土壤水分胁迫下不同赤皮青冈种源生理特性的研究.PDF

第34 卷 第2 期 中 南 林 业 科 技 大 学 学 报 Vol. 34 No. 2 2014 年2 月 Journal of Central South University of Forestry Technology Feb. 2014 土壤水分胁迫下不同赤皮青冈种源生理特性的研究 吴丽君，李志辉，戴 玲，田超华，卢江泽 （中南林业科技大学林学院，湖南长沙4 10004 ） 摘 要：以浙江庆元、湖南永定和湖南靖县 3 个种源的赤皮青冈 1 年生实生幼苗为试验材料，研究了土壤水分 胁迫对不同赤皮青冈种源生理特性的影响，结果表明：水分胁迫 50 d 后，随着水分胁迫程度的加强，各供试种 源的叶绿素 a （Chla ）含量表现为先上升后下降的趋势；叶绿素b （Chlb ）含量表现为下降的趋势；丙二醛 （MDA ） 含量表现为增加的趋势；过氧化物酶 （POD ）活性变化规律种源之间有差异，浙江庆元种源和湖南永定种源 POD 活性呈现出先升高后降低的趋势，而湖南靖县种源呈现出下降的趋势。浙江庆元种源在土壤相对含水量为 60%，且胁迫时间小于 30 d 时，各项生理指标均显著优于其他处理。推测各种源之间抗旱性存在较大差异，3 个 供试赤皮青冈种源的抗旱能力大小依次为：湖南永定＞浙江庆元＞湖南靖县。 关键词：赤皮青冈；土壤水分胁迫；种源生理特性 +2.3 文献标志码：A 文章编号：1673-923X(2014)02-0012-04 中图分类号：S718.51 Effects of soil water stress on physiological characteristics of different Cyclobalanopsis gilva varieties WU Li-jun, LI Zhi-hui, DAI Ling, TIAN Chao-hua, LU Jiang-ze (College of Forestry, Central South University of Forestry and Technology, Changsha 410004, Hunan, China) Abstract: By taking one-year-old seedlings of Cyclobalanopsis gilva as the tested material ，the effects of soil water stress on physiological characteristics in different C. gilva varieties have been studied. The results indicate that under water stress for 50 days， the chlorophyll A contents in all species increased at the initial stage then decreased slowly ，while chlorophyll B contents showed a declining trend and MDA contents were increasing as the water stress continued; POD activities in Zhej iang and Yongding varieties firstly increased then dropped, but Huaihua variety was continuously dropping with the strengthening of water stress after 50 days; when the relative soil water