Studies On Photosynthetic Characteristics In Lycium Chinense Mill

This study used environment ecological factor, motion characteristic of stoma and Farquhar's biochemistry model to investigated Photosynthesis of Lycium Chinese Mill, so as to open out characteristic and rule of Photosynthesis of Lycium Chinese Mill ,further to gave groundwork to photosynthesis mechanism and provided theoretic suggests for production practice at last.1.Daily variation type of Lycium Chinese Mill net photosynthesis rate is double peak type in natural conditions.Under shading, fixed temperature and heavy CO₂ concentration couldn't change the type ,only can be mitigate the middy depression of photosynthesis;Illumination and temperature are main ecological factors which cause the Midday Depression .Apparent quantum yield daily variation of Lycium Chinense Mill is arcs of recesses type ,shading and increased CO2 concentration treatment cann't change its type ,but the temperature is the main ecological factor which effect the apparent quantum yield.2.Photosynthesis characteristic parameter of Lycium Chinense Mill appear ecological factor difference .Optimum leaf temperature (Topt) ,CO₂ saturation point (CSP ) ,semi-CO₂ saturation point (semi- CSP) increase;CO₂ compensation point (CCP) decreases as increasing photosyntectis available radiation;light saturation point (LSP) ,semi-light saturation point (semi-LSP) ,CO₂ saturation point (CSP) increases as increasing leaf temperature;Topt,LSP,semi-LSP increase and CSP decreases as increasing CO₂ concentration.3.Stomatal aperture of Lycium Chinense Mill was non-uniform closure in the day , most of the stomatal aperture between 0.2⁰.7 . Stomatal aperture was greatly related to net photosynthetic rate, stomatal conductance .When stomatal aperture all smaller ,the stomatal limitation became the main factor of photosynthesis;when stomatal aperture all bigger ,the non-stomatal limitation became the main factor of photosynthesis .4.Analysed through result of Farquhar's biochemistry model ,Under high photosynthetic available radiation (PAR > 600 n mol'm^'s"1), the non-stomatal limitation is the main factor of photosynthesis and show a transfer of wc,wj,wp;under low photosynthetic available radiation (semi-LSP) , the stomatal limitation the main factor of photosynthesis.