【摘要】 在盆栽条件下研究了不同土壤水分条件下黄土高原2个乡土树种辽东栎(Quercusliaotungensis)和大叶细裂槭(Acerstenolobumvar.megalophyllum)的水分状况。结果表明,随干旱胁迫程度加剧,2树种叶水势均下降,随胁迫时间延长水势有回升趋势,显示出树种自身的调节能力,大叶细裂槭调节水势的能力强于辽东栎。在不同水分处理下2树种蒸腾日进程差异明显。不同天气状况对树种蒸腾及耗水日变化的影响亦不相同。辽东栎属低蒸腾速率高耗水树种,由于其蒸腾面积大,叶保水力低,只适于生长在水分较充足的地区;而大叶细裂槭属低耗水的树种,在水分条件较差时生长基本良好,可见其适应性强于辽东栎。更多还原

【Abstract】 Water status of two native tree species on the Loess plateau was studied under different soil water contents. Results showed that leaf water potential of the species decreased with drought stress and began to ascend with the stress extended, this revealed that the selfregulation capacity of Acer stenolobum var. megalophyllum was higher than that of Quercus liaotungensis. Leaf water potential was related to leaf water content and it decided the leaf water status. Transpiration rate and resumed water of the species were significantly different on Sunday and cloudy day under different water stress. Q. liaotungensis had characteristics of high transpiration rate and high consumption water because of its large transpiration area and low retained water capacity .This result showed it fitted better water condition. A. stenolobum var. megalophyllum had characteristis of high transpiration rate and low consumption water and fitted medium and serious water stress. Especially it could live under serious water stress and had higher survival rate than Q. liaotungensis. Also its survival rate could get to 100 %. This result showed A. stenolobum var. megalophyllum had higher adaptability than Q. liaotungensis.更多还原