【摘要】 采用正交设计,对立地指数为12~14的23 a生马尾松天然次生林不同肥种与配比施肥4 a后的效果进行了系统研究.其主要结论是:(1)氮、磷、钾3种肥料对马尾松胸径、材积以及经济产量增长具有显著或极显著影响,其对胸径与经济产量影响效应主次为磷肥>钾肥>氮肥,而对材积增长影响效应主次则为磷肥>氮肥>钾肥,并3种肥料对树高的影响中仅钾肥的影响达到极显著水平,而氮肥及磷肥的影响不明显.(2)磷肥对木材比重有显著影响,而氮肥和钾肥的影响不明显,施用磷肥将给木材比重带来一定的负面影响,而其影响的显著性程度以磷肥施用量300 g/株为阀值.(3)对经济产量具有显著性影响的肥种有磷肥和钾肥,尤以磷肥的影响为最大.(4)肥种间交互作用明显,全营养配方施肥的效果明显优于单一肥种,在土壤较为贫瘠,磷、钾缺乏的林地进行氮、磷、钾全营养配方施肥具有明显的增产效应,与不施肥处理相比较,最优配方施肥单位面积材积与经济产量可提高104.4%和81.2%;在南方低山丘陵区红壤地地位指数为12~14的马尾松天然林最佳施肥配方为氮肥50 g/株,磷肥300 g/株,钾肥150 g/株.(5)不同立地条件其施肥效果存在一定的差异.更多还原

【Abstract】 Systematic research was done on measuring the effects of fertilizer application on different single fertilizer and different proportioning fertilizer 4 years after fertilization in the 23-year-old natural secondary forest of Pinus massoniana by orthogonal design method.The results show:(1)The obvious effects were an increase in the diameter breast height,volume and economic production of P.masoniana caused by the application of fertilizer N,P and K;the effects on the increase of diameter breast height and economy was P>K>N;the effect on the increase of volume was P>N>K and the effect on the increase of height was only K.(2)The effect on the wood proportion by P was obvious;P brings a negative effect to the wood proportion and the most obvious effect is fertilizer 300 g per plant.(3)The effects on the economic production were P and K,especially P.(4)The effects on the interaction of fertilizer with N,P and K and a complete fertilization was more effective than the incomplete practice of single fertilizer.Applying the complete fertilization resulted in the best fertilizer method with the complete fertilization;compared with no fertilization the effects were an increase of 104.4% in volume and 81.2 % in economic production.The best fertilization for P.masoniana planted in the red soil in index 12～14 of the hills in southern China was 50 g(N),300 g(P) and 150 g(K) per plant.(5)Difference existed on fertilization of different site conditions.更多还原