【摘要】 通过对黑龙江省伊春林区低质林林分的实地调查,从林分树种组成、水平结构、垂直结构、林木离散程度等4个方面进行定量分析,得出该林分树种组成广泛,但经济价值高的树种所占比例较少;林分树高上、中、下3层林木株数之比为1∶3.81∶2.46;相邻径级株数之比均值为1.205;聚集指数为0.3045。从数值上进一步分析了低质林林分的树种、径级、树高及空间布局的特征,丰富和完善了低质林界定和分类标准。更多还原

【Abstract】 A survey was conducted on low-quality forest stands in Yichun Forest Region of Heilongjiang Province in terms of species composition,horizontal structure,vertical structure,and tree distribution. Results showed that the tree species in the low-quality forest stands were abundant but the proportion of tree species with high economic value was lower. The ratio of tree quantities in upper,middle and lower layers of tree height was 1∶3.81∶2.46,and that for neighboring diameter class was 1.205 and the value of aggregation index was 0.3045. The spatial distribution characteristics of tree species,diameter class,and tree height of low-quality forest stands were analysed,which could improve the classification standards for low-quality forest stands.更多还原