辽宁温性蒙古栎植被类型与枯损量抚育间伐技术的探讨

Research on Vegetation Types of Temperate Quercus mongolica and Its Mortality and Tending Techniques in Liaoning

调查了辽宁温性蒙古际群落．划分了5个群丛组、并叙述了各群丛组的主要特征。调查统计和对20a间乔木层生长量及枯损量的观测得出、群丛组间材积生长量、枯损量差异明显．不同林龄的林分枯损量也有变化。株数枯损量的高峰期是林龄10～20a，枯损率高峰期为3．3～4.5a；而材积枯损量的高峰期却在林龄的30～40a；枯损率高峰期为2．0～3．0a。为了有效利用群落的防护功能及木材资源。根据群落的生物学特性、生态功能、生长量和枯损量等指标．探讨了群落的保护抚育间伐技术。16a的观测结果证明．抚育间伐后N（株数）枯损率0．22～0．67、V（蓄积）枯损率0．3～0．8、林分层生长量提高10％～35％。

In this paper, the community of temperate Quercus mongolica was divided into 5 association groupsand the major characeristics of each group were described. The results of statistics and observations onthe growth and mortality of arborescent layers for 20 years indicated that the volume increment andmortality for each association group differed remarkably and mortality differed also for different agedstands. The peak Period of mortality for number of stems was 10 ~ 20 years stands, and for mortalityrate tvas 3. 3 ~ 4. 5 years; The peak period of volume mortality was 30 ~ 40 years stand, and formortality rate was 2.0 ~ 3.0 years. In order to utilize protective functions and timber resources ofcommunity effectively, the techniques of protection tending were studied on the basis of biologicalcharacteristics, ecological functions, growth, mortality and other indexes of the community. TheObeervaion results for 16 years opoved that the mortality rate was 0. 22 ~ 0. 67(numter of stems) and 0. 30 -0. 80(volume) per year, respectively; meanwhile, the total growth increment of stands upgraded 10% ~ 35%.