马尾松人工中龄林施肥肥效与增益持续性研究

Fertilization Effectiveness and Gain Sustainability of Middle aged Pinus massoniana Plantation

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、2 4 0、65 kg。其中 P3水平树高、胸径、蓄积 12 a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 。

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 N 1P 3K 2, i.e. the applying of N, P, and K fertilizers in the ratio of 0 kg, 240 kg, 65 kg per hectare. Taking P 1 (0 kg per hectare) as control, P 3 (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.