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2010•Xi'nan nongye xuebaoRequires access

Research on diurnal variations of photosynthetic characteristics and water use efficiency of Zizyphus jujube.

Chai ZhongPing, Xuemei Wang, Xia Sun, Pingan Jiang, Wu HaiHua

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Abstract

The variations of photosynthetic characteristics and water use efficiency of Zizyphus jujube in 9 Mission of the first farming army of Xingjiang were studied.The results showed that diurnal variations of Pn,Tr and Gs of Zizyphus jujube leaves all took on a curve with one summit,but the emerging time of summit was different.Summit of Pn was 21.2 μmol·m-2·s-1,summit of Tr was 4.33 mmol·m-2·s-1,summit of Gs was 286.5 mol·m-2·s-1,and their emerging time each was 13:00 Pm,13:00 Pm and 11:00 Am.The curve of diurnal variations of Ci was contrary to Pn,it began decreasing at 9:00 Am and reached low at 11:00 Am,but the curve of diurnal variations of Ls was same to Pn.When Ci was increasing,Ls was decreasing.The summit of WUE was 5.37 μmol CO2·mmol-1H2O,it emerged at 9:00 Am.After this,WUE began decreasing with Tr increasing.

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The variations of photosynthetic characteristics and water use efficiency of Zizyphus jujube in 9 Mission of the first farming army of Xingjiang were studied.The results showed that diurnal variations of Pn,Tr and Gs of Zizyphus jujube leaves all took on a curve with one summit,but the emerging time of summit was different.Summit of Pn was 21.2 μmol·m-2·s-1,summit of Tr was 4.33 mmol·m-2·s-1,summit of Gs was 286.5 mol·m-2·s-1,and their emerging time each was 13:00 Pm,13:00 Pm and 11:00 Am.The curve of diurnal variations of Ci was contrary to Pn,it began decreasing at 9:00 Am and reached low at 11:00 Am,but the curve of diurnal variations of Ls was same to Pn.When Ci was increasing,Ls was decreasing.The summit of WUE was 5.37 μmol CO2·mmol-1H2O,it emerged at 9:00 Am.After this,WUE began decreasing with Tr increasing.

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Available abstract

The variations of photosynthetic characteristics and water use efficiency of Zizyphus jujube in 9 Mission of the first farming army of Xingjiang were studied.The results showed that diurnal variations of Pn,Tr and Gs of Zizyphus jujube leaves all took on a curve with one summit,but the emerging time of summit was different.Summit of Pn was 21.2 μmol·m-2·s-1,summit of Tr was 4.33 mmol·m-2·s-1,summit of Gs was 286.5 mol·m-2·s-1,and their emerging time each was 13:00 Pm,13:00 Pm and 11:00 Am.The curve of diurnal variations of Ci was contrary to Pn,it began decreasing at 9:00 Am and reached low at 11:00 Am,but the curve of diurnal variations of Ls was same to Pn.When Ci was increasing,Ls was decreasing.The summit of WUE was 5.37 μmol CO2·mmol-1H2O,it emerged at 9:00 Am.After this,WUE began decreasing with Tr increasing.

Key concepts: Summit, Water-use efficiency, Diurnal temperature variation, Photosynthesis, Environmental science, Horticulture, Botany, Chemistry

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