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文中对洛川塬面40年连续果林园土壤的Cu、Cr、Pb、Ni、Zn、Mn分布特征进行了研究。结果表明:洛川塬苹果园土壤中除Cu外,Cr、Pb、Ni、Zn、Mn五种元素都表现为剖面上、下部含量基本相同或下部含量高于上部的含量。尽管Cu、Cr、Pb、Ni、Zn、Mn含量未超出土壤环境质量标准,但均高于区域背景值,元素在土壤中发生了累积。主要原因为人类活动造成土层结构的破坏,以及对果园施肥、喷药等管理环节,导致重金属元素向深部的迁移和积累。
The distribution characteristics of Cu, Cr, Pb, Ni, Zn and Mn in the continuous fruit grove of Luochuan highland for 40 years were studied. The results showed that the contents of Cr, Pb, Ni, Zn and Mn in the apple orchard of Luochuan Plateau were all the same in the upper and lower parts of the apple orchard, but lower in the lower part than in the upper part. Although the contents of Cu, Cr, Pb, Ni, Zn and Mn did not exceed the soil environmental quality standards, they were all higher than the regional background values and the elements accumulated in the soil. The main reason is the destruction of the soil structure caused by human activities and the management of fertilizing and spraying of orchards, leading to the migration and accumulation of heavy metal elements to the deep.