【摘要】 日本落叶松矿柱材幼林施肥 5a的定期观测和分析结果表明 ,各种施肥处理在施肥后 3～ 4a对苗木当年的地径生长、树高生长和冠幅扩大有不同程度的促进作用。施肥后第 2年能显著促进地径增粗 ,第 3年的肥效则主要表现在对冠幅生长上 ,施肥后第 4年肥效对地径、苗高和冠幅生长都有积极影响 ,肥效至第 5年已基本消失。各种施肥处理间差异不明显 ,但随着苗木的生长 ,对P的需求有所增加 ,造林第 4年 ,施P效果突出 ,明显高于其它处理。NP、PK和NPK配合使用的效果 ,除NPK完全肥料在施肥第 2年与PK、NP、K2 7的地径当年生长量及NP的南北冠幅当年生长量有显著或极显著差异外 ,无明显区别。基肥与追肥之间肥效差异不显著更多还原

【Abstract】 The results of a five year research on growth response to fertilization in young Larix kaempferi plantation with the purpose of producing wood was studied in this paper. Periodical investigation and systematic study showed that the current annual increments growth of basal diameter, tree height and crown width of the fertilization treatments were higher than that of the check plots and last to the fourth year after planting. In the second year after the base fertilizer , the current annual increment of basal diameter of various fertilizer treatments was significant. The biggest fertilization effect was on the crown width in the third year of planting. In the fourth year, the fertilization effect was remarkable, and the current annual increments of basal diameter, height and crown width of the fertilization treatments were promoted by 66%～134%,15%～41%, 17%～47%(EW),14%～58%(SN) contrasting that of CK, respectively. The growth response of fertilization effect was not remarkable in the fifth year of planting. The effect of P application alone was better than the other treatments in the fourth year of planting. It showed that the seedlings had increasing demand for P nutrition. The growth responses of combination application of NPK?NP?PK had no obvious difference except that the current annual increment of basal diameter of NPK combined application was significantly higher than the complex of NP?PK and K 27 respectively, and the current annual increment of crown width of SN of complex of NPK was remarkably higher than NP application in the second year of planting. There was no obvious difference between base fertilizer and top dressing.更多还原