马尾松净光合速率初步研究

本文研究了马尾松一年生苗的鳞叶及幼树１、２年生针叶的月龄与净光合速率的变化规律；马尾松天然更新树团的生境，生产结构，净光合速率及净生产力的变化。进一步论述了马尾松的光合生态特性，并据此对马尾松育苗，培育过程中抚育管理措施制订及实施的最佳时段进行了论证。

A PRELIMINARY STUDY ON THE NET PHOTOSYNTHESIS OF MASSON'S PINE

This paper mainly deals with the changes of the rate of net photosynthesis(Pn)which varied with leaf age,including primordial leaf of seedlingsand 1 or 2-year-old needles of young trees of Pinus massoniana.Thehabitat,productive structure and the variation of net photosynthesis and netprimary productivity were also studied of the groves which were.formed bynatural regeneration.The research results showed that peak value of Pnoccurred during July for primordial leaves and the rate of Pn varied in abiparabolic curve for 1 or 2-year-old needles.In order to improve the net primary productivity of the natural stands of this species,the productive structureof the groves should be properly controlled.