辽宁盘锦市农田土壤重金属元素时空变化研究

Study on Spatial-temporal Variation of Heavy Metal Elements Contents in Soil from the Farming Area in Panjin City,Liaoning

以辽宁盘锦市两期土地质量地球化学调查数据为依据,通过数理统计、多元统计分析、空间分析等方法,消除了采样和分析误差的影响,研究了该区土壤重金属元素时空变化规律,并结合土地利用现状讨论了土壤中重金属元素累积的原因。结果表明,在2004—2009年这段时间内,土壤中重金属元素Cd含量呈现明显增加趋势,净平均累积率达到31.28%。造成该元素累积的原因主要为农业活动和人类活动,同时人类活动还造成了局部地区As、Zn等元素的累积;Cu、Hg呈明显的贫化趋势;Pb具有富集和贫化的双重性质,Cr、Ni、p H值在此期间变化不明显。

Based on twice geochemical survey data about land quality in Panjin City of Liaoning,the characteristics of spatial-temporal variation of heavy metal elements in this area were studied by applying scientific statistical method（ i. e. mathematical statistics,multivariate statistical analysis,spatial analysis） to eliminate errors in sampling and analyzing,and the reasons for accumulation of heavy metal elements in soil were discussed combining present situation of land use. The results showed that the element contents of cadmium（ Cd） in soil have been markedly increased from 2004 to 2009,with an average cumulative rate of 31. 28%,which mainly contributed by agricultural and human activity. Meanwhile,human activity also caused accumulation of some other heavy metal elements,e. g. arsenic（ As）,zinc（ Zn）. On the contrary,copper（ Cu） and mercury（ Hg）presented apparent depleted trend. Lead（ Pb） showed double characteristics of either enrichment or depletion,while the contents of chromium（ Cr） and nickel（ Ni） had no significant changes as well as the p H value.