3种生态型红叶石楠冬季光合特性研究

摘要

Determination was made on photosynthetic characteristics of 8-year Photinia×fraseri‘Red Robin’ with full exposure spherical and cylindrical shape, shading spherical in 2013. The result showed that diurnal variation of stomatal conductance had same curve of that of transpiration rate and transpiration of tested trees. Full exposure spherical tree had the highest photosynthetic efficiency and oxygen release. The result also demonstrated that shading spherical tree could not release oxygen. It concluded thatP.×fraseri‘Red Robin’ grows well under full exposure.%测定了全光照球形、柱形、遮荫球形三种生态型红叶石楠的冬季光合特性，结果表明：红叶石楠的气孔导度、蒸腾速率及蒸腾总量的日变化曲线相似，三种生态型都呈现出12：00－22：00时变化平稳，22：00后逐渐增高，4：00左右回落，6：00开始逐渐上升，8：00－12：00蒸腾活跃；全光照球形光合效率高、释放氧大于柱形，遮荫球形不能释放氧；红叶石楠适宜种植在没有任何遮荫的全日照条件。