天津滨海区草坪草净光合与蒸腾速率日变化特征

研究晴天条件下4种草坪草在不同供水处理下净光合速率和蒸腾速率的日变化特点。结果表明:草地早熟禾(Poa pratensis)和日本结缕草(Zoysia japonica)的净光合速率日变化曲线为双峰型,而高羊茅(Festuca arundinacea)和匍匐翦股颖(Agrostis stolonifera)为3峰型。草地早熟禾、高羊茅、匍匐翦股颖在供水处理间净光合速率差异极显著,而日本结缕草差异不显著;4种草坪草蒸腾速率的日变化曲线均为双峰型;草地早熟禾、高羊茅在供水处理间蒸腾速率差异极显著,匍匐翦股颖差异显著,日本结缕草差异不显著;草地早熟禾与高羊茅水分条件宜在(70%~55%)W,日本结缕草和匍匐翦股颖以(55%~40%)W为宜。

Study on the Diurnal Variation Characteristics of Net Photosynthesis Rate and Transpiration Rate of Turfgrass in Tianjin Seashore Region

The diurnal variation characteristics of net photosynthesis rate and transpiration rate of 4 species of turfgrass with different water supply treats in sunny days were studied. The results show that the net photosynthesis rate diurnal variation curves of kentucky bluegrass and japanese lawngrass were double-peaked, while the curve of tall fescue and creeping bentgrass were three-peaked. The discrepancy of net photosynthesis rate among kentucky bluegrass, tall fescue, and creeping bentgrass with different water supply treats was extremely notable, while the variation of net photosynthesis among japanese lawngrass with different water supply treats was slight. The transpiration rate diurnal variation curves of 4 species of turfgrass were all double-peaked. The discrepancy of transpiration rate between kentucky bluegrass and tall fescue with different water supply treats was conspicuously notable. The transpiration rate of creeping bentgrass with different water supplies varied, but that of japanese lawngrass watered variably corresponded to each other. Optimal amount of watering of kentucky bluegrass and tall fescue was (70%～55%)W,while that of japanese lawngrass and of creeping bentgrass was (55%～40%)W.