Simulation on photosynthetic light-responses of leaves of Quercus variabilis and Robinia pseudoacacia under different light conditions.

• Published in: Ying yong sheng tai xue bao Vol. 29; no. 7; p. 2295
• Main Authors: Li, Li Yuan, Li, Jun, Tong, Xiao Juan, Meng, Ping, Zhang, Jin Song, Zhang, Jing Ru
• Format: Journal Article
• Language: Chinese
• Published: China 01.07.2018
• Subjects: Quercus variabilis; gas exchange parameter; photosynthetic parameter; light condition; Robinia pseudoacacia
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.201807.029

Photosynthesis can reflect the responses of plants to environmental changes. In this study, photosynthetic light-response curves were measured by the Li-6400XT photosynthetic system in Quercus variabilis and Robinia pseudoacacia plantations in Xiaolangdi Forest Ecosystem Research Station. Photosynthetic light-response curves were fitted by Ye model. The differences of photosynthetic parameters between inner and margin forests were examined. Stomatal conductance (g ) light-response curve were fitted using the mechanism model of g coupled with a modified model of light-response of photosynthesis. The light-response characteristics of g were investigated. Net photosynthetic rates (P ) of Q. variabilis in the inner forest was higher than that in the margin. The initial light efficiency (Α) was 12.4% more in the inner forest than that in the margin in July and August when photosynthetically active radiation was less than 200 Μmol·m ·s . The ability to capture and utilize weak light of Q. variabilis leaves in the i