Analysis of the Impact of Density Control and Fertilization on the Transformation of Near-mature Forest into Large-diameter Chinese Fir Trees
To establish an effective cultivation technology system for producing large-diameter Chinese fir wood in the Nanling Mountain area and enhance the yield and quality of the wood,it is viable to transform the current stands into large-diameter wood forests.In this study,the near mature forest of Chinese fir was selected as the focus,and an experiment involving thinning and formula fertilization was conducted using an orthogonal design.The results indicated that the power function model demonstrated superior fitting capabilities when studying the height-DBH growth model of Chinese fir,making it the optimal choice for this analysis.After three years of cultivating Chinese fir near mature forest,there was a gradual decrease in small and medium diameter timber and a gradual increase in large diameter timber before and after treatment.The largest increment of large diameter timber was seen in treatment 2.The study found that the application of urea had the greatest impact on tree height,diameter at breast height(DBH),and volume increment per plant,followed by superphosphate application and retention density.There were significant differences in the factors affecting the increment of yield volume and yield rate of large-diameter wood.The optimal combination of increasing the yield of large-diameter wood and enhancing the yield of large-diameter wood remained consistent.The results of the experiment in this study area showed that the yield volume and yield rate of large-diameter wood saw the most significant improvement when the density of near-mature Chinese fir forest was at a medium or high-medium level,with urea and superphosphate both at a medium level.
Cunninghamia lanceolate(Lamb.)Hook.near-mature forestcultivation for large-diameter timberdensity controlprecision fertilization control
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