摘要
连续４年对幼龄兰考泡桐胶合板材林进行营养补给效应研究的结果表明：造林后前二年营养补给对泡桐生长无明显促进效应，第三年采用Ｎ１００Ｐ２５Ａ３０进行营养补给，对泡桐胸径、胸高断面积和材积生长具有显著的促进效应，分别提高６．１０％，１２．７２％，１３．３４％，而对高生长无显著效应．其效应主因子为磷肥，次因子依次为氮磷交互、深度和氮肥，最佳营养补给组合为Ｎ１００Ｐ２５Ａ４０采用Ｎ１００Ｐ２５Ａ３０进行营养补给，具有显著的经济效益，其内部收益率可达１５．４６％．
Four year's studying of the effects of fertilization on young Paulownia elongata plantation shoal that fertilization has no significant effects on Paulownia within two years after planting; fertilizing with N100P25A30 has significant effects on DBH, SBH and V, increasing to 6. 10%, 12. 72% and 13. 34% respectively three years after planting, but has not significant effects on height growth; its main factor is P, followed by N× P, N and depth (A). The optimum fertilizing combination is N100P25A40. The IPR of fertilizing(economic benefit) reachs 15. 46%.
出处
《中南林学院学报》
CSCD
1996年第2期9-15,共7页
Journal of Central South Forestry University
基金
国家"八五"攻关专题
关键词
泡桐
营养补给
经济效益
幼林
Paulownia
young plantation
nutrient compensation
economic benefit
