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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (2): 207-217.doi: 10.7525/j.issn.1673-5102.2023.02.006

• Physiology and Ecology • Previous Articles     Next Articles

Different Nitrogen Forms on the Photosynthetic Characteristics and Growth of Fraxinus mandshurica and Quercus mongolica

Tingting LI, Liu YANG, Xiaoxia LI, Yisong WANG, Xiuwei WANG()   

  1. School of Forestry,Northeast Forestry University,Harbin 150040
  • Received:2022-09-01 Online:2023-03-20 Published:2023-03-07
  • Contact: Xiuwei WANG E-mail:wxgreat@nefu.edu.cn
  • About author:LI Tingting(1993—),female,postgraduate,major in plant ecophysiology.
  • Supported by:
    National Key Research and Development Program Project(2021YFD1500705);Heilongjiang Province Applied Technology Research and Development Program(GA20B401)


To explore the differences in the effects of on the growth and photosynthetic characteristics of tree seedlings, and their adaptation strategies to different nitrogen forms, the one-year seedlings of Fraxinus mandshurica and Quercus mongolica were used as materials, and three nitrogen fertilizer forms were applied: nitrate N, ammonium N and organic N. Two-way ANOVA was used to analysis the effect and interaction of nitrogen form and tree species on the growth and photosynthetic. Spearman rank correlation was used to analysis the correlation between growth index and photosynthetic index. The results were as follows, the effects of nitrogen form treatments, tree species and their interactions on the growth and physiological indexes of seedlings were significant(P<0.05) respectively. Photosynthesis rate and growth were significantly different between the two tree species in nitrogen forms(P<0.05). The organic N treatment group was more beneficial to the growth of Q. mongolica, than the control group and other nitrogen form treatment groups; the growth indexes of F. mandshurica in the three nitrogen forms treatment groups were significantly higher than those in the control group(P<0.05), but there was no significant difference in the growth indexes of F. mandshurica between the nitrogen form treatments(P>0.05). Through the correlation analysis of the growth and physiological indicators of F. mandshurica and Q. mongolica, there was a significant positive correlation between the photosynthetic indexes of F. mandshurica, but the correlation between photosynthetic indexes and leaf nitrogen content was not significant(P>0.05). The growth amount was significantly positively correlated with the light compensation point, light saturation points and dark respiration rate(P<0.05); the maximum net photosynthetic rate of Q. mongolica was significantly positively correlated with the stomatal conductance(P<0.01). The correlation between other photosynthetic indexes was not significant (P>0.05), the maximum net photosynthetic rate was significantly positively correlated with leaf nitrogen content(P<0.001), and high growth was negatively correlated with the maximum net photosynthetic rate and stomatal conductance relationship(P<0.01 and P<0.05). Nitrogen forms and tree species and their interaction have significant effects on seedling growth and photosynthetic characteristics. Different tree species have different response strategies under different nitrogen forms. The organic nitrogen is more conducive to the growth of Q. mongolica, but nitrate nitrogen has a more obvious effect on the growth of F. mandshurica. The result of this study provides reference for the cultivation of appropriate nitrogen fertilizer in Northeast China.

Key words: nitrogen form, plant height, ground diameter, photosynthesis, leaf nitrogen content

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