variation curve of Medicago sativa showed two-peaks curve,and at 14:00,15:00 of Beijing time,the photosynthesis for Medicago sativa exhibited an obvious midday depression phenomena.2) The photosynthetic rate(Pn) sativa was 15.60 [μmol/(m2·s),CO2] daily averagely,with the highest value of 21.10 [μmol/(m2·s),CO2] at 12:00,and minimum of 1.16 [μmol/(m2·s),CO2] at 21:00.3) The analysis of stepwise multiple regression and path coefficient showed that the photosynthetic active radiation(PAR),transpiration rate(Tr) and intercellular CO2 concentration were the main direct factors which affected the diurnal variation of Pn.

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Available abstract

This paper used CIRAS photosynthesis device which was made by British PP system company,to study the diurnal variation of photosynthesis for Medicago sativa in the area of Fukang under natural conditions.The results showed that 1)The variation curve of Medicago sativa showed two-peaks curve,and at 14:00,15:00 of Beijing time,the photosynthesis for Medicago sativa exhibited an obvious midday depression phenomena.2) The photosynthetic rate(Pn) sativa was 15.60 [μmol/(m2·s),CO2] daily averagely,with the highest value of 21.10 [μmol/(m2·s),CO2] at 12:00,and minimum of 1.16 [μmol/(m2·s),CO2] at 21:00.3) The analysis of stepwise multiple regression and path coefficient showed that the photosynthetic active radiation(PAR),transpiration rate(Tr) and intercellular CO2 concentration were the main direct factors which affected the diurnal variation of Pn.

Key concepts: Medicago sativa, Photosynthesis, Transpiration, Diurnal temperature variation, Botany, Stomatal conductance, Horticulture, Biology

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