Analysis of Differences in Drought Resistance of Schima superba Under Mycorrhizal Inoculation and Nitrogen Fertilizer Treatment
To achieve scientific afforestation of Schima superba and improve its drought resistance,mycorrhizal inoculation and nitrogen application methods were used to explore the physiological changes in the growth of Schima superba seedlings under drought stress.The results showed as follows:compared with the normal 75％soil moisture content,under the con-dition of 40％soil moisture content,seedlings suffered from significant drought stress,with a significant decrease in seedling height(H)and ground diameter(D)increment,a increase in leaf chlorophyll content(CP),net photosynthetic rate(Pn),water use efficiency(WUE),intercellular carbon dioxide concentration(Ci),an increase in transpiration rate(Tr)and stom-atal conductance(Gs);and a relative water deficit rate(RWD)malondialdehyde(MDA)increased,SOD activity and solu-ble sugar(SS)and free proline(Pro)content decreased.Compared with single mycorrhizal inoculation and nitrogen appli-cation treatment,the composite treatment of mycorrhizal inoculation and nitrogen application resulted in the highest height diameter growth of seedlings,as well as the highest Pn and WUE.The effect of single mycorrhizal inoculation and nitrogen application was affected by soil moisture content,under normal water conditions,the height diameter increment,CP,and Pn of nitrogen treated seedlings were greater than those of mycorrhizal treatment.However,under drought stress,the CP,Tr,Gs,andRWD of mycorrhizal treated seedlings were lower than those of nitrogen treatment,and the activities of Ci and SOD,and the contents of SS and Pro were higher than those of nitrogen treatment.The 13 growth physiological indicators detected in this experiment were used as evaluation indices to comprehensively evaluate the physiological performance of seedling growth.The scores reflected as follows:composite mycorrhizal fungi+nitrogen application treatment under any soil moisture condition＞single mycorrhizal fungi or nitrogen application treatment;under normal water conditions,nitro-gen application treatment＞mycorrhizal fungi treatment;under drought conditions,mycorrhizal fungi treatment＞nitro-gen application treatment.Research suggests that the interaction between mycorrhizal inoculation and nitrogen application can effectively improve the drought resistance of Schima superba seedlings.
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