磷对芳樟苗期生长及精油质量的影响OA

To investigate the impact of phosphorus(P)on the growth,photosynthetic characteristics and leaf essential oil content of linalool type of Cinnamomum camphora seedlings,2-year-old cutting seedlings were using as materials,and 4 phosphorus levels were established including 0.04(P1),0.20(P2),1.00(P3)and 2.00 mol·L-1(P4),with a control group(CK)using no phosphorus.Differences in seedlings height,stem diameter,leaf area,biomass accumulation,chlorophyll content,photosynthetic characteristic,leaf malondialdehyde(MDA)content and leaf essential oil content were analyzed across varying phosphorus levels.The results indicated that phosphorus addition significantly affected the biomass accumulation,photosynthetic characteristics,essential oil content and linalool yield of linalool type of C.camphora seedlings.Seedling height,leaf area,leaf and whole-plant biomass showed significant increases under the P2 and P3 treatments compared to CK.However,there was no significant differences in ground diameter growth and root biomass accumulation.The addition of phosphorus increased the content of chlorophyll a(Chla)and chlorophyll b(Chlb)in seedling leaves,enhanced photosynthetic capacity by increasing parameters such as net photosynthetic rate(Pn),stomatal conductance,transpiration rate,light compensation point and dark respiration rate.As phosphorus content increased,MDA content in leaves initially decreased and then increased.The highest essential oil content and linalool yield was observed at the P2 treatment,with increases of 22.50％ and 50.00％compared to CK,respectively.Correlation analysis indicated that essential oil content and linalool yield were positively correlated with leaf biomass,Chla,and Chlb.In conclusion,phosphorus significantly improved growth parameters,photosynthetic characteristics,essential oil content and linalool yield in C.camphora seedlings,with the optimal condition being a content of 0.20 mol·L-1.Above results could provide a theoretical basis for phosphorus fertilizer application for the directional cultivation and high-quality and efficient cultivation of camphor raw material forest.