临安山核桃主产区林地土壤重金属生态风险评价

doi:10.11720/wtyht.2019.0287

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Abstract

Through investigation and sampling Carya cathayensis kernels and soil of plantations, the heavy metals, Se, organic matter and other indicators in soil were analyzed, and the pollution degrees of heavy metals in soil were evaluated with risk screening values as the criteria. The content of heavy metals, Se, Ge and other trace components in kernels was analyzed, and the relationship between soil and kernels was discussed. The results show that the average values of Cu, Pb, Zn, Ni, Cr, Cd, As, Hg and Se in the soil of Carya cathayensis plantations are higher than those of the average soil of China, especially Cd is 5.6 times that of the average soil of China. Local soil Cd and As in the study area have reached the pollution level while the ecological risk of other heavy metals is slight. Carya cathayensis kernels have low Cd, Hg, Pb, As and other heavy metals content, no excessive heavy metal elements, low ecological risk, and high zinc content, with the potential to develop zinc-rich health food. Carya cathayensis has a significant difference in the absorption capacity of different heavy metals. The absorption capacity of zinc and copper is much greater than that of Cd, Cr and Hg.

Key words： soil heavy metals ecological risk Carya cathayensis Lin'an

Received: 20 May 2019 Published: 28 November 2019

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	Dao-Rong LIU
	Ji-Zi ZHENG
	Xuan ZHAN
	Wen-Dan WU

Cite this article:

Dao-Rong LIU,Ji-Zi ZHENG,Xuan ZHAN, et al. Ecological risk evaluation of heavy metals in soils of Carya cathayensis plantations, Lin'an[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1382-1388.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0287 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1382

Geological background and sampling sites of Lin'an area (modified after Lin'an geology sketch map(1:100 000))

Analytical method and detection limit of soil geochemical indicators

Statistical parameters of element contents in surface soils of Lin'an area(n=32)

Correlation coefficient between heavy metals and physico-chemical properties in soil(n=32)

Average concentrations of elements in surface soils of study area with different geological settings

Evaluated results of single factor pollution index for soil heavy metals

Overall evaluation results of soil heavy metals in study area

Contents of trace elements in Carya cathayensis kernels

The BCFs of some heavy metals in Carya cathayensis kernels

Relationship between the contents of Zinc in Carya cathayensi kernels and soil

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