嫩江中下游流域6种灌木光合特性及水分利用效率比较分析

Comparison of Photosynthetic Characteristics & Water Use Efficiency of 6 Kinds of Shrubs in the Middle and Lower Reaches of Nenjiang River Basin

对嫩江中下游流域生产上应用的6个主要灌木品种进行了盆栽模拟试验,采用L i-6400便携式光合测定系统对其主要光合参数及水分利用效率等进行了观测及比较分析。结果表明:在6个灌木品种中,紫丁香、小叶锦鸡儿水分利用效率较高,蒸腾速率较低,为相对节水、抗旱品种;大果沙棘与宁夏枸杞的水分利用效率较低,蒸腾速率较高,为相对耗水较大品种。测定结果在一定程度上揭示了这些灌木在生产中的适应性及现实生理生态特征。

Pot simulate tests were conducted on 6 kinds of shrubs which were used in production in the middle ＆ lower rea- ches of Nenjiang river basin. Main photosynthetic parameters and water use efficiency were observed and comparatively ana- lyzed by using Li-6400 Portable Photosynthesis System. Result shows that： among 6 varieties of shrubs, Syringa oblata, Caragana microphylla, which have higher water use efficiency and lower transpiration rate, are water-saving and anti- drought species relatively ;large berry cuhivars of seabuckthorn and Lycium barbarum in Ningxia, which have lower water use efficiency and higher transpiration rate, are relative water consumption species. To some extent, test results reveal adaptability of these species in the production and reality.