摘要
分别对生长于冬季和夏季的五倍子蚜虫冬寄主藓类植物湿地匍灯藓 (Plagiomniumacutum (Lindb .)T .Kop .)和侧枝葡灯藓 (Plagiomniummaximoviczii(Lindb .)T .Kop .)的净光合速率及其与光照、温度的关系进行了比较研究 .结果表明 ,2种藓类的最大光合能力在夏季分别为 12 5 6 7和 94 6 3μmolCO2 ·kg-1DW·s-1,而在冬季只有 5 8.1和 6 2 .1μmolCO2 ·kg-1DW·s-1;其暗呼吸强度夏季也比冬季显著增强 ;光补偿点均在 2 0～40 μmol·m-2 ·s-1,光饱和点在 2 0 0～ 40 0 μmol·m-2 ·s-1之间 ,夏季比冬季略高 .它们在夏季的表观量子效率分别为 1 5 35和 1 5 5 9,冬季只有 0 45 6和 0 45 9.光合最适温度在 2 0～ 35℃之间 ,夏季比冬季有所升高 .在 0～ 2 0℃条件下测得的温度系数 ,在不同季节和不同种类均相似 ,约在 1 15～ 1 2 3之间 .它们对高温和低温都表现出一定的抗性 ,在 -15～ -10℃的低温以及 40～
A comparative study on the photosynthetic characteristics of Plagiomnium acuium (Lindb.)T.Kop. and P.maximoviozii (Lindb.)T.Kp.,two overwintering host mosses for Chinese gall aphid( Schlechtendalia chinensis ),was conducted by using CI 301PS in Summer and Winter.The results showed that the photosynthetic capacity of these two mosses species was 125.67 and 94.63μmol CO 2·kg -1 DW·s -1 in Summer,and 58.1 and 62.1μmol CO 2·kg -1 DW·s -1 in Winter,respectively.The dark respiration rates of these two species in Summer significantly exceeded those in Winter.The light complementary point of these two mosses species was in the range from 20 to 40μmol·m -2 ·s -1 ,and light saturated point was from 200 to 400μmol·m -2 ·s -1 ,with higher value in Summer and lower value in Winter.Their apparent quantum yields were 1.535 and 1.559 in Summer,but only 0.456 and 0.459 in Winter.The optimum temperature for photosynthesis of these two mosses species was 20 to 35℃,also higher in Summer and lower in Winter.No matter which species and growing season,the temperature coefficients(Q 10 ) measured in the range of 0～20℃ were similar,ranging from 1.15 to 1.23.These two moss species could maintain a certain net photosynthesis for 10～30 minutes under temperature stress from -15 to -10℃ and from 40 to 45℃.
出处
《应用生态学报》
CAS
CSCD
2001年第1期39-42,共4页
Chinese Journal of Applied Ecology
基金
湖南省教委"八五"重点项目
关键词
倍蚜冬寄主
藓类植物
匍灯藓属
光合作用
光响应风线
温度响应曲线
Winter host mosses of gall aphids, Plagiomnium , Photosynthesis, Light response curve, Temperature response curve.
