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林业科学 ›› 2010, Vol. 46 ›› Issue (6): 51-57.doi: 10.11707/j.1001-7488.20100608

• 论文 • 上一篇    下一篇

外源Ca2+ 对南林895杨扦插苗生长及稳定同位素δ13 C,δ15 N动态分布的影响

王雷,尹增芳,尤禄祥,李建银,于明祥,徐棉芬   

  1. 南京林业大学森林与环境学院 南京 210037
  • 收稿日期:2009-03-23 修回日期:2009-11-07 出版日期:2010-06-25 发布日期:2010-06-25
  • 通讯作者: 尹增芳

Effects of Exogenous Ca2+ on Growth and Dynamic Distribution of Stable Isotope δ13 C,δ15 N of Populus×euramericana‘Nanlin 895' Cuttings

Wang Lei;Yin Zengfang;You Luxiang;Li Janyin;Yu Mingxiang;Xu Mianfen   

  1. College of Forest Resources and Environment,Nanjing Forestry UniversityNanjing 210037
  • Received:2009-03-23 Revised:2009-11-07 Online:2010-06-25 Published:2010-06-25

摘要:

利用形态检测与稳定同位素技术,分析不同质量浓度外源Ca2+ (CaCl2 ) 处理下,南林895杨扦插苗株高、地径、生物量的变化情况以及各营养器官δ13 C,δ15 N值的动态变化。结果表明:不同质量浓度的外源Ca2+ 均能不同程度地促进苗木的生长。外源喷施Ca2+ 后,扦插苗株高、地径、生物量均优于对照,其中以200 mg·L-1 质量浓度的Ca2+ 处理效果最好,其单株平均株高、地径、生物量分别比对照增加14.82%,18.01%,19.7%。随着Ca2+ 质量浓度(0,2,20,100,200,300 mg·L-1 )的升高,南林895苗木叶、茎、根中δ13 C,δ15 N值均呈现逐渐上升然后缓慢下降的趋势,且最大值出现在Ca2+ 质量浓度为200 mg·L-1 处。δ13 C,δ15 N值在植株中的分布遵从“库”器官大于“源”器官的规律。相关性分析表明:“源”器官δ13 C,δ15 N值与株高、地径呈显著性负相关,与生物量呈正相关; “库”器官δ13 C,δ15 N值与株高、地径、生物量均呈显著正相关。不同营养器官δ13 C,δ15 N值的动态变化在一定程度上可以反映南林895杨扦插苗“源”“库”器官间光合同化物积累与再分配格局对外源Ca2+ 质量浓度的响应。

关键词: 南林895杨, 外源Ca2+, 生物量, &delta, 13 C, &delta, 15 N

Abstract:

In this paper,growth in height,caliper,and biomass,and dynamic changes of the δ13 C and δ15 N value in the vegetative organs of Populus ×euramericana‘Nanlin 895' cuttings were investigated in response to different concentrations of exogenous Ca2+ treatments.The experimental results showed that different concentrations of exogenous Ca2+ were able to promote the plant growth;the height,caliper,and biomass increments were all greater than the control after spraying exogenous Ca2+ ,among which the 200 mg·L-1 Ca2+ concentration exhibited the best effect.Compared with the control,the average of the height,caliper and biomass treated with 200 mg·L-1 Ca2+ increased by 14.82%,18.01%,and 19.7% respectively.The stable isotope,δ13 C and δ15 N,enrichment capacity of the Populus×euramericana ‘Nanlin 895' cuttings were affected by different concentration exogenous Ca2+ to various degrees.With the Ca2+ concentration increased (0,2,20,100,200,300 mg·L-1 ),the δ13 C and δ15 N values of the leaf,stem and root presented a gradual increase at low concentrations,and then slowly declined at high concentration,with the maximum value appeared at the concentration of 200 mg·L-1 Ca2+ .The distribution of δ13 C and δ15 N value in the plant complied with the principle that the “sink” organ was more than the “source” organ.The correlation analysis showed that both the δ13 C and δ15 N values of  “source”  organ had a significantly negative correlation with the height,caliper,and the positive correlation with biomass.The δ13 C,δ15 N value of  “sink”  organ had a significantly positive correlation with the plant height,caliper,and biomass.The δ13 C,δ15 N value dynamic changes of different vegetative organs reflected to a certain extent accumulation and redistribution patterns of the photoassimilates in the “source” and “sink” organs of Populus ×euramericana ‘Nanlin 895' cuttings in response to exogenous Ca2+ concentration.

Key words: Populus×, euramericana&lsquo, Nanlin 895', exogenous Ca2+, biomass, &delta, 13 C, &delta, 15 N