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以东北林业大学城市林业示范研究基地9种人工林(兴安落叶松林、樟子松林、黑皮油松林、黄波罗林、胡桃楸林、水曲柳林、白桦林、蒙古栎林和针阔混交人工林)为对象,分析林地土壤不同层次(0～10 cm和10～30 cm)As、Cd、Cu、Ni、Pb、Zn 6种重金属含量,并以哈尔滨市土壤背景值为标准,采用综合污染指数法评价各林型土壤重金属污染状况.结果表明:不同类型人工林同一土层重金属含量差异显著;除了As和Ni,同一人工林土壤重金属含量均随土壤深度增加呈下降趋势.各类型人工林同一土层重金属含量以Zn最高(62.29～126.35mg.kg-1),Cd最低(0.06～0.47 mg.kg-1).6种重金属含量由高到低顺序为:Zn>Pb>Cu(Ni)>Ni(Cu)>As>Cd,累积程度为:Cd>Pb>Zn>Cu>Ni>As.林地土壤Pb、Cd、Cu、Zn间(除水曲柳林)及其与土壤有机质、N、P、K(除水曲柳林和蒙古栎林)显著相关,且以上4种重金属含量高于背景值,为人为输入;Ni和As含量与本地背景值相当,为自然因素.不同林型土壤内梅罗综合污染指数依次为:水曲柳林>黄波罗林>针阔混交林>胡桃楸林>樟子松林>黑皮油松林>兴安落叶松林>白桦林>蒙古栎林.
Nine plantations (Larix gmelinii, Pinus sylvestris var. Mongolica, Pinus tabulaeformis, Pinus sylvestris L., Betula pendula, Fraxinus mandshurica, Betula platyphylla, Quercus mongolica and Pinus armandii Mixed plantation) were used to analyze the contents of six heavy metals (As, Cd, Cu, Ni, Pb, Zn) in different soil layers (0-10 cm and 10-30 cm) The results showed that the contents of heavy metals in the same soil layer of different types of plantations were significantly different. The contents of heavy metals in soil of the same plantation except for As and Ni all decreased with the increase of soil depth. The contents of heavy metals in the same layer of plantations were Zn (62.29 ~ 126.35mg.kg-1) and Cd (0.06-0.47 mg.kg-1), the order of the contents of the six heavy metals was Zn> Pb> Cu Cd> Pb> Zn> Cu> Ni> As. The relationship between Pb, Cd, Cu and Zn in forest soil and the relationship between soil and soil Organic matter, N, P and K (except Quercus mongolica and Quercus mongolica) were significantly correlated, and the content of above four heavy metals was higher than the background value ; Ni and As content is similar to the local background value and is a natural factor.The Merlot comprehensive pollution index of soil in different forest types is as follows: Fraxinus mandshurica> Huangpoluo> coniferous-broadleaved mixed forest> Juglans mansion> Pinus sylvestris > Pinus tabulaeformis> Larix gmelinii forest> birch forest> Quercus mongolica forest.