Effects of soil nitrogen addition on photosynthesis of hybrid Broussonetia papyrifera in subtropical red soil area

doi:10.7523/j.ucas.2021.0018

Abstract

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

CLC Number:

Q945.11

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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