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Simulation on the light-response curves of electron transport rate of Quercus variabilis and Robinia pseudoacacia leaves in the Xiaolangdi area,China |
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| Affiliation: | 1 College of Forestry, Beijing Forestry University, Beijing 100083, China 2 Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 3 Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China |
| Abstract: | Aims The objectives are to compare the merits and demerits of rectangular hyperbola, nonrectangular hyperbola and the electron transport rate light-response Ye model, to investigate the difference of electron transport rate between the shaded and sunlit leaves, and to discuss the influence of bioenvironmental factors on the characteristic parameters of electron transport rate.Methods The light-response (J-I) curves of electron transport rate were measured by the LI-6400XT fluorescence measurement system in Quercus variabilis and Robinia pseudoacacia plantations in north China. The rectangular hyperbola, nonrectangular hyperbola and the Ye model were used to simulate electron transport rate of the light-response curves.Important findings The results showed that the determination coefficient of the J-I curves fitted by three models were more than 0.96. Compared with the rectangular hyperbola and nonrectangular hyperbola, the determination coefficient of the Ye model was the highest (> 0.99). The dynamic downregulation of photosystem II and the saturated light intensity (Isat) cannot be simulated and obtained by the rectangular hyperbola model and the nonrectangular hyperbola model. The maximum electron transport rate (Jmax) obtained by the rectangular hyperbola model was obviously higher than the measured one. The dynamic downregulation of photosystem II was well simulated by the Ye model. The Jmax and Isat values obtained by the Ye model were close to the measured ones. The Jmax values of the shaded leaves of Quercus variabilis and Robinia pseudoacacia were 25.0% and 18.0% lower than the sunlit leaves, respectively. The Isat values of the sunlit leaves of Q. variabilis and R. pseudoacacia were 26.0% and 10.1% higher than those of the shaded leaves. Jmax of Q. variabilis and R. pseudoacacia was correlated with temperature. Isat of R. pseudoacacia was correlated with temperature, soil water content and net photosynthetic rate. The initial slope (α) values of the J-I curves for Q. variabilis and R. pseudoacacia had significant negative relationships with net photosynthetic rate. |
| Keywords: | Quercus variabilis')" >Quercus variabilis, Robinia pseudoacacia')" > Robinia pseudoacacia, Ye model, shaded leaf')" >shaded leaf, sunlit leaf')" >sunlit leaf, electron transport rate')" >electron transport rate |
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