遮荫条件下绞股蓝光合作用特点的研究  

Photosynthetic characteristics of Gynostemma pentaphyllum under shade.

作　　者：黄成林[1] 吴泽民[1] 姚永康[1] 徐小牛[1] 

机构地区：[1]安徽农业大学森林利用学院,合肥230036

出　　处：《应用生态学报》2004年第11期2099-2103,共5页Chinese Journal of Applied Ecology

基　　金：国家"十五"科技攻关计划重大专项资助项目 (2 0 0 2BA5 16A16 0 9)

摘　　要：在夏季遮荫条件下栽培绞股蓝的净光合速率日变化呈现不典型的双峰曲线 ,第 1峰值出现在11:0 0时 ,达 13 8μmolCO2 ·m-2 ·s-1;日净光合速率达到 176 97μmolCO2 ·m-2 ,是强光下栽培的 3 1倍 ;净光合速率和光量子通量密度呈正相关 ,相对湿度对净光合速率的影响小 .强光下栽培绞股蓝 ,光合作用“午休”现象明显 ,净光合速率日变化呈现双峰曲线 ,第 1峰值出现在 10 :0 0时 ,为 3 0 μmolCO2 ·m-2 ·s-1,第 2峰值出现在 14 :0 0时 ,为 1 2 5 μmolCO2 ·m-2 ·s-1;相对湿度与净光合速率成正相关 ,对净光合速率的影响大 .当光量子通量超过 70 0 μmol·m-2 ·s-1时 ,净光合速率与光量子通量密度呈负相关 .在影响该植物蒸腾速率的诸多因子中 ,蒸腾速率和气孔导度之间的相关性最为显著 .因此绞股蓝属于高度耐荫而怕光的植物 ,人工栽培应重点考虑光照因子 .The study showed that under summer shade condition,the diurnal variation of net photosynthetic rate of Gynostemma pentaphyllum presented nontypical double apex,the first apex being 13.8 μmol CO 2·m -2 ·s -1 at 11:00,and the diurnal net photosynthetic rate was about 176.97 μmol CO 2·m -2 ,3.1 times of that under full sunlight.There was a positive correlation between net photosynthetic rate and photon flux density (PFD),and relative humidity had a small effect on net photosynthetic rate.Under full sunlight,the typical 'midday depression' of photosynthesis was observed,and the diurnal variation of net photosynthetic rate presented double apex,with the first apex being 3.0 μmol CO 2·m -2 ·s -1 at 10:00 and the second being 1.25 μmol CO 2·m -2 ·s -1 at 14:00.There was a positive correlation between net photosynthetic rate and relative humidity,and the latter had a strong effect on net photosynthetic rate.When PFD was higher than 700 μmol CO 2·m -2 ·s -1 ,it had a negative correlation with net photosynthetic rate.Stoma conductance was the main factor affecting the transpiration rate of Gynostemma pentaphyllum.Therefore,Gynostemma pentaphyllum was a typical sciophytic plant,and light factor should be considered firstly in its cultivation.

关 键 词：绞股蓝 蒸腾速率 气孔导度 光量子通量密度 净光合速率 

分 类 号：S567.2[农业科学—中草药栽培]