施肥对马尾松中龄林生长量和产脂的影响

施肥对马尾松中龄林不同施肥处理间未采脂木实际年生长量和松脂产量都存在一定的差异。不同施肥处理的未采脂小区,材积年增长量以处理3(KBCZn)为最高,其实际年材积增长量为28%,年蓄积量收益高于对照1 134元.hm-2,生长量最低的为处理1(NBCuZn),实际增长量低于对照34.8%;其次,松脂单株日产量除处理6(PKBCuZn)显著低于对照14%外,其它处理与对照均无显著差异;不同施肥处理的采脂小区,所有处理与对照均无显著差异。另一方面,与对照比较,不同处理,马尾松采脂增益远远大于因采脂对蓄积的影响。单施K肥或P肥对生长有促进作用,单施N肥对生长有抑制作用;氮磷、氮钾、磷钾的配合施用效果好于对照,其中磷钾配合施用的效果最好。

Effects of fertilization on the growth and resin yield of middle-aged forest of Pinus massoniana

The oleoresin tapping and fertilization experiment were conducted on the middle-aged forest of Pinus massoniana.The experiment results showed that different fertilization treatments had significant effects on growth of diameter and volume and oleoresin yield.The annual increment of volume for K15B0.15Cu0.075Zn0.075 was the highest among all the treatments to integrity pine,the annual volume growth was 28% higher than the controlled treatment and the volume income was 1 134 yuan·hm-2 higher too.The N15B0.15Cu0.075Zn0.075 was the lowest among all the treatments,the volume growth was 34.8% lower than the controlled treatment.Different fertilization treatments had no significant effects on daily oleoresin production except P30K15B0.45Cu0.225Zn0.225,and the P30K15B0.45Cu0.225Zn0.225 was 14% lower than the controlled treatment.To the tapping pine,P30K15B0.45Cu0.225Zn0.225 was the highest among all the treatments,but all fertilizations had no significant effects on them.The annual volume income of N15K15B0.3Cu0.15Zn0.15was 1 512 yuan·hm-2 higher than the controlled treatment.On the other hand,the oleoresin income was far higher than the reducing volume income because of oleoresin tapping,so we should encourage oleoresin tapping for the middle-aged forest of P.massoniana,but oleoresin tapping could inhibit the pine growth.P or K also had promising effects to promote the pine growth,however,N could inhibit the pine growth,and there were little difference in growth for B,Cu,Zn.It was better to apply NP,NK,PK with CK,and PK was the best,and otherwise NP,NK,P and K had the same effects.