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%.
soilpaddy-upland rotationagricultural landenvironmental monitoringpHorganic matterheavy metal
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