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| DOI：10.13522/j.cnki.ggps.2022676 |
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| Effect of Nitrogen Application on Photosynthetic Fluorescence Characteristics of Forage Oats |
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TIAN Yonglei, WANG Jing, MU Zongjie, ZHAO Yueping, CHANG Qing, BAI Chunli
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1. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China;
2. Ulanqab Forestry and Grassland Bureau, Ulanqab 012001, China;
3. Comprehensive Support and Technology Promotion Center of Zhurihe Town, Sunit Right Banner, Xilingol 026299, China
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| Abstract: |
| 【Objective】To investigate the change rule of photosynthetic fluorescence parameters of forage oats under different nitrogen levels, and to clarify the influence mechanism of nitrogen fertilization on the photosynthetic capacity of forage oats. 【Method】In this study, six nitrogen levels of 0, 150, 200, 250, 300 and 350 kg/hm2 were set in the Northern foothills of the Yinshan Mountains in Inner Mongolia, using forage oats as the material, to study the variation patterns of photochemical quenching coefficient (qP), non-photochemical quenching coefficient (NPQ), actual photochemical quantum yield, (Y(Ⅱ)), maximal photochemical efficiency (Fv/Fm) in leaves at different fertility stages under different nitrogen levels.【Result】With the increase of nitrogen application, the photosynthetic fluorescence parameters of forage oats Y(Ⅱ), Fv/Fm and qP all showed atrend of first increasing and then decreasing; NPQ showed the trend of decreasing and then increasing, and NPQ of N250 treatment was significantly lower than that of the other treatments (P＜0.05). With the advancement of fertility period, Y(Ⅱ) and Fv/Fm did not have obvious pattern of change, while qP and NPQ showed a trend of gradual increase.【Conclusion】A moderate increase in the amount of nitrogen helps to maintain the stability of PS II reaction center system and improve the photosynthetic capacity of forage oats; the appropriate amount of nitrogen fertilizer for growing forage oats in the Northern foothills of the Yinshan Mountains is 250 kg/hm2. |
| Key words: forage oats; nitrogen; photosynthetic fluorescence properties |
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