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夜间人工照明对两种常见城市杂草光合特性及生长的影响
黄莉,王欣宇,陈斌
0
(南京林业大学南方现代林业协同创新中心,南京林业大学生物与环境学院,南京 210037)
摘要:
为明晰城市夜间人工照明对于植物光合作用特征和生长表现的调控作用,以典型城市杂草牛筋草和蒲公英为对象,研究在夜间灯光(光合有效辐射约为1 μmol·m-2·s-1的路灯落地面光强水平)和无夜间灯光两种处理条件下植物的光合生理和生物量积累。结果表明:(1)牛筋草和蒲公英叶片在夜间低水平光照条件下仍可进行光合作用。此外,夜间灯光对牛筋草叶片的夜间胞间CO2浓度、蒸腾速率和气孔导度具有抑制作用,而对蒲公英的相应指标无影响。(2)夜间灯光可显著抑制牛筋草叶片的白天净光合速率,显著抑制蒲公英叶片的白天胞间CO2浓度。(3)总体而言,夜间灯光对牛筋草的生物量积累无显著影响,但能显著增加蒲公英的地上生物量和总生物量水平。研究结果表明夜间人工照明可通过调节植物的昼、夜光合特征影响植物的生长速率,且植物对夜间光照的响应具有种间差异性。
关键词:  夜间灯光  牛筋草  蒲公英  光合特性  生长
DOI:10.13610/j.cnki.1672-352x.20220106.014
投稿时间:2021-03-17
基金项目:国家自然科学基金项目(32071526)和江苏省高校优势学科建设工程项目(PAPD)资助。
Effects of artificial lighting at night on the photosynthesis and growth of two typical urban weed species
HUANG Li,WANG Xinyu,CHEN Bin
(Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037)
Abstract:
To investigate the effects of urban artificial lighting at night (ALAN) on the photosynthesis and growth of plants, we conducted a controlled experiment that two typical urban weed species Eleusine indica and Taraxacum mongolicum grew under nighttime lighting (NL, with PAR around 1 μmol·m-2·s-1 to simulate the ground-level light intensity of street lamps) and no nighttime lighting (CK) conditions, and measured their photosynthetic parameters and biomass. The results showed that: (1) Both E. indica and T. mongolicum can photosynthesize under low-light NL treatment at night. Meanwhile, NL significantly reduced the nighttime intercellular CO2 concentration, transpiration rate and stomata conductance of E. indica, but it had no effects on those parameters of T. mongolicum. (2) NL treatment significantly reduced the daytime photosynthetic activity of E. indica and significantly reduced the daytime intercellular CO2 concentration of T. mongolicum. (3) Overall, NL treatment had no effect on the biomass production of E. indica, while it significantly increased the shoot mass and total mass of T. mongolicum. The results suggested that ALAN can influence the growth of plants via its effects on both day- and night-time photosynthesis of plants, and the responses of plants to ALAN are highly species-specific.
Key words:  ALAN  Eleusine indica  Taraxacum mongolicum  photosynthesis  growth

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