间伐对马尾松中龄林生长的影响

Thinning Effect on the Growth of middle aged Pinus massoniana plantation

研究了间伐对14a林龄马尾松人工纯林生长性状的影响。结果表明:间伐对胸径生长有显著的影响,强度间伐后胸径生长量比未间伐的生长量增加3.35cm,中度间伐后胸径生长量增加了2.10cm,弱度间伐后增长了1.25cm;间伐对单木材积生长量影响显著,强度间伐后单木材积生长量比未间伐的生长量增加0.06144m^3,中度间伐的生长量增加了0.04607m^3,弱度间伐的生长量增加了0.03126m^3;间伐对蓄积生长量有极显著的影响,强度间伐后蓄积生长量比未间伐的生长量增加44.1m^3,中度间伐的生长量增加了25.21m^3,弱度间伐的生长量增加了17.66m^3;但是间伐对树高的生长影响不大。

The study takes M-year-old Pinus massoniana plantation as the research object to investigate the effects of dif- ferent thinning intensity on the growth of P. massoniana. The results showed the different thinning intensity had a signifi- cant effect on the growth of DBH. The growth rate of DBH increased by 3.35cm after high intensity thinning compared with the non thinning, the growth rate of DBH increased by 2.10cm after moderate thinning, and the growth of DBH increased by 1.25cm after weak thinning;The different thinning intensity had a significant effect on the growth of single tree volume. The growth rate of single tree volume was increased by 0.06144m^3 after intensity thinning compared with the non thinning, the growth rate of single tree volume was increased by0.04607m^3 after moderate thinning, and the growth of single tree vol- ume increased by 0.03126m^3 after weak thinning. The different thinning intensity had a great significant effect on the growth of volume. The growth rate of volume was increased by 44.1m^3 after intensity thinning compared with the non thin- ning, the growth rate of volume was increased by 25.21m^3 after moderate thinning, and the growth of volume increased by 17.66m^3 after weak thinning; The different thinning intensity has little effect on the growth of tree height.