The Effects Of Radiative Forcing On Photosynthetic Eco-physiology Of Three Typical Tree Species Seedlings In Subtropical

In recent years, with the development of industry and agriculture, artificial aerosol emissions have accelerated quickly, radiation forcing has had a huge impact on subtropical forest ecological system. Because of radiative forcing, the light factor and other ecological factor have changed the subtropical forest ecological environment. Therefore, through the studing of radiative forcing effects on the subtropical typical plant species, we can learn more about the subtropical forest adaptation mechanisms to radiative forcing, and the update, succession and recovery of the subtropical forest tropical hardwoodsIn this study, the subtropical typical tree seedlings (Castanopsis sclerophylla, Schima superb and Quercus glauca) are selected for experimental objects, using the method of artificial simulation radiative forcing environment, to study the ecological factors of the strong radiative forcing, weak radiative forcing and CK, and to study the three plant seedlings photosynthesis physiological changes, chlorophyll relative contents and Chlorophyll fluorescence,growth and and biomass allocation under the three conditions. The results showed that:(1) Radiative forcing changed the ecological factors. Radiative forcing reduced solar radiation, air temperature and soil temperature, and increased soil relative humidity and air relative humidity.(2) Radiative forcing had obvious effects on the the photosynthesis of the three kinds of plant seedlings. Under weak radiative forcing, the net photosynthetic rate of Schima superb was the lowest, while Castanopsis sclerophylla and Quercus glauca had the same performance under the radiative forcing, both were CK > weak radiative forcing> strong radiative forcing.(3) Radiative forcing had obvious effects on the relative chlorophyll content of the three kinds of plant seedlings, and adaption of the three plant seedlings were the same,all were strong radiative forcing > weak radiative forcing > CK. The chlorophyll fluorescence parameters (Fv/Fm, Fv/Fo) of the three kinds of plant seedlings all were increased in radiative forcing conditions. (4) Radiative forcing had different effects on the growth and biomass accumulation of the three kinds of plant seedlings. Under weak radiative forcing, the height growth of Schima superb had reduced significantly, while under strong radiative foring, the diameter growth of Castanopsis sclerophylla and Quercus glauca had reduced significantly Schima superba increased overall biomass under strong radiative forcing conditions, while radiative forcing reduced overall biomass of Castanopsis sclerophylla and Quercus glauca, the performance both were strong radiative forcing >weak radiation force >CK.