摘要
为了比较直角双曲线模型、非直角双曲线模型与叶子飘模型的优缺点,研究阴生叶和阳生叶电子传递速率的差异,探讨环境/生物因素对电子传递速率等参数的影响,该文采用LI-6400XT荧光测定系统对黄河小浪底栓皮栎(Quercusvariabilis)、刺槐(Robinia pseudoacacia)叶片电子传递速率-光响应(J-I)曲线进行了测定,利用直角双曲线模型、非直角双曲线模型和叶子飘模型对J-I曲线进行了拟合。结果表明,3种模型对叶片J-I曲线拟合的决定系数(R2)在0.96以上,叶子飘模型的R2最高(> 0.99)。直角双曲线模型和非直角双曲线模型无法模拟植物叶片光系统II动力学下调现象,且不能得出饱和光强(Isat);直角双曲线模型对最大电子传递速率(Jmax)的模拟明显大于实测值;叶子飘模型能很好地模拟光系统II动力学下调现象,得出的Jmax和Isat均最接近实测值。对阴生叶和阳生叶J-I曲线研究发现,栓皮栎、刺槐阴生叶的Jmax分别低于阳生叶25.0%和18.0%,阳生叶的Isat分别高于阴生叶26.0%和10.1%。栓皮栎和刺槐Jmax与气温显著正相关;刺槐Isat与气温、土壤水分含量和净光合速率具有显著的正相关关系;栓皮栎和刺槐J-I曲线初始斜率α均与净光合速率呈显著负相关关系。
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-6400 XT 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. TheJmax 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.
作者
李理渊
李俊
同小娟
孟平
张劲松
张静茹
LI Li-Yuan;LI Jun;TONG Xiao-Juan;MENG Ping;ZHANG Jin-Song;ZHANG Jing-Ru(College of Forestry,Beijing Forestry University,Beijing 100083,China;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;Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2018年第10期1009-1021,共13页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(31570617和31100322)
中央高校基本科研业务费专项资金(YX2011-19)~~
关键词
栓皮栎
刺槐
叶子飘模型
阴生叶
阳生叶
电子传递速率
Quercus variabilis
Robinia pseudoacacia
Ye model
shaded leaf
sunlit leaf
electron transport rate
