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对不同部位不同叶龄杉木针叶净光合速率在生长季节典型晴天里的日变化进程进行了测定,本试验得到3点主要结论:(1)叶龄相同时,不同部位的杉木针叶净光合速率差异明显,均表现为上部>中部>下部;下部针叶净光合速率远低于上部和中部针叶。(2)相同树冠高度部位条件下,不同叶龄的杉木针叶净光合速率具有明显差异,均表现为1年生叶与2年生叶净光合速率差异较小,但两者均明显高于3年生叶。(3)对针叶净光合速率影响最大的环境因子为光照强度,其次为湿度,温度影响相对最小。研究结果表明,适当的修枝不会对杉木修枝林分的生长产生决定性的影响,这为杉木无节材定向培育的修枝作业技术提供了理论依据。
The diurnal course of diurnal variation of net photosynthetic rate of needles in different parts of Chinese fir in typical sunny days was measured. The main conclusions of this study are as follows: (1) When the leaf age is the same, the net photosynthetic rate The difference of speed was obvious, both showed as top> middle> bottom; the net photosynthetic rate of lower conifer was much lower than that of top and middle conifer. (2) There were significant differences in net photosynthetic rate of needles with different leaf ages under the same canopy height, which showed that there was a slight difference in net photosynthetic rate between one-year leaf and two-year leaf, but both of them were significantly higher than those of three years leaf. (3) The environmental factors that have the most influence on the net photosynthetic rate of needles are light intensity, followed by humidity, and the influence of temperature is relatively minimum. The results show that proper pruning will not have a decisive influence on the growth of Chinese fir pruning branches, which provides a theoretical basis for the pruning operation of Chinese fir non-oriented cultivation.