马尾松人工中龄林施肥肥效与增益持续性研究

通过13a的观测资料表明,在红壤地区施N肥对马尾松中龄林生长不利,施P、K肥有利于马尾松中龄林生长,且肥效持续时间长,最佳处理组合为N1P3K2,即每公顷施N、P、K分别为0、240、65kg.其中P3水平树高、胸径、蓄积12a定期生长量比对照P1水平分别高6.1%、15.0%、12.3%.施肥一定时间后林地质量仍是马尾松生长密切相关的因子,施肥不会促进马尾松中龄林在空间层次上的分化.

Fertilization Effectiveness and Gain Sustainability of Middle aged Pinus massoniana Plantation

Thirteen years' test of Pinus massoniana plantation fertilization showed that fertilizing P and K on red soil area benefited the growth of middle aged P. massoniana plantation and the effect of fertilizer lasts long, while applying N fertilizer was disadvantageous to the growth of plantation. The best combination of fertilizer was N₁P₃K₂, i.e. the applying of N, P, and K fertilizers in the ratio of 0 kg, 240 kg, 65 kg per hectare. Taking P₁ (0 kg per hectare) as control, P₃ (240 kg per hectare) treatment will increase the periodic increments of tree height, DBH and volume by 6.1%, 15.0% and 12.7% respectively. In the certain stage after fertilizing, site quality will still be a factor closely correlated with the growth of P. massoniana. Fertilization will not promote the spatial differentiation of middle aged P.massoniana plantation.