Abstract: In a culture experiment, the effects of different concentration 2,6-bis (1,1-dimethylethyl) phenol and 1,2-benzodicarboxylic dimethyl ester on the photosynthesis and chlorophyll fluorescence characteristics of eggplant seedlings were studied, and the results showed that these two allelochemicals were the barriers of chlorophyll content, net photosynthetic rate(P_n), and stomatal conductance(G_s). The intercellular CO₂ concentration(C_i) decreased in the former period, and then increased. The allelochemicals increased initial fluorescence(F_o), but decreased maximum photochemical efficiency of PSⅡ(F_v/F_m), quantum efficiency of non-cyclic electron transport of PSⅡ(Ф_PSⅡ), photochemical quenching ((q_P) and antenna conversion efficiency (F_v′/F_m′). 2,6-bis (1,1-dimethylethyl) phenol made non-photochemical quenching (q_N) increase first and decrease then, while 1,2-benzodicarboxylic dimethyl ester decreased q_N, which was harmful to the photosynthesis structure.

Key words: Agro ecoclimatic resources, Quantitative analysis, Classified evaluation, Gansu province