亚热带红壤区土壤氮添加对杂交构树 光合作用的影响

doi:10.7523/j.ucas.2021.0018

摘要/Abstract

摘要： 土壤含氮量和光照条件是影响植物光合作用的重要因子。为了定量化亚热带红壤区杂交构树光合作用和光响应与土壤氮添加量的关系，采用Li-6400光合测定仪等设备，测定中国科学院江西省千烟洲试验站土壤氮添加量梯度条件下的杂交构树光合过程，并利用修正直角双曲线模型对净光合速率的光响应曲线进行拟合。结果表明：杂交构树光补偿点和光饱和点分别为24.2和1 147.6 μmol·m^-2·s^-1，有较强的光环境适应能力，在800~1 200 μmol·m^-2·s^-1的光照强度下，杂交构树均能保持较高的光合效率；添加含氮46%的尿素22.5 kg/ha，可促使杂交构树叶片中叶绿素相对含量增加12.8%，净光合速率提升66.8%；土壤氮素添加能明显改变最大光化学效率、实际光化学效率、表观光合电子传递速率等叶绿素荧光参数，但对光化学猝灭参数和非光化学猝灭参数无显著影响。

关键词: 杂交构树, 光响应曲线, 气体交换参数, 叶绿素荧光参数, 叶绿素相对含量

Abstract: Soil nitrogen content and light conditions are important factors affecting plant photosynthesis. In order to quantify the relationship of soil nitrogen addition with photosynthesis and light response of hybrid Broussonetia papyrifera in subtropical red soil area, Li-6400 photosynthesis tester and other equipment were used to determine the photosynthetic process of hybrid Broussonetia papyrifera under the condition of soil nitrogen addition gradient at Qianyanzhou Experimental Station of Jiangxi Province, Chinese Academy of Sciences, and the light response curve of net photosynthetic rate was fitted by using the modified right-angle hyperbolic model. The results showed that: The light compensation point and light saturation point of hybrid Broussonetia papyrifera were 24.2 and 1 147.6 μmol·m^-2·s^-1, respectively, with strong adaptability to light environment. Hybrid Broussonetia papyrifera could maintain high photosynthetic efficiency at the light intensity of 800-1 200 μmol·m^-2·s^-1. Besides, adding 22.5 kg/ha of urea containing 46% nitrogen could increase the relative content of chlorophyll in hybrid Broussonetia papyrifera leaves by 12.8%, net photosynthetic rate by 66.8%. Soil nitrogen addition could significantly change chlorophyll fluorescence parameters such as maximum photochemical efficiency, actual photochemical efficiency, and apparent photosynthetic electron transfer rate, but it had no significant effect on photochemical quenching parameters and non-photochemical quenching parameters.

Key words: hybrid Broussonetia papyrifera, light response curve, gas exchange parameters, chlorophyll fluorescence parameters, relative chlorophyll content

中图分类号:

Q945.11

刘铭, 王景升. 亚热带红壤区土壤氮添加对杂交构树光合作用的影响[J]. 中国科学院大学学报, 2022, 39(6): 732-741.

LIU Ming, WANG Jingsheng. Effects of soil nitrogen addition on photosynthesis of hybrid Broussonetia papyrifera in subtropical red soil area[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(6): 732-741.

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