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- W2348697060 abstract "Photosynthetic characteristics were studied by employing LI-6400 Portable Photosynthetic System to measure the diurnal variation of net photosynthetic rate(Pn) of Typha angustifolia,which grow in horizontal-subsurface constructed wetland units.The results were as follows: The curves of diurnal variation of Pn in leaves of Typha angustifolia showed two peaks,occurring at 9:00(22.0μmol.m-2.s-1) and 15:00(16.9μmol.m-2.s-1),respectively,which indicated a remarkable photosynthetic midday depressions.The mid-depress of Pn was primarily caused by nonstomatal limitations.The regression equation of the diurnal variation of Pn and its major physi-ecological factors attained by the method of stepwise multiple-regression was as follows: yPn = 0.7692+29.7059 xGs-0.7689xTr+0.014 2 xPAR(multiple correlated coefficient R=0.9563,significance level p=0.000 1).The analysis of partial correlation and path on Pn and factors showed that the diurnal variation of Pn had significant correlation with stomatal conductance(Gs),transpiration rate(Tr)and photosynthetically active radiation(PAR),respectively.Gs,Tr and PAR were the important factors which affected Pn and the order of effecting ability was Gs PAR Tr.The regression equation of Pn-PAR response curveswas yPn =-5×10-6 xPAR 2+0.0207 xPAR-1.3728(correlated coefficient R=0.9935,significance level,p=0.0001),light compensation point,light saturation point and apparent quantum yield was 32.9μmol.m-2.s-1、1476μmol.m-2.s-1、0.0233 mol.mol-1,respectively.The regression equation of Pn-CO2 response curves was yPn=-2×10-5 w(CO2) 2+0.054 9 w(CO2)-1.44 4(correlated coefficient R=0.9694,significance level,p=0.0001),carbon dioxide compensation point,carbon dioxide saturation point and carboxylation efficiency was 23.7μmol.mol-1、621.4μmol.mol-1 和 0.0768 mol.m-2.s-1,respectively." @default.
- W2348697060 created "2016-06-24" @default.
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- W2348697060 date "2009-01-01" @default.
- W2348697060 modified "2023-09-27" @default.
- W2348697060 title "Photosynthetic Characteristics and its Influencing Factors of Typha angustifolia" @default.
- W2348697060 hasPublicationYear "2009" @default.
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