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[1]ZHANG Jiachun,ZENG Xianping,ZHANG Zhenming,et al.Characteristics and Evaluation of Speciation of Heavy Metals in Forest Soils of Karst[J].Research of Soil and Water Conservation,2019,26(06):347-352,358.

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Characteristics and Evaluation of Speciation of Heavy Metals in Forest Soils of Karst

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 347-352,358 Column: Public date: 2019-10-17

Title:: Characteristics and Evaluation of Speciation of Heavy Metals in Forest Soils of Karst

Author(s):: ZHANG Jiachun¹, ZENG Xianping², ZHANG Zhenming³, WEN Ximei⁴, ZHANG Qinghai⁵, LIN Changhu⁵; 1. Guizhou Botanical Garden, Guiyang 550004, China;
2. Zunyi Center Station of Environmental Protection and Monitoring, Zunyi, Guizhou 563000, China;
3. Guizhou Institute of Biology, Guiyang 550009, China;
4. Research Institute of Mountain Resources and Environment in Guizhou, Guiyang 550002, China;
5. Guiyang Medical University, Guiyang 550025, China

Keywords:: karst; soil pH value; heavy metals; bioavailability; speciation analysis

CLC:: X53;S714

DOI:: -

Abstract:: The field survey and indoor analysis were carried out to investigate the characteristics of total contents and the speciation of heavy metals in forest soil of Karst, to evaluate the heavy metal contamination and the bioavailability of heavy metals in soil, and to discuss and analyze the correlation between heavy metal and soil pH value. The results showed that the total contents of As, Cd, Cu, Ni, Pb, Zn and Cr in neutral soil were higher than those in acid soil, As mainly occurred in acid soluble fraction, Cd, Cu, Ni, Pb, Zn and Cr mainly occurred in residual fraction, and the proportion of residual fraction of heavy metal in neutral soil was higher than that in acid soil; the total contents of Pb in acid and neutral soils were higher than the soil background value in Guizhou Province, and the total contents of As and Cu in neutral soil were higher than the soil background values in Guizhou Province; the total contents of As, Cd and Ni in neutral and acid soil were higher than the secondary standard values of soil environmental quality, the total content of Cu in acid soil was higher than the secondary standard values of soil environmental quality. The comprehensive pollution index showed that the acid soil was slightly polluted, the neutral soil was moderately polluted. The bioavailability of heavy metals decreased in the order:As > Cd > Cr > Ni > Pb > Zn > Cu, the bioavailability of As in acid soil was the highest, and the bioavailability of heavy metals in acid soil was higher than that in neutral soil. The total content of Cu, the oxidizable fraction of Pb, the residual fraction of Cu were extremely significantly positively correlated with soil pH value, the acid soluble fraction of Zn was extremely significantly negatively correlated with soil pH value, the acid soluble fraction of Cr was significantly negatively correlated with soil pH value, and the residual fraction of As was significantly positively correlated with soil pH value. The forest soil in karst was mainly affected by As, Cd, Cu and Ni. Except As, the other three soil heavy metals belong to the state of high environmental background and low activity.

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