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ZHAO Nannan, WAN Qi, ZHANG Mingru, LI Qingxiang, ZHANG Tingyu, CAI Yihang. Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210605
Citation: ZHAO Nannan, WAN Qi, ZHANG Mingru, LI Qingxiang, ZHANG Tingyu, CAI Yihang. Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210605

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Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings

doi: 10.11833/j.issn.2095-0756.20210605
  • Received Date: 2021-09-01
  • Accepted Date: 2022-03-04
  • Rev Recd Date: 2022-02-28
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings

doi: 10.11833/j.issn.2095-0756.20210605

Abstract:   Objective   This study aims to screen the combination treatment of light intensity and nitrogen application that is more conducive to the expression of photosynthetic physiological parameters, so as to reveal the relationship between the changes of light intensity and nitrogen and the growth of Styrax obassia seedlings.  Method   Potted seedling cultivation method was adopted to construct the two-factor control test of light and nitrogen. Four shading treatments were prepared: all-light control with 100.00% transmittance, light shading with 47.30% transmittance (L1), moderate shading with 20.00% (L2) and high shading 7.75% (L3). Three nitrogen application treatments were included: N2 (0.63 g pure nitrogen), N1 (0.21 g pure nitrogen) and N0 (no nitrogen application). The light response process and the variation characteristics of photosynthetic pigment content were determined and analyzed.   Result   (1)With the increase of shading degree and nitrogen application rate, net photosynthetic rate (Pn), apparent quantum efficiency (AQY) and total chlorophyll (Chl) content of S. obassia seedlings increased, while dark respiration rate (Rd) decreased, and light saturation point (LSP) ranged from 140.00 to 481.33 μmol·m−2·s−1. Light compensation point (LCP) varied from 6.00 to 34.67 μmol·m−2·s−1, and the ratio of Chl a to Chl b was less than 2. (2) Under all light and L1 shading+N2 treatment, the plants died. (3) Under L1 shading, the change of Pn ranging from large to small was N1, N0, and N2. Under L3 shading, when photosynthetic effective radiation (PAR)was greater than 400 μmol·m−2·s−1, the Pn of N2 was significantly higher than that of N0 and N1 (P<0.05). (4) Both light intensity and nitrogen application had significant effects on photosynthetic pigment content (P<0.01), and the influence trend in descending order was light, nitrogen, and light+nitrogen.   Conclusion  The seedlings of S. obassia have strong shade tolerance, and the optimal combination treatment of light and nitrogen is L3+N2. [Ch, 1 fig. 3 tab. 26 ref.]

ZHAO Nannan, WAN Qi, ZHANG Mingru, LI Qingxiang, ZHANG Tingyu, CAI Yihang. Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210605
Citation: ZHAO Nannan, WAN Qi, ZHANG Mingru, LI Qingxiang, ZHANG Tingyu, CAI Yihang. Effects of light intensity and nitrogen application on photosynthetic physiological parameters of Styrax obassia seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210605
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