不同品种欧洲卫矛光合特性

以4个欧洲卫矛品种‘红瀑布’(Euonymus europaea‘Red Cascade’)、‘八仙花’(E.europaea‘Aldenhamensis’)、‘白果’(E.europaea‘Albus’)、‘密枝’(E.europaea‘Pumilis’)2年生嫁接苗为试验材料,对其光合日变化规律、光响应曲线及环境因子进行了测定。结果表明:光合有效辐射(PA,R)是影响4个品种净光合速率(Pn)的主要因子;‘八仙花’与‘密枝’净光合速率(Pn)日变化规律呈"双峰型",具有光合"午休"现象,而其他2个品种的日变化规律均呈"单峰型";4个品种光补偿点(LC,P)均大于40μmol·m~(-2)·s~(-1),表现为阳性植物,‘白果’和‘密枝’对光环境的要求较低,可栽植范围广;‘白果’的抗旱能力较差,‘密枝’的抗旱能力较强,这2个品种均表现出较好的光合能力,可作为国内引种栽培的优先选择品种。

Photosynthetci Characteristicsof Different Euonymus europaea Varite ies

With four 2-a-grafting Euonymus eru opaea cultivars ( E.europaea'Red Cascade ' , E.europaea'Aldenhamensis' , E. europaea 'Albus', and E.e uroap ea'Pumilis' ) as test materials, we measured the photosynthesis-related parameters and light response curves of them.Photosynthetically active radiation (P A,R ) was the key limiting factors affecting photosynthet-ic capacity of four cultivars.The diurnal variation ofE .europaea'Aldenhamensis' and E.euroap ea'Pumilis' were"bi-modal" , also named"midday depression".The diurnal variation of other two varieties were"single peak".Light compen-sation point ( LC,P ) of all cultivars were more than 40μmol· m-2 · s-1 , showing positive plant characteristics.E.europaea'Albus' and E.europaea'Pumilis' showed a strong adaptability to the light environment.The drought resistant ability of E.europaea'Albus' was poor, and drought resistant ability of E.europaea'Pumilis' was strong.In conclusion, E.euro-paea'Albus' and E.europaea'Pumilis' were the best cultivar for introduction and cultivation in domestic due to their high photosynthetic capacities.