目的为揭示土壤各粒级团聚体组分理化性质及其对镉(Cd)赋存形态的影响机制,研究典型水稻土团聚体分布特征及不同粒径团聚体对Cd环境行为的影响。方法选取Cd污染水稻土麻砂泥田(花岗岩发育)与鳝泥田(板页岩发育),通过湿筛法将土壤团聚体分为4个粒级:大团聚体(2~8 mm)、中间团聚体(0.25~2 mm)、微团聚体(0.053~0.25 mm)和粉黏粒(<0.053 mm),分析不同粒径团聚体去除有机质与游离态氧化铁对Cd的吸附作用。结果2种土壤均以大团聚体为主,鳝泥田团聚体结构较麻砂泥田稳定 ...
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