3种能源树种光合作用比较研究

通过测定乌桕、黄连木、油桐的光合作用及其周围环境因子的日变化,分析、比较3 种能源树种的光合作用日变化,以期为其栽培利用提供理论基础.结果表明:气温、光强均呈单峰型,空气相对湿度呈"U"型.净光合速率、蒸腾速率日变化3 个能源树种均呈单峰型.净光合速率、蒸腾速率、水分利用效率日均值为油桐＞乌桕＞黄连木,并且油桐、乌桕净光合速率、水分利用效率日均值均与黄连木存在显著差异(P＜0.05).3 种能源树种的气孔导度与其净光合速率均为显著正相关,油桐、乌桕胞间CO2浓度与净光合速率为极显著负相关.

Comparative study on the photosynthesises of three bio-energy trees

Diurnal changes of the photosynthesises of Sapium sebiferum,Pistacia chinensis,Vernicia fordii and its environmental factors were compared to provide a theoretical basis for cultivation and utilization.The results we reported were as follows: temperature and light intensity presented as synchronous single-peak curves,while air relative humidity as "U" curve.Diurnal changes of net photosynthetic rate and transpiration rate of three bio-energy species were single-peak curves.Diurnal average of net photosynthetic rate,transpiration rate and water utilization efficiency ranked Vernicia fordii>Sapium sebiferum>Pistacia chinensis.The diurnal average of net photosynthetic rate and water use efficiency of Vernicia fordii and Sapium sebiferum achieved significant difference with those of Pistacia chinensis(P<0.05).Net photosynthetic rate of three bio-energy trees were significantly and positively related with their stomatal conductance while there were very distinctively negative relation between intercellular CO2 concentration and net photosynthetic rate of Vernicia fordii and Sapium sebiferum.