两种匍灯藓属植物夏季和冬季光合特性的比较研究

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(Plagiomnium acutum(Lindb.)T.Kop.)和侧枝葡灯藓(Plagiomnium maximoviczii(Lindb.)T.Kop.)的净光合速率及其与光照、温度的关系进了比较研究.结果表明，2种藓类的最大光合能力在夏季分别为125.67和94.63μmolCO2

Photosynthetic characteristics of two plagiomnium mosses in Summer and Winter

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 94.63 mumol CO2.kg-1DW.s-1 in Summer, and 58.1 and 62.1 mumol CO2.kg-1DW.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 40 mumol.m-2.s-1, and light saturated point was from 200 to 400 mumol.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 degrees C, also higher in Summer and lower in Winter. No matter which species and growing season, the temperature coefficients(Q10) measured in the range of 0-20 degrees C 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 degrees C and from 40 to 45 degrees C.