【摘要】 以杂交鹅掌楸幼林为试材,采用3因素5水平二次通用正交旋转组合设计,建立了磷元素缺乏林地上施用氮磷钾肥对杂交鹅掌楸幼林生长的效应模型,经检验模型对1年生鹅掌楸树高、单株材积和2年生鹅掌楸地径增量拟合性较好,对其他生长量拟合不显著。对肥料主效应的分析结果表明,磷肥对1年生鹅掌楸树高、单株材积和2年生鹅掌楸地径增量影响最为强烈,但施用氮肥和钾肥同样能起到促进杂交鹅掌楸幼林生长的效果。两因素交互效应分析表明,氮磷钾相互间存在明显交互效应,氮和磷、磷和钾的交互最为强烈。经模拟寻优,获得氮磷钾的优化施肥方案为施尿素44~65 g/株、过磷酸钙188~261 g/株和氯化钾26~44 g/株,1年生鹅掌楸树高、单株材积和2年生鹅掌楸地径增量分别为(38.6±0.8)cm、(58.7±1.4)cm3和(1.38±0.01)cm。更多还原

【Abstract】 With three factors design of universal quadratic rotation combination,the models were established on the effects of N,P and K fertilizer on growth of young plantation of Liriodendron chinese×L.tulipifera in the condition lacks P element.According to the test results,the quadratic regression model had better simulation effect of 1-year plantation on height and volume,2-year plantation on diameter,while hardly effect on other growth targets.Through the analysis of the main effect of fertilizer,it showed that N,P and K had different influences on young plantation: P had the most dramatic influences,but N and K could also help promote the growth of young plantation.Two-factor interaction analysis showed that there was significant interaction between two fertilizer factors that could promote the plantations grow,among of which,N and P,P and K had more intensive interaction.By computer simulating,the optimum fertilization combination for growth of young plantation was urea 44—65 g per plant,superphosphate 188—261 g per plant and potassium chloride 26—44 g per plant,with the average increment of plant 1-year height,volume and 2-year diameter were(38.6±0.8) cm,(58.7±1.4) cm3 and(1.38±0.01) cm.更多还原