有机肥-蚯蚓对重金属活性、生物有效性和浸出性的影响
Heavy metal availability, bioaccessibility, and leachability in contaminated soil: effects of pig manure and earthworms
作者：李风，李志安，庄萍（通讯作者）等
Abstract
A pot
experiment and a leaching experiment were conducted to investigate the effects
of earthworms and pig manure on heavy metals (Cd, Pb, and Zn) immobility, in
vitro bioaccessibility and leachability under simulated acid rain (SAR).
Results showed manure significantly increased soil organic carbon (SOC),
dissolved organic carbon (DOC), available phosphorus (AP), total N, total P and
pH, and decreased CaCl2-extractable metals and total heavy metals in water and
SAR leachate. The addition of earthworms significantly increased AP (from 0.38
to 1.7 mg kg−1), and a downward trend in CaCl2-extractable and total
leaching loss of heavy metals were observed. The combined earthworm and manure
treatment decreased CaCl2-extractable Zn, Cd, and Pb. For Na4P2O7-extractable
metals, Cd and Pb were decreased with increasing manure application rate.
Application of earthworm alone did not contribute to the remediation of heavy
metal polluted soils. Considering the effects on heavy metal immobilization and
cost, the application of 6% manure was an alternative approach for treating
contaminated soils. These findings provide valuable information for risk
management during immobilization of heavy metals in contaminated soils.
Keywords Metal availability . Leachability . Bioaccessibility . Pigmanure compost . Earthworm . Simulated acid rain
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