蒙古栎林间伐抚育龄级及种群变化规律的研究

Variation Regularity of Population and Age Class of Tending Thinning in Quercus mongolica Plantation

从蒙古栎林的径阶结构、林龄和分布株数出发,研究了不同间伐强度对种群密度、蓄积量、灌草生物量的影响。结果表明:受保留植株的限制,与对照相比,弱度间伐蓄积量有所提高,中度间伐蓄积量提高最为显著,重度间伐出现总蓄积量显著降低,但灌木和草本生物量相对较高。不同试验处理中,中度间伐抚育强度大,径级株数最多,对蒙古栎种群龄级株数的影响显著。因此,推荐中度间伐抚育技术措施,兼顾蓄积量、立木材质及林下灌草生物量,以提高蒙古栎林的经济效益和生态效益。

From the diameter class structure,stand age and distribution of the number of trees for Quercus mongoli-ca ,effects of different thinning intensities on the population density,the stock volume,shrub and grass biomass were discussed.Result shows that the strength thinning was restricted by reserved number of trees;compared with the CK,stock volume increased by adopting weak thinning;stock volume increased significantly by adopting moderate thinning;severe thinning showed significant decrease.Shrubs and herb have higher biomass.Among different ex-periments,moderate thinning have great tending strength,number of diameter class are the maximum;it is signifi-cant for tending thinning to numbers in age class of the populations for Quercus mongolica .Taking into account the stock volume,material of live tree & biomass understory shrub and grass,so as to improve the economic and ecolog-ical benefits of Quercus mongolica forests.