【摘要】 土壤母质和pH是影响土壤重金属变化的重要因素,以江西某地区一般农田为对象,共采集1 392份0～20 cm表层土壤,分析了不同类型的土壤母质和pH与土壤重金属Cr、Pb、Cd、As和Hg的相互关系,为农田土壤重金属管控及修复治理提供参考。结果表明:第四纪红黏土发育的土壤重金属含量均较高,紫红色砂页岩风化物发育的土壤重金属均较低,而土壤pH较高,近代河湖冲积物发育的土壤pH和Cd含量较低,但土壤Hg和As含量偏高;土壤重金属在pH>7.5时含量最低,土壤Cr、Pb和Cd含量在pH<4.5时最高,土壤As在pH为5.5～6.5时含量最高,土壤Hg在pH为4.5～5.5时含量最高。土壤母质、pH及二者交互作用对土壤重金属Cr、Cd和As的影响均达到显著水平(P<0.05),其中土壤Pb和Hg受土壤母质影响大,土壤Cr、Cd和As受土壤pH影响大。更多还原

【Abstract】 Soil parent material and p H are important factors for the change of soil heavy metals.A total of 1 392 soils( 0 ～ 20 cm) were collected for general farmland in a certain area of Jiangxi province.The relationship between different types of soil parent material,p H and soil heavy metals( Cr,Pb,Cd,As and Hg) was analyzed.The study provide a reference for farmland soil heavy metal management and rehabilitation.The results showed that the content of heavy metals in the quaternary red clay was higher.The purple-red sand shale weathered soils have lower heavy metals and higher soil p H. The soil p H and Cd of alluvial deposits developed in modern times were low,but the soil Hg and As were relatively high.Soil heavy metals were lowest at p H>7. 5,soil Cr,Pb and Cd were highest at p H<4. 5,soil As was highest at p H 5. 5 ～ 6. 5,and soil Hg was highest at p H 4. 5 ～ 5. 5.The effects of soil parent material,p H and their interaction on soil heavy metals( Cr,Cd and As) all reached significant levels( P < 0. 05). Soil Pb and Hg were greatly affected by soil parent material.The soil Cr,Cd and As were greatly affected by soil p H.更多还原