Study On The Key Technique Of Cinnamomum Bodinieri Container Seedling

To explore the key technology of Cinnamomum bodinieri container seedling,studies on the selection of seedling container,substrate formula and suitable illumination intensity for annual container seedling of C.bodinieri was emphatically carried out in this test.Comparison on the afforestation effect of container seedling and bare-rooted seedling was conducted to provide scientific basis for the production of C.bodinieri container seedling.Research results are as follows:(1)The seedling height,ground diameter,total dry weight,and seedling quality index of C.bodinieri in large-sized white non-woven bags and black seedling pot were extremely significant(P<0.01)higher than those in small-sized white non-woven bags and black seedling pot.When the container size is the same,the diameter,biomass,SPAD value and soluble sugar content of C.bodinieri in non-woven bag are significantly higher than those in black seedling pot,and the biomass distribution ratio of different organs of C.bodinieri in non-woven bags was relatively balanced with the biomass of root,stem,and leaf as approximately 1:1:1.But the biomass of different organs of C.bodinieri in black seedling pot was the largest in its root system,accounting for more than half of the whole plant biomass,the second is in the leaf and minimum in the stem,with a distribution ratio of close to 5:2:3.Therefore,the non-woven bag is more conducive to the growth of overground part of C.bodinieri than the black seedling pot.The results of this test showed that 15 cm × 18 cm non-woven bag can provide best seedling effect for annual container seedling of C.bodinieri.(2)Different substrate ratios had extremely significant influence on the seedling height,ground diameter,biomass,seedling quality index,leaf chlorophyll value,soluble sugar content and soluble protein content of annual container seedling of C.bodinieri Among them,treatment of 5 seedling height,seedling quality index were significantly or extremely significantly better than other treatments except for treatment of 4.The ground diameter and total dry weight were significantly or extremely significantly better than other treatments;treatment of 4 seedling leaf soluble sugar content was extremely higher than other treatments except for treatment of 2,the soluble protein content was significantly or extremely significantly higher than the rest of treatments.The PCA result showed that treatment of 4 seedlings had the strongest physiological activity,and treatment of 5 seedlings had the largest growth amount.Therefore,suitable substrate and ratio for annual container seedlings of C.bodinieri should be: red-heart soil: fire soil: peat soil: river sand: bio-organic fertilizer = 3~5:2~3:1:2~3:1.(3)The seedling height and aboveground biomass of C.bodinieri significantly increased when the shading degree was 30%,while the underground biomass decreased with the increase of shading degree,presenting a certain negative correlation;shading could significantly improve the leaf chlorophyll value and soluble protein content in seedling leaves,but its soluble sugar content decreased with the increase of shading degree.When the shading degree was 30%,the soluble sugar content of leaves was not significantly different with that under full light exposure.But when shading degree reached 50%,the soluble sugar content in the leaves significantly reduced.Therefore,30% shading is optimal for the annual container seedlings of C.bodinieri.(4)Transplantation of annual container seedling has significantly better afforestation effect than bare-rooted seedling.The seedling height increment in the next year of afforestation was 2.75 times than bare-rooted seedling,and the ground diameter increment was 1.46 times than bare-rooted seedling.