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Soil characterization and differential patterns of heavy metal accumulation in woody plants grown in coal gangue wastelands in Shaanxi, China

文献类型： 外文期刊

作者： Shi Yakun 1 ; Mu Xingmin 1 ; Li Kairong 4 ; Shao Hongbo 5 ;

作者机构： 1.Northwest A&F Univ, Inst Soil & Water Conservat, Xinong Rd 26, Yangling 712100, Shaanxi, Peoples R China

2.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Peoples R China

3.Minist Water Resources, Yangling 712100, Peoples R China

4.Northwest A&F Univ, Coll Nat Resource & Environm, Yangling 712100, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Agrobiotechnol, Nanjing 210014, Peoples R China

6.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China

关键词： Coal gangue wasteland;Heavy metal;Geoaccumulation index;Accumulation characteristic;Woody plant

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Soil contamination by heavy metals in coal mine wastelands is a significant environmental issue in most developing countries. The purpose of this study is to evaluate contamination characteristics in the coal mine wastelands of Sanlidong coal mine, Tongchuan, China. To achieve this goal, we conducted field sampling work, followed by further analysis of the properties of soil contamination and accumulation characteristics in woody plants. At this site, the pH value ranged from 4.41 to 7.88, and the nutrient content of the soil rose gradually with the time after deposition due to the weathering effect improving the soil quality. Meanwhile, the levels of Cd, Cr, Cu, Ni, and Zn gradually decreased with the passage time. Generally, heavy metal contamination was found to be more serious in the discharge refuse area, with Cd contamination at moderate or heavy levels; Ni, Zn, and Cu contamination at light levels; and with no Cr contamination. The geoaccumulation index (I (geo)) was highest for Cd (2.38-3.14), followed by Ni, Zn, Cu, and Cr. Heavy metals accumulated on the lower slopes and spread to the surrounding areas via hydrodynamic effects and wind. According to transfer and enrichment coefficient analyses, Robinia pseudoacacia, Ulmus pumila, and Hippophae rhamnoides with considerable biomass could be used as pollution-resistant tree species for vegetation restoration. This study provided a theoretical basis for the restoration of the ecological environment in the mining area. This report described a link between heavy metal contamination of soils and growth dynamics of woody plants in China.

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