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至６年生时，对湿地松、火炬松造林密度试验的树高、胸径、材积等因子进行方差分析，结果表明：不同密度造林的林分平均高影响不大，处理间无显著差异；湿地松的胸径生长量处理间无显著差异，但６年生时的火炬松胸径生长量处理间呈现显著差异；对单株材积生长影响不大，处理间无显著差异，但单株材积生长规律与胸径生长规律是一致的；对单位蓄积量影响极大，处理间差异显著。
The results of variance analysis of the factors such as height, DBH and volume of afforestation density test of Pinus elliottii and Pinus taeda showed that the average height of afforestation with different densities had no significant difference, and there was no significant difference between treatments. There was no significant difference between the DBH growth treatments, but there was a significant difference in DBH growth of 6-year-old lobes. There was no significant difference in single-plot volume growth but no significant difference between treatments. However, The law is consistent; the volume of unit volume is greatly affected, the difference between treatment is significant.