林分密度及施肥对马尾松林产脂量的影响

Effect of stand density and fertilization on resin yield of Pinus massoniana

采用长期定位观测,定时、定株收获的方法,研究了马尾松采脂林4种保留密度及16种施肥组合对产脂量影响。结果表明：不同密度松脂产量差异显著,随着密度的增大,单位面积松脂产量也随之增加,呈正相关关系,单株平均年松脂产量则随密度增大而减少,初步认定培育马尾松高产脂林保留密度C—D（750~900株.hm-2）较适合;在中等立地,施肥能有效增加松脂产量,不同施肥组合的松脂产量存在明显差异。较理想的3个施肥组合是：N250 g/株＋P 500 g/株、P 1 000 g/株＋K 300 g/株和N 250 g/株＋K 150 g/株。同时分析了主要气象因子对松脂年产量变化的影响。

The resin yield of Pinus massoniana stand was studied in four kinds of reserve density and combinations of sixteen kinds of fertilizers,by the methods of log-term and located observation,and fixed time and fixed tree harvest.The results show that resin yield was significantly different among densities,as the density increases,the unit area of resin production also increased,there was a positive correlation,and resin production per plant reduced with increasing density.The results indicat that the suitable stand density C-D of high yield resin was（750~900 plant·hm-2）.In the middle site,fertilization could increase the resin yield,the resin yields were significantly different among different fertilizer combinations.Ideal fertilizer combinations were N 250 g/plant＋P 500 g/plant,P 1 000 g/plant＋K 300 g/plant and N 250 g/plant＋K150 g/plant.The effect of meteorological factors on the resin yield was also studied.