不同种源马尾松光合能力的比较研究

对28个马尾松种源试验林(9年生)的9个种源测定了净光合速率、暗呼吸速率、单株叶量、光合生产率及有关生理指标的日变化和季节变化,表明上述指标在各种源间差异显著,单株光合生产率与种源关系密切。南带种源具声最高的净光合生产率、低的暗呼吸速率、高的单株叶量和光合生产率。联系种源原产地的生态环境和生长习性,证明南带种源马尾松的速生性具有内在的遗传基础。

A Compara tive Study on the Photosynthetic Rates of Different Provenances of Masson's Pine

A comparative study was made on the photosynthetic characters (e?g? net photosynthetic rate, dark respiration rates, leaf weight of per tree and photosynthetic productivity) as well as on some of their diurnal and seasonal varia tions of 9 masson's pine provenances from Gaozhou, Guangdong etc.It is shown that the indicies above-mentioned have marked differences between provenances and that provenances in southern zone have the highest net photosynthetic rates,high leaf weight and photosynthetic productivities, and lowest dark respiration rates. It is further observed that there isn't any close corr-elation between increment and net photosynthetic rate but the line relationship is remarkable between increment and photosynthetic productivity.