摘要
采用人工模拟水分胁迫方法,对喀斯特地区1 a生构树苗木的生态耐旱适应性进行了研究。结果表明:随着水分胁迫加剧,构树幼苗叶质膜相对透性上升、丙二醛含量、游离脯氨酸含量增加;叶绿素含量、硝酸还原酶活性、根系活力下降;过氧化物酶活性呈"先上升后下降"的趋势。实验结果表明构树在一定的水分胁迫下能够主动调整其生理代谢,通过合成有机溶质以提高适应能力而忍受逆境,揭示喀斯特森林树种构树具有的一定生态耐旱生产潜力,对水分亏缺的适应能力也较强,可作为退化喀斯特石漠化地区造林的先锋树种。
By means of the artificial simulation method of water stress, the adaptability of ecological drought tolerance of one-year-old Broussonetia papyrifera seedlings was studied in Karst area. The results showed that with the aggravation of water stress, the permeability of membrane, the MDA and free praline accumulation of the seedlings increased, while chlorophyll content, root energy activity of NR decreased, and the POD activity increased firstly, then decreased. The experiments indicated tha B. patryrifera could avoid the injury of water stress by composing organic solutes to improve the ability to fit stress circumstance, which revealed the B. papyrifera of in Karst area had potential productivity of ecological drought tolerance and strong adaptability to water deficiency. It can be used as pioneer species of reforestation in degraded karst rocky desertification area.
出处
《西北林学院学报》
CSCD
北大核心
2010年第4期40-44,共5页
Journal of Northwest Forestry University
基金
国家"十一五"科技支撑计划项目(2006BAC01A09)
国家"十一五"科技支撑计划项目(2006BAD03A1006)
国家"973"重点基础研究发展规划资助项目(2006CB403206)
国家自然科学基金项目(10961008)
关键词
构树幼苗
水分胁迫
生理抗旱
生态适应性
Broussonetia papyrifera seedling physiological drought tolerance water stress ecological adaptability
