猕猴桃的光合作用

Studies on the Photosynthesis in Kiwifruit Leaves

猕猴桃光合作用的光补偿点与光饱和点分别为50～88、678～922μmol·m^(-2)·s^(-1),光合最适叶温为25～31℃,因品种而有差异。光合作用的最适土壤相对含水量为68.8％～74.9％。不同品种及不同时期抽发的枝梢叶片光合速率有所不同。光合速率的日变化进程在阴天、多云天为单峰曲线,晴天为双峰曲线。高温干旱天,叶片光合作用与光合产物的积累主要在11～12时之前。光合速率的年变化进程主要受叶片发育状况、阶段性园地生态因素组成与物候期交替的综合影响。

The light compensation point and light saturation point of photosynthesis in kiwifruit leaves were 50~88 and 678~922 μmol ?m^2 ?s-1 respectively. The optimum leaf tempera-ture range of photosynthesis was 25~31℃, and varied among different varieties. The optimum soil relative moisture of photosynthesis was 68.8%~74.9%. Different varieties and shoots sprouting at different periods had different photosynthetic rates. The diurnal variation of leaf photosynthetic rate showed single-peak curve under overcast and cloudy weather condition, and double-peak curve under fine weather condition. Photosynthesis and accumulation of the photosynthetic substances under high temperature and dry wea ther condition occurred mainly before 11:00~12:00 o'clock. The annual fluctuation of photosynthetic rate was affected mainly by leaf development, weather condition during a certain period and the phenological features.