不同土壤水分对樟树赣柠1号生长及光合生理特性的影响OA

To investigate the effects of different soil moisture levels on the growth and photosynthetic physiological charac-teristics of Cinnamomum camphora Ganning No.1(a citral-type camphor tree cultivar),three year old cuttings were used as materials.Four field capacity gradients were set:W1:(85±5)%,W2:(65±5)%,W3:(45±5)%,and W4:(15±5)%.The photosynthetic physiological characteristics and chlorophyll fluorescence parameters under different treatments were ana-lyzed.The results showed that the W2 treatment was the optimal moisture condition.Under this treatment,the increments of tree height and ground diameter,as well as the photosynthetic rate,photochemical quenching coefficient,and actual quan-tum efficiency,were the highest and significantly different from those under other treatments,while the non-photochemical quenching coefficient was the lowest.As soil moisture decreased,leaf thickness decreased,malondialdehyde content in-creased,and cell membrane damage intensified.In conclusion,(65±5)%field capacity was the suitable moisture condi-tion for maintaining efficient photosynthesis,promoting growth,and preserving membrane stability in Ganning No.1 seed-lings.This finding provides a theoretical basis for water management during the seedling stage of this cultivar.