光照强度对两种彩叶玉簪生长及光合特性的影响

在全光照和透光率50%、30%、10%的4种光照条件下,对‘黄金叶’和‘金鹰’两种彩叶玉簪的生长及光合特性进行了研究。结果表明:4种光照条件下,两种彩叶玉簪Pn、Gs、Tr及Ci的日变化均呈双峰型曲线;不同程度的遮阴均能增加两种彩叶玉簪的叶片长度、宽度、植株高度及叶面积,并使植株的地上部及地下部的生物量也增加,其中‘黄金叶’玉簪植株在透光率30%条件下生长最好,透光率50%条件下更有利于‘金鹰’玉簪的干物质积累,这两种处理均与全光照处理呈显著差异(p<0.05)。可见,30%和50%透光条件是两种彩叶玉簪生长发育较好的环境条件,更有利于其光合效率的提高及光合产物的积累。

The effect of different light intensity on the growth and photosynthesis characteristics of two kinds of colorful Hosta

The growth and photosynthesis characteristics of two kinds of colorful Hosta were studied under light transmittance of 100 %,50 %,30 %,10 %.Results indicated that curves of diurnal variation in P_n,G_s,T_r and C_i had double-peaks;appropriate shade could increase the leaves length,width,plant height and leaf area of the two kinds of colorful Hosta,also the above-and below-ground biomass were increased.Under the condition of 30 % light transmittance,H.’Sieboldiana Gold’ grew best;under the condition of 50 % light transmission,H.’Gold Edger’was more favorable to the dry matter accumulation,there were significant differences(p<0.05)between the above two treatment and the full light treatment.It was thus clear that 30 % and 50 % light treatment were the best light intensity that could improve the utilization of light and increased the dry matter accumulation of H.’Sieboldiana Gold ’and H.’Gold Edger’,respectively.