包头市外来园林树种对水分胁迫的适应性研究

对包头市14种外来园林树种的光合速率、气孔导度和水分状况测定研究表明:净光合速率水势补偿点和气孔导度变化临界点水势可作为评价树木对水分胁迫适应性的指标。应用净光合速率水势补偿点、气孔导度变化临界点水势、初始失膨点总体渗透势3个耐旱性指标对14个树种进行聚类分析,结果树种可分为5组,耐旱性由强到弱依次为:金山绣线菊;金焰绣线菊、水蜡、金叶复叶槭、金叶山梅花;金叶风箱果、紫叶矮樱、金边复叶槭、花叶复叶槭;金叶裂叶接骨木、紫叶锦带、金叶莸、花叶锦带;红王子锦带。

Study on Adaptability to Water Stress of Exotic Garden Tree Species in Baotou

The photosynthetic rate,stomatal conductance and water potential of fourteen exotic garden species in Baotou were measured.The results indicated that the net photosynthetic rate water potential compensation point and the water potential at the critical variety point of stomatal conductance could be considered as the adaptability indexes for trees to water stress.According to the net photosynthetic rate water potential compensation point,the water potential at the critical variety point of stomatal conductance and osmotic potential at the initial loss turgor,the tested species were classified as five kinds by cluster analysis.The drought resistance(from strong to weak) of the tested species was showed as follows: Spiraea×bumalda 'Gold Mound';Spiraea×bumalda 'Gold Flame',Ligustrum obtusifolium,Acer negundo 'Kellys Gold',Philadelphus coronaries 'Aurea';Physocarpus opulifolius 'Darts Gold',Prunus×cistena 'Pissardii',Acer negundo 'Aureo-marginatum',Acer negun do 'Variegatum';Sambucus racemosa 'Plumosa Aurea',Weigela florida 'Ziye',Caryopteris×clandonensis 'Worcester Gold',Weigela florida 'Variegata';Weigela florida 'Red Prince'.