title: Stability and heavy metal distribution of soil aggregates affected by application of apatite, lime, and charcoal.
abstract: Only a few studies have been reported on the stability and heavy metal distribution of soil aggregates after soil treatments to reduce the availability of heavy metals. In this study, apatite (22.3 t ha(-1)), lime (4.45 t ha(-1)), and charcoal (66.8 t ha(-1)) were applied to a heavy metal-contaminated soil for 4 years. The stability and heavy metal distribution of soil aggregates were investigated by dry and wet sieving. No significant change in the dry mean weight diameter was observed in any treatments. Compared with the control, three-amendment treatments significantly increased the wet mean weight diameter, but only charcoal treatment significantly increased the wet aggregate stability. The soil treatments increased the content of soil organic carbon, and the fraction 0.25-2 mm contained the highest content of soil organic carbon. Amendments' application slightly increased soil total Cu and Cd, but decreased the concentrations of CaCl2 -extractable Cu and Cd except for the fraction <0.053 mm. The fractions >2 and 0.25-2 mm contained the highest concentrations of CaCl2-extractable Cu and Cd, accounted for about 74.5-86.8 % of CaCl2-extractable Cu and Cd in soil. The results indicated that amendments' application increased the wet soil aggregate stability and decreased the available Cu and Cd. The distribution of available heavy metals in wet soil aggregates was not controlled by soil aggregate stability, but possibly by soil organic carbon.
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, China.|Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy Sciences, Nanjing, 210008, China.
authors.forename: Hongbiao
authors.initials: H
authors.lastname: Cui
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, China.
authors.forename: Kaiqiang
authors.initials: K
authors.lastname: Ma
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, China.
authors.forename: Yuchao
authors.initials: Y
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy Sciences, Nanjing, 210008, China.
authors.forename: Xinhua
authors.initials: X
authors.lastname: Peng
authors.affiliation: Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA, 23529, USA.
authors.forename: Jingdong
authors.initials: J
authors.lastname: Mao
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy Sciences, Nanjing, 210008, China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy Sciences, Nanjing, 210008, China.
authors.forename: Zhongbin
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy Sciences, Nanjing, 210008, China. zhoujing@issas.ac.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
mesh_terms: D001031:Apatites / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis / Q000737:chemistry*; D002122:Calcium Chloride / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation; D010087:Oxides / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D001031:Apatites; D017610:Calcium Compounds; D010087:Oxides; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D002606:Charcoal; D003300:Copper; C016538:lime; D002122:Calcium Chloride
keywords: Amendment; Heavy metal distribution; Soil aggregates stability; Soil organic carbon