茶叶光合作用强度的因素再探

本研究对茶树不同品种和不同品系的光合量、不同海拔高度的同品种光合量,以及海拔升高后茶树生化内含物的含量进行了测定,并对一些品种的光强、水份、温度等光合条件进行了分析。结果表明:茶树品种间的光合量值悬殊颇大,云大和福鼎相差20—30％;地理经度改变,不影响品种的光合值;同纬度海拔上升,光合量下降,但各品种降值有大小,如四川中叶种降幅小于福鼎;海拔升高,主要生化内含物先升后降,以1200M为转折点;环境因素中,光强随品种需要而异,云大耐强光辐射,而福鼎宜于在中等光辐射下行使光合作用。本文还对茶园产量极值、茶园选择品种和植茶海拔高度问题进行了探讨。

A FURTHER STUDY ON FACTORS INFLUENCING PHOTOSYNTHESIS IN TEA

The present paper deals with the exploration for factors influencing photosynthesis in tea. The experiments involve a number of tea varieties in four regions. It is fount that 1) there is great difference of photosynthetic efficiency among varieties; 2) the photosynthetic efficiency of the same variety is negtively correlated with altitude, even though non correlated with longitude; and 3) biochemical substances contained in the same varieties of the same region increase with the altitued rising up to 1200 meters. Based on the above results, it is suggested that the region suitable for planting tea in Sichuan be limited below altitude of 1200 meters. Other implications of the results on the tea cultivation is also discussed.