Contents of heavy metals in soils and crops in the demonstration area of karst rocky desertification control of the Karst Plateau-Gorge
YAO Cheng-bin1, ZHOU Ming-zhong1, XIONG Kang-ning2, ZHANG Di1, YANG Hua1, ZHANG Xian-rong1, YANG Lian-sheng1
1. School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China; 2. Research Institute of Karst, Guizhou Normal University, Guiyang 550001, China
Abstract：In this study, we collected samples of agriculture soils and dominant crops in Salaxi of Bijie Guizhou Province, and analyzed the contents of heavy metals Cr, Co, Cu, Cd, Pb, Zn, As, and Ni in soil and crop samples. The enrichment factor were calculated to assess the pollution status of soils and crops. Furthermore, the potential ecological risk index (RI) and bioconcentration coefficient were used to evaluate the potential ecological risk of soil heavy metals and the characteristics of crops' heavy metal enrichment in the demonstration area.The results showed that the average contents of Cr, Co, Cu, Cd, Pb, Zn, As, and Ni in the soil of the demonstration area were 123, 28.0, 67.8, 1.52, 32.7, 132, 25.6, and 56.5mg/kg, all elements are below the risk screening values for soil contamination of agricultural land, except Cd. Among them, the evaluation grade of heavy metal pollution in forest soil is non-pollution-slight pollution, individual samples of Cd and Cu in dry land soil have moderate pollution, and the others are non-pollution-light pollution. The results of potential ecological risk assessment showed that the moderate ecological risk was posed by Cd. Followed by Cr, Co, Cu, Pb, Zn, As and Ni were all of low ecological risk, and the comprehensive ecology of 8heavy metals the risk level is minor ecological risk.Meanwhile,the bioconcentration factor of Cd in potatoes is 4.05, and the enrichment factor of other heavy metals is less than 2.Through this study, we can know that different crops have different heavy metal enrichment capacities in the soil. Among them, Cd, Zn, Co, Cu, Pb and Ni have relatively high migration and enrichment capacities in the Soil-Potato system, Cr and As have relatively high migration and enrichment capacities in the Soil-Maize system, while the remaining crops have relatively weak heavy metal enrichment capacities.
姚成斌, 周明忠, 熊康宁, 张迪, 杨桦, 张先荣, 杨连升. 喀斯特高原石漠化治理示范区土壤和农作物重金属含量特征[J]. 中国环境科学, 2021, 41(1): 316-326.
YAO Cheng-bin, ZHOU Ming-zhong, XIONG Kang-ning, ZHANG Di, YANG Hua, ZHANG Xian-rong, YANG Lian-sheng. Contents of heavy metals in soils and crops in the demonstration area of karst rocky desertification control of the Karst Plateau-Gorge. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 316-326.
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