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淹水胁迫下枫香叶片对富氮水平的光合响应
苏守香,彭镇华,孙启祥,方建民,徐凯
0
(国际竹藤中心,中国林业科学研究院林业研究所,国家林业局林木培育重点实验室;安徽省林业科学研究院;浙江农林大学农业与食品科学学院)
摘要:
研究了不同富氮水平(16、6、0.5和0 mg?kg-1)没顶全淹、冠层半淹和根部渍水对枫香叶片光合作用的影响。结果表明,淹水下枫香叶片的净光合速率(Pn)显著下降,但较高富氮水平(16和6 mg?kg-1)淹水胁迫下枫香叶片净光合速率的下降幅度明显低于低富氮水平(0.5 mg?kg-1)、零富氮水平(0 mg?kg-1)和对照。淹水胁迫下,枫香叶片的非光化学淬灭系数(qN或NPQ)随富氮水平的提高而降低,而光化学淬灭系数(qP)则相反。不同富氮水平淹水胁迫下,枫香叶片的最大光化学效率(Fv/Fm)均出现不同程度下降,淹水1~30 d各富氮处理间的Fv/Fm差异均不显著,但淹水40 d,各处理间的Fv/Fm下降幅度明显增大,而且较高富氮水平(16和6 mg?kg-1)枫香叶片净光合速率的下降幅度明显低于低富氮水平(0.5 mg?kg-1)、零富氮水平(0 mg?kg-1)和对照。上述试验结果说明,富氮可缓解淹水对枫香叶片光合作用的胁迫损害,枫香在富营养的湿地环境中适应性更强,可作为滩地造林和湿地绿化的首选树种。
关键词:  枫香  淹水  富氮  光合作用
DOI:
基金项目:“十二五”国家科技支撑计划项目(2011BAD38B07)
Photosynthetic response to nitrogen levels under flooding stressof Liquidambar formosana Hance. leaves
SU Shou-xiang,PENG Zhen-hua,SUN Qi-xiang,FANG Jian-min,XU Kai
(International Center for Bamboo and Rattan,Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration;Anhui Academy of Forestry;School of Agricultural and Food Science, Zhejiang A & F University)
Abstract:
The effects of different rich nitrogen levels (16, 6, 0.5, 0 mg?kg-1) on photosynthesis of Liquidambar formosana Hance. under fully flooded, canopy semi-submerged and roots waterlogging were studied. The results show that the net photosynthetic rate (Pn) in leaves of L. formosana decreased significantly under flooding, but the declining degree of Pn in leaves of L. formosana treated with higher nitrogen levels (16,6 mg?kg-1) was clearly smaller than that with low nitrogen levels (0.5 mg?kg-1), zero nitrogen level (0 mg?kg-1) and the control. Under flooding stress, non-photochemical quenching parameters (qN or NPQ) decreased with the increase of rich nitrogen level, while photochemical quenching parameters (qP) was the opposite. Under flooding stress with different levels of nitrogen, all the maximum photochemical efficiencies decreased in leaves of L. formosana, however, the differences between two maximum photochemical efficiencies were not dramatic in flooding from day one to day thirty, but they increased clearly after flooding for 40 days, and declining degree of the maximum photochemical efficiencies in leaves of L. formosana with higher nitrogen levels (16, 6 mg?kg-1) was clearly smaller than that with low nitrogen levels (0.5 mg?kg-1), zero nitrogen level (0 mg?kg-1) and the control. The experiment results reveal that rich nitrogen can buffer the stress damage of flooding to photosynthesis in leaves of L. formosana, indicating the L.formosana has stronger adaptability in eutrophic wetland environment, and can be used as a suitable species for afforestation on tidal flat and greening of wetland.
Key words:  Liquidambar formosana Hance.  flooding  rich nitrogen  photosynthesis

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