大气干湿沉降重金属元素通量及对农田土壤的影响——以四川崇州为例

doi:10.11720/wtyht.2025.1118

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Abstract

It shows that atmospheric deposition is one of the main sources of soil heavy metal pollution. In order to find out the effects of atmospheric wet and dry deposition on farmland soil, the accumulation of heavy metals in farmland soil was analysed by monitoring the dry and wet deposition in the study area and testing the heavy metal content, estimating the dry and wet deposition flux, heavy metal change rate and potential ecological risk assessment. The results showed that the heavy metal content of dry and wet sediment exceeded the content of Cd, Pb and Zn in the surrounding soil, and Cd and Zn exceeded the soil pollution screening value of agricultural land by 2.25 times and 1.09 times;The annual flux of heavy metal elements in the dry and wet precipitation of the atmosphere is smaller than the national average, and the sedimentation flux order is Zn>Cr>Pb>Cu>Ni>As>Cd>Hg, the annual sedimentation flux of Zn is the highest, and the sedimentation flux of Cd is low. The geo-accumulation index showed that in the atmospheric dust, Cd reached extremely high pollution level, followed by Hg, Pb, there was no As and Ni pollution. The heavy metals with the most significant impact of atmospheric dry and wet sediment on soil were Cd and Zn, with an increase of 0.421 mg/kg and 104.653 mg/kg after one year, and the annual change rates reached 0.138% and 0.146%, which indicated that the atmospheric deposition was one of the most important sources of the heavy metal Cd and Zn in the farmland soil. The sedimentation flux of Cd is low, but its content exceeded the standard the most, and caused the most significant changes in the soil environment, which needs to be paid attention to.

Key words： atmospheric dry and wet deposition heavy metals deposition flux pollution evaluation soil accumulation

Received: 26 March 2024 Published: 22 July 2025

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	Jiao-Long YE
	Hong-Mei ZHONG
	Zheng-Qiang XU
	Chan-Hua MA

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Jiao-Long YE,Hong-Mei ZHONG,Zheng-Qiang XU, et al. Flux of heavy metals in atmospheric dry and wet precipitation and their effects on farmland soil: A case study of Chongzhou,Sichuan[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 708-717.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1118 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/708

Distribution map of atmospheric dry and wet deposition monitoring samples

The content of heavy metals deposed by dry and wet precipitation in the study area mg/kg

The flux of heavy metals in atmospheric dry and wet deposition mg/(m²·a)

Comparison of flux changes of heavy metals in atmospheric deposition

The ratio of the precipitation to the dissolved fraction of heavy metals in atmospheric deposition

Geochemical map of annual flux of atmospheric heavy metal deposition of dry and wet

Geo-accumulation index of heavy metals in atmospheric deposition

Features of geo-accumulation index

The amount of changes of heavy metals in the soil after one year of dry and wet precipitation mg/kg

The annual variation rate of heavy metals in soil caused by atmospheric dry and wet deposition

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