采伐强度对阔叶红松林空间结构的影响

Influence of Cutting Intensities on Spatial Structure of Broadleaved Korean Pine Forest

在带岭林业实验局东方红林场,选择采伐强度分别为13%(弱度)、29%(中度)、52%(强度)、71%(极强度)的4块样地,采用角尺度、混交度、大小比数3个空间结构参数,分析采伐干扰对阔叶红松林空间结构的影响。①由角尺度分析表明:采伐后阔叶红松林的林木分布格局都以团状分布为主,采伐强度对林分水平分布格局的影响较小;弱度和中度采伐时,林分水平分布格局与未经采伐干扰的对照样地相似。②由混交度分析表明:随采伐强度的增加,平均混交度有下降趋势,采伐强度越大,混交度变化越明显;各树种在弱度或中度采伐的林地中混交度最大,说明适当进行人为干扰,可促进林分结构的调整;③由大小比数分析表明:采伐后林分在空间大小分化程度上分布都比较均匀,并且随采伐强度的增加,不同树种的优势程度会发生不同变化。

The experiment was conducted to analyze spatial structure of broadleaved Korean pine forest after cutting disturbance with four different cutting intensities plots （13% , 29% , 52% and 71% ） and three spatial structure parameters （neigh- borhood pattern, mingling and neighborhood comparison） in Dongfanghong Forest Station of Dailing Forest District. In neighborhood pattern, the horizontal distribution of stand is dominant by clumped distribution, and the cutting intensity has less effect on stand horizontal distribution pattern. The plots with low intensity and medium intensity are similar to the con- trol without cutting disturbance. By mingling analysis, the average mingling was downward trend with the increase of cut- ting intensity. The mingling of each species is the largest in low or medium intensity plots, and the appropriate human in- terference can promote adjusting stand structure. The larger the cutting intensity is, the more obvious the change of ming- ling followed. The size of trees differentiation of this stand is relatively uniform by trees species neighborhood comparison. With the increase of cutting intensity, the dominant degree of species would definitely change.