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  • Title: [Enrichment Characteristics of Heavy Metals in Particulate Organic Matter of Purple Paddy Soil].
    Author: Li QY, Zhao XL.
    Journal: Huan Jing Ke Xue; 2017 May 08; 38(5):2146-2153. PubMed ID: 29965123.
    Abstract:
    Twenty purple paddy soil samples were collected from the Prefectures of Hechuan and Tongliang, Chongqing, and sieved into particulate organic matter (0.053-2 mm, POM), sand fraction (0.053-2 mm) and fine soil fraction (<0.053 mm). By comparing the concentration and distribution of soil organic carbon (SOC) and heavy metals among different components, the enrichment characteristics of POM for heavy metals (Cu, Zn, Pb and Zn) and its relationship with soil properties such as pH, CEC, clay content (<0.002 mm) and SOC were investigated. The result showed that the contents of POM fraction in purple paddy soils ranged from 7.31 to 44.76 g·kg-1, with an average level of 19.20 g·kg-1, while the carbon contents ranged from 96.61 to 263.17 g·kg-1, which were significantly higher than those of their original soils and other two fractions. The contribution rates of organic carbon by POM to the total organic carbon of soils ranged from 8.63% to 48.62%, which accounted for a large pool of organic carbon. The average enrichment factors of POM fraction to Cu, Zn, Pb and Cd were 3.35, 1.14, 2.88 and 2.14, respectively. Compared with sand fraction and fine soil fraction, POM fraction showed a significantly higher contribution rate to heavy metals, which were 6.02%, 2.22%, 5.24% and 3.21%. In addition, the enrichment ability and contribution rate of POM to Cu and Pb were obviously greater than those of Zn and Cd. There was a significant positive correlation between content of POM fraction and soil properties such as SOC, pH, CEC and clay content, in which SOC was the key factor. The POM-C content and total amount were significantly correlated with SOC and clay content. The pH value, SOC and POM-C amount had a significant or extremely significant correlation with the amount of heavy metals in POM, in which SOC was the most critical one. Comparing with other heavy metals, the amount of zinc in POM had the highest regression coefficient and the closest relationship with soil properties.
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