氮、磷对107杨叶片光合作用的影响

Effects of Nitrogen and Phosphorus on Photosynthesis of Populus×euramericana cv."74/76"

为了研究氮、磷对107杨叶片光合作用的影响,本试验采用二次饱和D-最优设计,对氮、磷配比下盆栽107杨快速生长期的叶片净光合速率(Pn)、叶绿素含量、PSⅡ电子传递量子效率(ΦPsⅡ)、荧光猝灭系数(qP和qN)进行测定。结果表明,氮、磷的供给能明显提高叶片净光合速率(Pn)、叶绿素含量、PSⅡ电子传递量子效率(ΦPsⅡ)和荧光猝灭系数(qP和qN)。其中磷的作用和氮磷的交互作用都远远大于氮的作用。相关分析表明,Chlb含量与ΦPsⅡ、qP呈显著正相关,而PhiPS2、qP对Pn分别表现为显著、极显著的促进关系。由此可见,氮、磷供给是通过增加叶片Chlb含量,来影响光系统PSⅡ对光能的吸收和传递效率,从而影响植物叶片的净光合速率。

To study the effects of nitrogen and phosphorus on Populus × euramericana cv. ＂74/76＂ ,a D-optimal regression design with quadratic saturation was applied to determine the effects of nitrogen and phosphorus fertilization on rapid growth of cutting Populus × euramericana cv. ＂74/76＂ trees planted in pot container in terms of leaf net photosynthetic rate （Pn） , chlorophyll（chl） content, PSⅡ electron transfer quantum efficiency （ΦPsⅡ）, fluorescence quenching coefficient （ qP and qN）. The results showed that, the supply of nitrogen and phosphorus significantly improved Pn, chl content, ΦPsⅡ, qP and qN. The role of phosphorus and the interaction between nitrogen with phosphorus were far greater than the role of nitrogen. Correlation analysis showed that, between chlb content and ΦPsⅡ,qP had significant positive correlation. Between PhiPS2, qP and Pn respectively presented notable and very notable promoting relations. Thus it can be seen, the supply of nitrogen and phosphorus influence the absorption and transmission efficiency of the photosystem PSⅡ for luminous energy by increasing the leaf chlb content to effecting leaf net photosynthetic rate.