摘要
在水旱轮作模式下分水作和旱作2次采样分析了土壤pH、有机质含量及重金属污染物的分布变化规律.结果表明,水旱轮作情形下,水作pH、有机质含量比旱作整体偏高,偏高点位占比分别为85.7%、76.2%;重金属砷、铅、铜、镍、锌含量旱作比水作高,偏高的点位占比分别为61.9%、88.1%、64.3%、76.2%、69.0%,仅铬含量水作比旱作高,偏高的点位占比为71.4%.与旱作相比,水作pH中位值高0.55,增幅为8.0%,有机质含量中位值高9.6 g/kg,增幅为35.6%,砷、铅、铜、镍和锌含量中位值分别下降8.2%、9.2%、11.7%、7.8%、4.8%,而铬含量中位值则增加了14.3%.
Abstract
The distribution changes of soil pH,organic matter content and heavy metal pollutants in paddy fields and dry fields under the paddy-upland rotation were studied.The results showed that the pH and organic matter content in paddy fields were generally high-er than those in dry fields,accounting for 85.7%and 76.2%respectively.The contents of heavy metals such as As,Pb,Cu,Ni and Zn were higher in dry fields than in paddy fields,accounting for 61.9%,88.1%,64.3%,76.2%and 69.0%,respectively.Only Cr con-tent was higher in paddy fields than in dry fields,accounting for 71.4%.Compared with dry fields,the soil pH median value in paddy fields had increased by 0.55,with an increase of 8.0%,the soil organic matter median content in paddy fields had increased by 9.6 g/kg,with an increase of 35.6%,and the median content of As,Pb,Cu,Ni and Zn in paddy fields had decreased respectively 8.2%,9.2%,11.7%,7.8%and 4.8%,while Cr median content increased by 14.3%.
维普
万方数据