Combining Soil Immobilization and Dressing Techniques for Sustaining the Health of Metal-Contaminated Arable Soils

Author:

Yoon Jung-Hwan1ORCID,Lee Chan-Gyu1,Park Byung-Jun1,Jeong Seok Soon1ORCID,Lee Young Don1,Kirkham Mary Beth2,Kim Kwon-Rae3,Yang Jae E.1ORCID,Park Yong-Ha4,Kim Sung Chul5,Kim Hyuck Soo1

Affiliation:

1. Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea

2. Department of Agronomy, Kansas State University, Manhattan, KS 66506, USA

3. Department of Smart Agro-Industry, Gyeongsang National University, Jinju 52725, Republic of Korea

4. Korea Environment Institute, Sejong 30147, Republic of Korea

5. Department of Biological Environmental Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea

Abstract

The combination of lime immobilization of metals and soil dressing has been a prevalent practice in Korea for remediating metal-contaminated arable soils. However, there have been limited reports on whether this method effectively sustains soil health after remediation, particularly in arable soils. This study undertook a comparative assessment of the soil health index (SHI) across metal-contaminated arable lands, arable soils remediated with lime immobilization and soil dressing, and uncontaminated soils. A total 389 soil samples were collected from these sites and analyzed for nineteen indicators encompassing physical, chemical, and biological properties. To assess soil health, these indicators were screened using principal component analysis, yielding five minimum data set (MDS) indicators: total nitrogen, clay content, dehydrogenase activity, bacterial colony-forming units, and available phosphorus. Among these MDS indicators, total nitrogen exhibited the highest value as the principal component contributing to soil health assessment. Scores of the MDS indicators exhibited significant correlation with those of total data set indicators, affirming the appropriateness of the soil health assessment adopted in this study. The SHI of the remediated arable soils (0.48) surpassed those of the contaminated soils (0.47) and were statistically comparable to those of the uncontaminated forest (0.51) and upland (0.51) soils. The health of the contaminated soils demonstrated a high dependence on soil properties rather than metal concentrations. These findings underscore the robustness of the combined immobilization and soil dressing method for sustaining the health of contaminated arable soils post-remediation.

Funder

Korea Ministry of the Environment

Korea Ministry of Environment, with the strategic EcoSSSoil Project, Korea Environmental Industry and Technology Institute, Korea

2021 Research Grant from Kangwon National University

Kansas State University Organized Research Fund

Publisher

MDPI AG

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