大兴安岭白桦低质林生态功能评价指标的灰色关联聚类分析

Grey Relation Clustering Analysis of Evaluation Indices of Ecological Functions of Low-Quality Birch Forests in Greater Xing'an Mountains After Reconstruction by Different Transformation Methods

通过相应的试验方法评价大兴安岭白桦低质林土壤理化性质,土壤重金属积累情况,枯落物蓄积及持水性能,低质林生物多样性程度;应用灰色关联聚类对以上各个低质林生态功能指标进行聚类分析,结果表明:白桦低质林土壤孔隙度与土壤速效N、P、K元素含量处在同一个聚类,反映了低质林的土质疏松程度、土壤肥力,土壤密度与土壤含水率、土壤重金属Cd质量分数、枯落物蓄积量、枯落物最大持水率以及低质林生物多样性在同一个聚类,反映土壤的锁水能力、枯落物层持水性能、重金属积累情况等。

An experiment was conducted to evaluate soil physical and chemical properties, heavy metal accumulation, biodiversi- ty, as well as volume and water holding capacity of litter in low-quality birch forest in Greater Xing＇ an Mountains through relevant experimental methods. The ecological function indices were evaluated by the grey clustering analysis. Results show that soil porosity, available N, available P, and available K clustered in the same group, which reflect soil loosening degree and fertility. However, soil density, moisture content, heavy metal （Cd） content, biodiversity, as well as volume and water holding capacity of litter belong to the same cluster, which reflect the status of soil and water conservation, water holding capacity of litter, and heavy metal accumulation.