Study on the Effect of Continuous Fertilization on the Growth of Pinus massoniana Lamb.Forest and Its Effectiveness
In order to explore the effect of continuous fertilization of different formulas on the growth of Pinus massoniana Lamb forest and its fertilizer effect,and to screen suitable fertilization treatment,This study takes the 8-year-old Pinus massoniana Lamb plantation as the research object,and uses a completely random zone design to carry out a three-year continuous fertilization test,setting up nitrogen fertilizer(T1),phosphorus fertilizer(T2),ni-trogen phosphorus potassium fertilizer(T3),nitrogen phosphorus potassium fertilizer+micro fertilizer+lime(T4),organic inorganic compound+micro fertilizer+lime(T5)and no fertilizer(CK).Based on the growth measure-ment data for 3 consecutive years,the fertilizer effects of different fertilization treatments are analyzed and com-pared.The results show that continuous fertilization can significantly increase the growth of Pinus massoniana Lamb forest,especially the T5 treatment has the best effect of increasing yield.T4 treatment has the greatest im-pact on the growth of chest diameter.Compared with before fertilization,the increase is 2.27cm,3.21cm and 3.77 cm respectively.Compared with CK,the growth rate is 75.9％,80.3％and 72.1％.For the high growth of trees,T1 treatment is the largest in the first year.The increase is 1.22 m compared with CK increased by 110％before fer-tilizer.In the second year,it was treated with T5,with the largest.Compared with before fertilization,it increased by 3.02 m.Compared with before fertilization,the growth rate of CK increased by 52.5％.In the third year,the maximum growth rate of T2 was increased by 23.8％compared with CK;for single plants,T5 treatment is the most affected by the salum,with an increase of 0.036 m3,0.070 m3 and 0.090 m3 compared with before fertiliza-tion.Compared with CK growth of 112.0％,75.0％and 69.8％respectively,the basic ground contribution rate of Pinus massoniana Lamb accumulation growth increases over time.T1,T3,T4,T5 and CK all show a trend of de-creasing first and then increasing.The fertilizer contribution rate is opposite,and there are significant differences between them.However,T2 processing shows a trend of continuous decline.The stability and sustainability of the growth of Pinus massoniana Lamb accumulation in the second and third year after fertilization is significantly higher than that of CK,of which T4 treatment is the highest,but there is no significant difference from T5 treat-ment.The comprehensive results show that the application of organic inorganic compound fertilizer+micro fer-tilizer+lime powder treatment is significant for the growth and production of the Pinus massoniana Lamb forest.
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