The Study On The Effect Of Different Formula Fertilization On The Young Forest Of Phoebe Bournei

Six-year-old Phoebe bournei young forest was used as experimental material.Fifteen fertilization treatments were used to determine the contents of nitrogen,phosphorus,potassium,calcium and magnesium in roots,branches,stem,leaves and soils and their annual variations.The effects of fertilization treatments on tree height,DBH and crown growth were analyzed,and the optimum fertilization formula was selected.At the same time,the effects of different slope positions on the young forest of Phoebe bournei were studied.The main results are as follows:1,Nitrogen,phosphorus and potassium fertilization with different ratios increased the accumulation of nutrient elements in different parts of Phoebe bournei in varying degrees.Nitrogen content in different parts of Phoebe bournei and total nitrogen content in soil had the highest performance at N3 level.Phosphorus content in branches and stem had the highest performance at P3 level.The second level of phosphorus had the greatest effect on Phosphorus content in roots and leaves of Phoebe bournei and total Phosphorus content in soil.Potassium content in roots and branches and total potassium content in soil performed highest at K2 level.The potassium content in stem and leaves were confirmed to be the highest at K3 level.The calcium and magnesium contents in different parts of Phoebe bournei and in soil performed the highest at P3 levels.2,For the Phoebe bournei.,the enrichment sites of different nutrnent elements was different.Nitrogen(content)was leaves>branches>roots>stem;phosphorus(content)was leaves>branches>roots>stem;potassium(content)was branches>leaves>roots>stem;calcium(content)was leaves>Branches>stem>roots;magnesium(content)was branches>leaves>roots>stem.3,Tree height was positively correlated with the nitrogen content of roots,branches,stem and leaves,the total nitrogen content in soil and the phosphorus content of roots,but negatively correlated with other indicators.There was an extremely significant correlation between DBH and roots nitrogen content and crown width,and there was a significant correlation between DBH and cadre nitrogen content and soil total nitrogen content,a significant negative correlation between DBH and potassium content of roots,a negative correlation between DBH and soil calcium content and tree height,and a positive correlation between DBH and other indicators.Crown width was positively correlated with DBH,negatively correlated with phosphorus content of stem,total phosphorus content in soil,potassium content in roots,calcium content in roots,branches calcium content,leaves calcium content and branches magnesium content,and positively correlated with other indicators.4,Different fertilization formulas have different effects on the growth of height,DBH and crown width of Phoebe bournei.The growth of tree height was the highest at the level of N3,P1 and K3.The best formula to promote the growth of tree height was treatment J.The optimum amount of fertilizer was 200 g/plant nitrogen fertilizer and 200 g/plant potassium fertilizer.The DBH growth expressed the best at N3,P2 and K21evels.The suitable formula of DBH growth was 200g/plant nitrogen fertilizer,100 g/plant phosphate fertilizer and 100 g/plant potassium fertilizer.namely treatment N.The crown growth displayed the best at the level of N3,P1 and K3,which indicated that the optimum fertilizer formula for crown growth was 200 g/plant nitrogen fertilizer and 200 g/plant potassium fertilizer.namely treatment J.DBH and tree height are the two main factors consist of volume,and DBH had a greater impact.Therefore,treatment N was the best fertilization formula for the young forest of Phoebe bournei.5,The content of soil nutrients was different in different slopes,which affected the content of nutrients and growth indicators in different parts of Phoebe bournei.The soil nutrients showed the lower slope>the middle slope>the upper slope,The tree height and crown width both showed the lower slope>the middle slope>the upper slope,The DBH was the highest in the middle slope,followed by the lower slope and the upper slope.but there was little difference between the middle slope and the lower slope,and there was no significant difference.Therefore,the afforestation land of Phoebe bournei should be on the middle and lower slope,avoiding the upper slope as far as possible.