云南省者竜—嘎洒地区Cr、Ni地球化学特征及土壤污染风险防控建议

doi:10.11720/wtyht.2021.1032

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Abstract

Based on the land quality geochemical survey data obtained in the Zhelong-Gasa area, Yunnan Province, the authors studied geochemical characteristics and main influencing factors of Cr and Ni in surface soil and analyzed Cr and Ni content characteristics of agricultural products. The results show that the content of Cr and Ni in the surface soil is mainly controlled by the geological background. The content of Cr and Ni in the soil developed in the Guangshan-Pingyakou rock mass (σ) of the study area is significantly higher than that in other strata. The medium values of Cr and Ni in different types of soils are quite different, and land use also affects the content of Cr and Ni in the soil. The Cr and Ni values of agricultural products such as corn, citrus, tea, sugarcane, bananas, and walnuts in the study area do not exceed the food safety standards. Only the values of 11 rice Cr samples exceed the Cr content standards set by national standards,accounting for 11.3% of the total rice samples. The overall evaluation of agricultural products in this area shows safety. The area of agricultural land such as paddy field, dry land, garden land and grassland in this area is 554.73 km², of which, the area of safety area is 408.61 km², accounting for 73.66%, the area of risk area is 112.96 km², accounting for 20.36%, and the area of control area is 33.16 km², accounting for 5.98%.For some areas with soil Cr and Ni pollution risk, measures are proposed such as soil and water conservation, fertilization adjustment, and water-dry rotation to prevent and control pollution risks.

Key words： Zhelong Gasa Cr, Ni geochemical characteristics land quality geochemical survey land pollution risk prevention and control

Received: 15 January 2020 Published: 29 April 2021

ZTFLH:

P632

Corresponding Authors: HUANG Zhao E-mail: 1719702709@qq.com;151230199@qq.com

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	Articles by authors
	Song WU
	Zheng CHEN
	Yuan-Bin LI
	Zhao HUANG
	Lin ZHANG
	Sheng-Chao XU
	Kai-Gui WANG

Cite this article:

Song WU,Zheng CHEN,Yuan-Bin LI, et al. Cr and Ni geochemistry and some suggestions on soil pollution risk prevention control in the Zhelong-Gasa area, Yunnan Province[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 517-527.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1032 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/517

Geological map in study area

Analytical methods,detection limits and analytical standards

Statistical parameters of chromium and nickel contents in top soil

Chromium and nickel average in rocks and top soils as well as secondary enrichment factor of top soil vs rock

Fig.1)
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Geochemical distribution of nickel(a) and chromium(b) in the surface soil of the study area(the legend is the same as Fig.1)

The average concentration of chromium and nickel in different soil types

The mean values of chromium and nickel contents in different land use

The mean values maps of chromium and nickelelemental contents in soil of different elevation

The risk assessment of chromium pollution of different land use types

The risk assessment of nickele pollution of different land use types in the survey area

The chromium and nickele content of main agricultural products in survey area

The mean values maps of nitrogen and potassium oxide elemental contents in different soil acidity

The mean values of soil acidity in different land use

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