摘要
加勒比松1a生幼林氮磷钾不同配比的追肥试验表明，追肥后6a，肥效都极显著；其中以第2a的效果最显著，最大树高、胸径、材积分别比不追肥增加39．1％～52．6％、45．4％～109．3％和34．1％～405．6％；6a后肥效下降，但追肥仍比不追肥的树高、胸径、材积增长8．7％～20％、10．9％～17．9％、31．5％～54．7％。氮磷钾配合施用的效果最佳，施氮磷而缺钾有负效应。当氮磷钾相同配比（N30P30K30）时有特殊的低效应。
The test of top dressing in different proportion of N, P and K to young Pinus caribaea forest is reported in this paper. The results show that top dressing has extremely significant effect on the trees.Especially in the second yeal the height, the chest diameter and the volume of tree are increased by 39.1 %~52.6%, 45.4 %~109.3 % and 34.1 %~405.6% than the check. After six year, the fertilizahon effect isreduced, but the height, the chest diameter and the volume of tree are still increased by 8.7 %~20%, 109%~17.9 % and 31.5 %~54.7 % than the check. The effect that nitrogen, phosphorus and potossium arecooperatively used is the best. When nitrogen and phosphorus are applied but potassium is lacked, there is a negative effect. But when nitrogen, phosphorus and potassium are equally applied (N30P30K30), there is an effect of exceptional low yield.
出处
《土壤与环境》
CSCD
1999年第3期216-220,共5页
Soil and Environmental Sciences
关键词
加勒比松
幼林
追肥效应
Pinus caribaea
young forest
effect of top dressing
