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ZHANG Tingyu, ZHANG Mingru, LI Qingxiang, ZHAO Nannan, WAN Qi, CAI Yihang. Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210771
Citation: ZHANG Tingyu, ZHANG Mingru, LI Qingxiang, ZHAO Nannan, WAN Qi, CAI Yihang. Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210771

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Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

doi: 10.11833/j.issn.2095-0756.20210771
  • Received Date: 2021-11-26
  • Accepted Date: 2022-03-29
  • Rev Recd Date: 2022-03-29
通讯作者: 陈斌, bchen63@163.com
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    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 treatments on photosynthetic characteristics of Stewartia sinensis seedlings

doi: 10.11833/j.issn.2095-0756.20210771

Abstract:   Objective  This study, with an investigation of the differences in the hotosynthetic hysiological and ecological adaptation of Stewartia sinensis seedlings to different light intensity and soil nitrogen content, is aimed to select combinations of light intensity and nitrogen treatment that are conducive to the cultivation of S. sinensis seedlings.   Method  With S. sinensis seedlings used as test materials, efforts were made to set four light intensity gradients, namely full light (L0), light light (44.79±0.51)% (L1), moderate light (19.60±0.23)% (L2), high light (7.25±0.10)% (L3), and three nitrogen application rates, i.e, low nitrogen 0.2 g·kg−1 (N1), high nitrogen 0.6 g·kg−1 (N2) and no nitrogen application (N0) before the light response process, photosynthetic pigment mass fraction and chlorophyll fluorescence parameters were recorded and measured upon 90d treatment.   Result   Light intensity, nitrogen and their interaction displayed significant effects on photosynthetic pigment and chlorophyll fluorescence of S. sinensis seedlings (P<0.05). Chl a/Chl b values of S. sinensis seedlings varied from 2.0 to 2.5, the LSP of S. sinensis seedlings varied from 571.3 to 931.4 μmol·m−2·s−1 whereas LCP varied from 4.8 to 26.0 μmol·m−2·s−1. With the increase of shading degree, the Chl, Car, Fo, Fm, AQY of S. sinensis seedlings tended to increase, the Chl a/Chl b and Car/Chl tended to decrease while the Pmax, Fv/Fo, Fv/Fm and PIABS increased first and then decreased. With the increase of nitrogen application rate, the PIABS of S. sinensis seedlings tended to increase, the Chl a/Chl b, Fo and Fm tended to decrease and the Chl, Car, Pmax and AQY increased first and then decreased; With L1 and L2 light intensity, Pn, Gs and Tr of S. sinensis seedlings were higher and Ci was lower and the application of low nitrogen significantly promoted Pn, Gs and Tr. The Pmax of L1N1 increased by 45.21% compared with L1N0 with the Pn and Pmax of L2N1 being the highest.   Conclusion  S. sinensis seedlings had the best photosynthetic capacity when grown with moderate shading and low nitrogen treatment whereas photosynthetic inhibition occurred with full light or high nitrogen treatment. [Ch, 1 fig. 6 tab. 34 ref.]

ZHANG Tingyu, ZHANG Mingru, LI Qingxiang, ZHAO Nannan, WAN Qi, CAI Yihang. Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210771
Citation: ZHANG Tingyu, ZHANG Mingru, LI Qingxiang, ZHAO Nannan, WAN Qi, CAI Yihang. Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20210771
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