摘  要

通过实地调查，对蒙自草坝棚龄为2a、4a、5a的蔬菜大棚内土壤进行采样分析，研究了当地大棚内土壤重金属元素的含量状况及其随棚龄的变化趋势。结果表明，(1)与露地土壤作比较，大棚内土壤中Zn、Pb、Cd的含量随着棚龄的增加而增加，其中，Zn的含量与对照相比变化显著，Pb、Cd的变化不显著。Cu的含量随着棚龄的增加而减少，2a、4a棚龄的变化显著，5a棚龄的变化不显著。(2)研究地区的土壤除Pb的含量未超标外，Zn、Cu、Cd均出现了不同程度的重金属污染，其中，Cd的污染情况最为严重。

关键词：设施土壤；棚龄；重金属含量

ABSTRACT

　　　Through field investigation, soils of vegetablegreenhouses 2 ,4and 5 years old have been collected and analysised that Contents of heavy metal elements in soils and its trend with age shed. The results showed that different heavy metal elements showed different tendencies in variation ;the contents of heavy metal elements of Zn,Pb,Cd with the shelf age increased.But the content of heavy metal elements of Cu decreased with increasing age shed, Pb,s content in soil is not exceeded the standards, others are exceeded the standards, which, Cd pollution was most serious.

Key words: Greenhouse soil; Age of utilization; Contents of heavy metal