天津市郊区果园土壤重金属镉污染状况调查试验研究

Study and Investigation on Orchard Soil Cadmium Contamination Status in Tianjin District

选择代表性较强的北辰区韩家墅桃园、杏园,西青区大柳滩的葡萄园、梨园进行了调查研究。分析了这两个地区的基础养分情况,重点对重金属镉采用原子吸收法测定其含量,利用单因子评价法对果园重金属镉的污染情况进行了评价。结果表明,北辰区镉污染属重度污染,西青区属轻度污染;镉在石灰性土壤中移动性很小,主要在土壤表层累积;随着果园园龄的增长,镉的积累日益加重;同一地区,果树种类对土壤镉含量影响不大,主要与区域和对果园的管理有关。

This experiment carried out investigation and study on the peach and apricot orchard in Beichen Hanjiashu and the pear orchard and vineyard in Xiqing Daliutan. It determined two districts＇ basic nutrients situation and especially analyzed the cadmium content by the atomic absorption spectrophotometry and appraised the cadmium contamination situation in orchard soil by single factor evaluation method. The results showed that the Cd pollution in Beichen district belonged to serious state and light in Xiqing district.Cd didn＇t moved sightly in lame soil, it accumulated on surface soil. With the increase of orchard ages, the Cd accumulation was more seriously. In the same area, the fruit varieties don ＇t affect soil Cd content, mainly related to regional and orchard management.