欢迎访问《应用生态学报》官方网站,今天是 分享到:

应用生态学报 ›› 2000, Vol. ›› Issue (5): 665-667.

• 研究论文 • 上一篇    下一篇

不同形态N素对水曲柳幼苗生长的影响

张彦东1, 范志强2, 王庆成2, 王政权2   

  1. 1. 中国科学院西双版纳热带植物园, 昆明650223;
    2. 东北林业大学森林资源与环境学院, 哈尔滨150040
  • 收稿日期:2000-03-06 修回日期:2000-05-11 出版日期:2000-09-25
  • 通讯作者: 张彦东,男,1963年4月生,博士,副研究员,主要研究领域为森林培育与林地营养管理,发表论文30余篇.E-mail:Wzqsilv@public.hr.hl.cn
  • 基金资助:
    国家”九五”科技攻关项目(96-011-02-01)

Effect of different nitrogen forms on growth of Fraxinus mandshurica seedlings

ZHANG Y1, ong2, FAN Zhiqiang2, WANG Qingcheng2   

  1. 1. Xishuangbanna Tropical Botanic Garden, Chinese Academy of Sciences, Kunming 650223;
    2. School of Forest Resource and Environment, Northeast Forestry University, Harbin 150040
  • Received:2000-03-06 Revised:2000-05-11 Online:2000-09-25

摘要: 在温室内用砂培的方法研究了NO3--N、NH4+-N及其不同配比对水曲柳(Fraxinus mandshurica)幼苗生长的影响.结果表明,水曲柳幼苗在营养液NO3--N◇NH4+-N为75◇25时生长最好,营养液中NH4+-N比例继续增加则生长下降.过量的NH4+-N可抑制水曲柳幼苗根系生长,降低幼苗的地下/地上比.营养液中NH4+-N比例增加,水曲柳幼苗的净光合速率下降,体内P浓度增高,而Zn和Fe浓度下降.N素形态明显影响基质的pH值,NO3--N比例增加使基质pH值升高,NH4+-N比例增加则基质pH值下降.完全供给NO3--N时基质pH值升至7.22,而完全供给NH4+-N时基质的pH值降至4.20.

Abstract: The effect of NO3--N and NH4+-N and their different supply ratios on the growth of Fraxinus mandshurica seedlings was studied by sand culture in greenhouse.The highest seedling growth was obtained at a NH3--N/NH4+-N ratio of 75/25 in nutrient solution.The growth of seedlings declined with the increasing ratio of NH4+-N to NO3--N. Excessive NH4+-N inhibited root growth,and the root/shoot ratio of the seedlings significantly decreased as the NH4+-N/NO3--N ratio was over 50%.Increasing NH4+-N in nutrient solution led to the decrease of net photosynthetic rate,the increase of phosphorus content in plant tissues,and the decrease of Zn and Fe contents.The pH value of cultural medium was affected markedly by nitrogen form,which was increased with increasing NO3--N and decreased with increasing NH4+-N in nutrient solution.The pH value was up to 7.22 in the medium contained NO3--N alone,while decreased tO4.20 only with NH4+-N.