Response of biomass allocation of Pinus yunnanensis seedlings to the age of stumping seedlings
In order to reveal the response of biomass allocation of Pinus yunnanensis Framch.seedlings in different growth stages to the stumping age,uniform stumping was applied on P.yunnanensis seedlings at the age of 6 months(Treatment 1),10 months(Treatment 2),14 months(Treatment 3),18 months(Treatment 4),and 30 months(Treatment 5).Subsequently,the biomass were examined by whole plant harvest method on single plant,taproot,lateral root,stem,sprout strip,underground part and above ground part at 60,120,180,240,300,360,420 and 480 days after stumping.The proportions of biomass allocation for each component were calculated to analyze the differences in biomass allocation among the different treatments.As time progressed after stumping,the differences in biomass allocation among the different treatments began to narrow.For the younger age treatments(1,2,3),sprout biomass allocation was the highest initially and decreased with the increase of seedling age.The sequence of biomass allocation was as follows:sprout>stem>taproot>lateral root;above-ground portion>below-ground portion.240 days after stumping,the differences between Treatment 1 and other Treatments became insignificant.Stumping also altered the biomass allocation patterns for the older age Treatments(4,5)at 60 days,which were observed as follows:primary root>stem>lateral root>shoot.From 120 days to 300 days,the pattern shifts to stem>primary root>shoot>lateral root.After 360 days,the biomass allocation pattern for components in treatment 4 and 5 gradually transitioned to align with the other treatments,which was characterized by sprout>stem>taproot>lateral root.In summary,stumping can change the biomass allocation patterns of P.yunnanensis seedlings by utilizing the compensatory growth characteristics of plants.Stumping altered the biomass accumulation and allocation patterns of seedlings at different ages,and promoted sprouting.With the passage of time,the biomass allocation pattern of seedlings with different stumping age showed that the sprout biomass allocation was the largest.This experiment suggested that stumping is more effective for younger seedlings and is more suitable for such age groups.
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