| Soil heavy metal background values and pollution degree in southern Songnen Plain of Heilongjiang Province |
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| DOI：10.7606/j.issn.1000-7601.2018.06.34 |
| Key Words: heavy metals background levels soil pollution Songnen Plain |
| Author Name | Affiliation | | ZHANG Hui | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | MA Xin-peng | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | SU Hang | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | SUI Hong-jun | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | SHI Xiao-lei | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | LI Xin-yang | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | YANG Huan | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | ZHENG Zhi-zhi | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: |
| Songnen Plain is one of the important commodity grain production regions in China. It is of great practical significance for the agricultural production, food security, and soil protection in the Songnen Plain to determine the heavy metal background level in soil and better understand the soil pollution. In this paper, we took the southern part of Songnen Plain in Heilongjiang Province as the research area with the data of regional multi-objective geochemical survey, employed confidence interval method, cumulative frequency method, iterative elimination method, and ordinary Kriging interpolation method to determine the heavy metal (As, Hg, Cd, Cr, Cu, Ni, Pb, and Zn) background levels in soil and its spatial distribution in the region. We also used cumulative index method to determine the pollution degree of heavy metals. The results showed that, the background levels of As, Hg, Cd, Cr, Cu, Ni, Pb, and Zn, in the southern part of Songnen Plain in Heilongjiang Province were 9.330, 0.016, 0.079, 50.817, 18.741, 24.159, 22.702, and 57.339 mg·kg-1, respectively. The results from ordinary Kriging interpolation indicated that the distributions of As, Cd, Cr, Cu, Ni, and Zn in the deep soil were relatively consistent, a spatial distribution pattern of high in southwestern and low in southwestern parts, and a relatively uniform distribution of Hg and Pb in the study area. The heavy metal background levels in soil in the southern Songnen Plain of Heilongjiang were used as the evaluation standard, and the degree of heavy metal pollution in the surface soil was analyzed by the cumulative index method. It is showed that number of samples with less than standard levels (defined as uncontaminated) of As, Hg, Cd, Cr, Cu, Ni, Pb, and Zn were 97.72%, 59.92%, 83.45%, 97.63%， 99.24%, 98.86%, 99.02%, and 99.26% of the total samples, respectively, soil in the study area was generally not polluted and only a small portion of the soils was at a moderate degree of Hg and Cd pollution. |
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