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以四川省宜宾市高县巨桉试验林为研究对象,采用4因素5水平二次通用旋转组合设计方法,建立了密度、氮、磷、钾施肥与5年生巨桉人工林单株木地上部分生物量之间的效应模型,经检验,二次回归模型拟合较好.通过对模型的交互效应分析发现:氮肥与磷肥之间存在明显的协同效应,氮肥与钾肥和磷肥与钾肥之间协同效应不明显.对回归模型进行频数分析,密度、氮、磷、钾4因素取95%的置信区间的高产栽培措施组合为:密度1860-1935株/hm~2,氮肥56-64 g/株,磷肥47-56g/株,钾肥37-46g/株.
Taking the giant eucalyptus grandis plantation in Gaoxian County, Yibin City, Sichuan Province as the research object, the quadratic universal rotary combination design method of 4 factors and 5 levels was used to establish the experiment of density, nitrogen, phosphorus and potassium fertilization and five years’ The model of the interaction between biomass and biomass was tested and the quadratic regression model fitted well.The interaction effects between the model and nitrogen fertilizer showed that there was a synergistic effect between nitrogen fertilizer and phosphate fertilizer and the synergistic effect between nitrogen fertilizer and potassium fertilizer and phosphorus fertilizer and potassium fertilizer The frequency of the regression model was analyzed, and the high-yielding cultivation combinations with 95% confidence intervals of 4 factors of density, nitrogen, phosphorus and potassium were as follows: density 1860-1935 plants / hm 2, nitrogen fertilizer 56-64 g / plant , 47-56g of phosphate fertilizer and 37-46g of potassium fertilizer per plant.