RabigulYASEN,WANG Shiwei,MA Bin,et al.Effects of Different Nitrogen Supply Levels on Photosynthetic Characteristics of Walnut Seedling Leaves[J].Northern Horticulture,2021,(16):56-61.[doi:10.11937/bfyy.20204623]
供氮水平对核桃幼苗叶片光合特性的影响
- Title:
- Effects of Different Nitrogen Supply Levels on Photosynthetic Characteristics of Walnut Seedling Leaves
- Keywords:
- nitrogen supply; walnut seedlings; photosynthesis
- 文献标志码:
- A
- 摘要:
- 以三年生‘温185’（Juglans regia ‘Wen185’）核桃幼苗为试材，通过盆栽的方法，研究了7种供氮（以NH4NO3计）水平下核桃幼苗光合特性的差异，以期明确核桃幼苗的最适供氮条件，为核桃幼苗对环境响应与适应机理方面的研究和指导高产核桃合理施肥提供参考依据。结果表明：各供氮处理核桃幼苗叶片的净光合速率（Pn）日变化、气孔导度（Gs）日变化及蒸腾速率（Tr）日变化均呈“升-降-升-降”的双峰曲线，具有明显的“午休”现象；随着供氮水平的增加，净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）值均是先升高后降低，均在8N水平下显著（P<0.05）达到最大值，但胞间CO2浓度（Ci）值随氮素浓度的增强反而减少。适当增加供氮水平可以显著提高核桃幼苗的光合能力，但过高或者过低的供氮条件反而不利于核桃幼苗的生长。综合来看，8N（8 mmol?L-1 NH4NO3）水平最适合核桃幼苗生长。
- Abstract:
- Three-year-old Juglans regia ‘Wen185’ walnut seedling was selected as the test material,through the pot experiments，the effects of photosynthetic characteristics of walnut seedlings at nitrogen supply (NH4NO3) levels were studied to figure out what optimum nitrogen supply condition of walnut seedling.In order to provide a reference for the study of environmental response and adaptation mechanism of walnut seedlings，and provide a scientific basis for guiding the rational fertilization of high-yield walnuts.The results showed that nitrogen supply walnut that diurnal variation of net photosynthetic rate (Pn)，stomatal conductance (Gs) and transpiration rate (Tr)of walnut seedling leaves treated with nitrogen all exhibited double curve of ‘ascending-descending-ascending-descending’ and there are significant ‘lunch break’ phenomenon；as the level of nitrogen supply increases the net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate (Tr) all exhibited it first increased and then decreased，both reaching the maximum at the level of 8N (P<0.05).However，the intercellular CO2 concentration (Ci) value decreased with the increase of nitrogen concentration.The photosynthetic capacity of walnut seedling could be improved by increasing nitrogen supply level，but too high or too low nitrogen supply strip was not conducive to the growth of walnut seedlings；in general，8N (8 mmol?L-1 NH4NO3) treatment was the most suitable for walnut seedling growth.
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备注/Memo
第一作者简介：热比古丽?亚森（1994-），女，硕士研究生，研究方向为林木栽培与生理。E-mail：1628262885@qq.com.责任作者：王世伟（1984-），男，博士，副教授，现主要从事林木栽培与生理等研究工作。E-mail：wsw8502041@163.com.基金项目：国家自然科学基金资助项目（31660548，32060361）；新疆农业大学大学生创新资助项目（dxscx2020348）;中央财政林草科技推广示范资助项目（新2019TG18）。收稿日期：2020-11-03