木荷—里白林主要优势种群42a动态变化

42 Years' Population Dynamics of Several Abundant Species in the Schima superbae-Diplopterygiumetum glaucum Forest

根据浙江天童次生木荷林抚育42 a的永久样地1972年、1983年和2014年3次调查数据，分析木荷林中主要树种的种群动态。结果显示：木荷林抚育后随着林龄增加样地内胸径≥5 cm的成树密度在3次调查中呈逐年递减趋势，而林分胸径断面积和蓄积量呈逐年增加趋势。林分蓄积年生长率为2.4％。林分优势种为木荷、栲树和石栎种群，优势度明显；且木荷、栲树种群结构为单峰曲线，石栎、浙江新木姜子等为逆“J”型，更新层中里白独占优势。在3次调查中，木荷林的1～5级木分化等级范围由1972年的3级扩展成2014年的5级，分化明显。其经营策略可采用近自然林经营技术，将里白连续割除2 a，开展森林综合抚育；培育目标树结实更新；清理枯立木、风倒木和干扰木；在“林窗”中少量补植地带性顶级阔叶树种。

The 42 years′secondary Schima superba forest in Tiantong National Forest Park was analyzed.Our results showed that af-ter management,density of adult trees （diameter at breast height≥5 cm） of the community was monotonic declining in 1972,1983 and 2014.However,total DBH area and growing stock were monotonic increasing in the three survey years.Growing stock accumula-tion rate was 2.4% per year.Dominant tree species of the community were Schima superba, Castanopsis fargesii and Lithocarpus glaber;population structures were unimodal type for Schima superba,Castanopsis fargesii and reverse″J″type for Lithocarpus glaber, Neolitsea aurata.Diplopterygium glaucum was absolutely dominated in the regeneration layer of the community.During the 3 surveys, size classes of Schima superba expanded from 3 classes to 5 classes Based on these results,management strategies of the community were suggested to follow the near natural-forest technology after clear cut the Diplopterygium glaucum in the first two years with other comprehensive forest managements.Other suggested managements includes selecting well-growing steadings as target trees,cleaning dead trees and competing trees,and replanting a few typical local broad-leaved species in forest gaps.