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试验采用列区试验设计 ,设造林密度和追肥 2个因素 ,每个因素 6个水平 ,4次重复。密度因子作主区 ,追肥因子作副区 ,各个因素和各处理按随机区组排列。每个试验小区面积 0 .0 4hm2( 2 0 m× 2 0 m) ,共计 14 4个小区 ,连续 5 a观测。经过方差分析得出 ,造林试密度对林分平均高、平均胸径和蓄积量都有极显著的影响。在 6种参试密度中 ,造林密度越大 ,林分平均高、胸径越小 ,蓄积量越大 ;6种配方追肥对林分平均高影响不显著 ,对胸径和蓄积量生长影响显著 ;密度与追肥的交互作用不显著。在所有 36个列区试验组合中 ,按经济效益排列前 5名的密度和追肥最佳组合分别为 :2 2 2 2株· hm-2和每公顷施 N、P、K分别为 2 0 0、15 0、10 0 kg,1667株· hm-2和每公顷施 N、P、K分别为 30 0、2 0 0、2 0 0 kg;1667株· hm-2 和每公顷施 N、P、K分别为 2 0 0、15 0、10 0 kg;2 2 2 2株· hm-2 和每公顷施 N、P、K分别为 10 0、5 0、5 0 kg;12 5 0株· hm-2 和每公顷施 N、P、K分别为 2 0 0、15 0、10 0 kg。它们的蓄积量分别为 183.94、188.43、169.95、164 .33、163.0 3m3· hm-2 ;利润值分别为 14 977.44、14 965 .0 9、13832 .83、13785 .80和 13345 .18元· hm-2 。
The test was designed by using column and column design. The two factors of planting density and top dressing were set at 6 levels and 4 repetitions. Density factor as the main area, dressing factor as a sub-area, all the factors and the treatment arranged by random block. Each test plot area 0. 0 4hm2 (2 0 m × 2 0 m), a total of 14 4 cells, continuous 5 a observation. Through analysis of variance, it is concluded that the test density of afforestation has a very significant impact on average height, average DBH and stock volume. Among the six tested densities, the higher afforestation density, the higher average stand height, the smaller diameter at breast height, and the larger stock volume. The top-dressing effects of six top dressing formulas had no significant effect on mean height of stands, but significant effect on DBH and stock volume growth. Interaction with top dressing is not significant. Among all the 36 column and row combinations, the best combination of density and top dressing according to the economic efficiency of the top five were 2222 hm-2 and N, P and K per hectare respectively , 15 0, 10 0 kg, 1667 plants · hm-2 and N, P, K per hectare respectively 30 0, 200 0, 200 kg; 1667 plants · hm-2 and N, P , K were 200, 150 and 10 0 kg respectively; 2 2 2 2 plants · hm-2 and N, P and K applied per hectare were 10 0, 50 and 50 kg, respectively; hm-2 and N, P and K applied per hectare were 200, 150, 10 0 kg. Their stock volumes were 183.94, 188.43, 169.95, 164.33 and 163.0 3m3 · hm-2, respectively, with profit figures of 14 977.44, 14 965.0 9,13832.83, 13785-80 and 13345.18 yuan · hm -2 .