杉木林杆材阶段能量积累和分配的研究

The solar energy fixation, storage and distribution of the Chinese Fir plantation in Huitong Located Ecology Station of Hunan Province were studied. The results showed that the ability of fixing solar energy in center area for Chinese Fir plantation was 12 474×10\+8～31 943×10\+8 J·hm\+\{-2\}, and the energy fixed by Chinese Fir plantation regularly decreased with the increasing of stand density. The distribution ratio of solar energy in stand was in order as: needle<twig<root<trunk. In evenaged forest, the reason of energy decrease with the increasing of forest density was the decrease of the solar energy accumulations of trunk, while the solar energy accumulation of twig and needle kept stably. When the forest was fully crowned, the ability of fixing solar energy decreased with the increasing of forest ages. The ability of photosynthesis decreased more quickly when the forest density was larger. When the forest density was 3 550·hm\+\{-2\} the distribution ratio of solar energy in needle was the highest at the 14th year forest, while in the 16th year forest the distribution ratio in bark was 1.91 times of that of trunk, which meant that the trunk stopped growing and the forest was on the wane. When the accessibility entering the pole stage, the forest density was the main factor which affected the solar energy fixation. Proper intermidiate was a necessary means to increase the ability of photosynthesis.