欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2014, Vol. 23 ›› Issue (1): 185-191.DOI: 10.11686/cyxb20140122

• 研究论文 • 上一篇    下一篇

沙埋对两种灌木生长影响及其生理响应差异

赵哈林1,曲浩1,周瑞莲2,云建英1,李瑾1,王进2   

  1. 1.中国科学院寒区旱区环境与工程研究所,甘肃兰州730000
    2.鲁东大学生命学院,山东烟台264025
  • 收稿日期:2013-02-22 出版日期:2014-02-20 发布日期:2014-02-20
  • 作者简介:赵哈林(1954-),男,安徽马鞍山人,研究员。E-mail:resdiv@lzb.ac.cn
  • 基金资助:
    国家自然科学基金课题(31270752,30972422)和国家科技支撑项目(2011BACO7B02)资助

Effects of sand burial on growth of two shrub species and their differences in physiological responses

ZHAO Ha-lin1,QU Hao1,ZHOU Rui-lian2,YUN Jian-ying1,LI Jin1,WANG Jin2   

  1. 1.Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou 730000,China;
    2.Faculty of Life Sciences,Ludong University,Yantai 264025,China
  • Received:2013-02-22 Online:2014-02-20 Published:2014-02-20

摘要: 差巴嘎蒿属于沙生半灌木,小叶锦鸡儿属于非沙生灌木,二者均为内蒙古东部几个沙地中分布最广的灌木种。为比较两种灌木耐沙埋能力及其生理响应差异,2010-2011年在内蒙古科尔沁沙地研究了不同深度沙埋处理下两种灌木幼苗的存活率、株高、渗透调节物质含量、保护酶活性和膜透性变化。结果表明, 1)差巴嘎蒿较小叶锦鸡儿具有更强的耐沙埋能力,前者在沙埋深度达到株高200%时仍有部分幼苗存活,后者在沙埋深度为其株高100%时即已全部死亡;2)沙埋深度为株高25%时,两种灌木高生长均未受到明显影响,当沙埋深度达到株高50%时,两种灌木的高生长均受到抑制;3)当沙埋深度由株高25%增至75%以后,差巴嘎蒿没有显示出水分胁迫,其MDA含量下降,膜透性没有明显变化,而小叶锦鸡儿在沙埋深度为株高50%时即已显示出水分胁迫,MDA含量明显增加,但膜透性没有发生明显变化;4)沙埋深度为株高75%~100%时,差巴嘎蒿有两种酶活性显著增强,起到了共同防止膜质过氧化作用,而小叶锦鸡儿只有一种酶活性显著增强;5)沙埋胁迫下,差巴嘎蒿脯氨酸发挥了一定渗透调节作用,小叶锦鸡儿的脯氨酸和可溶性糖均未有效发挥渗透调节作用;6)差巴嘎蒿之所以具有较强的耐沙埋能力,一个重要原因是沙埋后其保护酶活性和渗透调节物质含量增加幅度大,有效地减轻了细胞膜损伤。

Abstract: Artemisia halodendron is a psammophytic half shrub while Caragana microphylla is an un-psammophytic shrub. They are both widely distributed shrub species in sand land of eastern Inner Mongolia. The changes of survival rate,plant height,osmotic regulation substances,protective enzymes and membrane permeability in different sand burial depths were studied during 2010-2011 in the Horqin Sand Land of Inner Mongolia to compare tolerance to sand burial and differences in physiological responses of the two species. 1) A. halodendron had a stronger ability to resist sand burial compared with C. microphylla. Plants of the former survived sand burial to a depth of twice seedling height,but the latter all died with burial to seedling height. 2) Height growth of the two species were not significantly reduced when the burial depth was 25% seedling height but was inhibited at burial to 50% seedling height. 3) When the depth of sand burial was 25% to 75% seedling height,A. halodendron showed no water stress,there was no obvious change,in membrane permeability but the MDA content decreased. C. microphylla buried to a depth of 50% showed no water stress,MDA content increased,but there was no significant changes in membrane permeability. 4) Sand burial to depths of 75%-100%,significantly enhanced activities of two kinds of enzymes which prevented membrane lipid peroxidation in A. halodendron,but only one enzyme activity was significantly enhanced in C. microphylla; 5) In sand burial stress,proline played an important role in osmotic adjustment for A. halodendron,but proline and soluble sugar did not effectively affect osmotic adjustment in C. microphylla;6) The stronger ability of A. halodendron to withstand sand burial was mainly attributed to significant increases of protective enzyme activity and osmotic regulatory substance contents which effectively relieved cell membrane damage when subjected to sand burial stress.

中图分类号: