毛竹光合动态研究

Study on the Photosynthetic Dynamic Variation of Phyllostachys edulis

采用L i-6400测定毛竹光合作用在不同时间尺度上的动态变化,同时对毛竹叶绿素含量的年动态进行了研究。结果表明:毛竹夏、秋季的光合日变化为双峰曲线,冬、春季的光合日变化为单峰曲线,气孔部分关闭是引起毛竹夏、秋季光合“午睡”现象的主要原因;毛竹光合年动态变化为三峰曲线,峰值分别在3月、6月和8月出现,年均值为6.03μmol.m-2.s-1;毛竹叶绿素含量年动态变化为双峰曲线,峰值分别在2月和10月出现,年均值为2.18mg.g-1。通过综合比较本文和其他毛竹光合作用的测定结果,认为气候条件和研究方法的不一致很可能是导致众多研究结果存在差异的主要原因。

Using Li-6400, the photosynthetic dynamic variation of Phyllostachys edulis was determined in deferent time scales. Meanwhile, the annual variation of chlorophyll content was studied. The results showed the diurnal variation of net photosynthetic rate （Pn） changed with season, bimodality in summer and autumn, and single peak curve in winter and spring. Stoma partly shut was the chief reason for photosynthetic midday depression in summer and autumn. The annual variation of photosynthesis followed a three-peak curve, peaks occurred in March, June and August, and the annual mean of Pn was 6.03 μmol· m^-2 . s^ -1 The annual variation of chlorophyll content was bimodality, peaks occurred in February and October, and the annual mean of chlorophyll content was 2.18 mg · g^-1. Comparing this paperb results with others, the author presumed the different climates and diffent study methods were the chief reasons that probably resulted in discrepancies in those study results.