毛竹蒸腾动态研究

采用Li-6400测定毛竹蒸腾作用在不同时间尺度上的动态变化,结果表明:毛竹夏、秋季的蒸腾日变化为双峰曲线,冬、春季的蒸腾日变化为单峰曲线;毛竹蒸腾年动态变化为单峰曲线,1月份最低,仅为0.29 mmol·m-2·s-1;8月份最高,达3.90 mmol·m-2·s-1;年均值为1.46 mmol·m-2·s-1.与毛竹光合动态相比,不同季节毛竹的蒸腾作用与光合作用日变化一致,年变化则略有不同,光合年动态变化为三峰曲线,而蒸腾作用年动态变化为单峰曲线.

Study on the Tran spira tion Dynam ic Var ia tion of Phyllostachys edu lis

Used L i-6400, the transp iration dynamic variation of Phy llostachys edulis was determined in deferent timescales. The results showed that the diurnal variation of transp iration rate ( Tr) changed with season, bimodality insummer and autumn, and single peak curve in winter and sp ring. The annual variation of transp iration followed asingle peak curve, the peak (3. 90 mmolm^{-2<.sup> ·s-1<.sup> ) occurred in August, the lowest was only 0. 29 mmolm-2<.sup> ·s-1<.sup>in January, and the annualmean of Trwas 1. 46 mmolm-2<.sup> ·s-1<.sup>. Compared with the photosynthetic dynamic variation of Phy llostachys edu lis, the diurnal variation of transp iration and photosynthesiswere identical in the same season; but the annual variation was difference, three-peak-curve to photosynthesis and single-peak-curve to transp iration}