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Planular-vertical distribution and pollution characteristics of cropland soil Hg and the estimated soil-air exchange fluxes of gaseous Hg over croplands in northern China
Wang, Chunjie; Wang, Zhangwei; Gao, Yu; Zhang, Xiaoshan
2021-4-
Source PublicationENVIRONMENTAL RESEARCH
ISSN0013-9351
Volume195Pages:-
AbstractAs an important reservoir of mercury (Hg), cropland play an important role in the Hg cycle, but it was poorly understood in northern China. The major objectives of this study are to ascertain the distribution characteristics of soil Hg and then assess its pollution level and potential risk, and further evaluate the role of cropland in northern China in the global soil-air exchange of Hg based on the simulation experiments and regional survey. The average Hg concentration in surface soils of the 30 sites in northern China was 116.1 +/- 135.8 ng g(-1), which was significantly higher than background values. The surface soils show a significant spatial heterogeneity in Hg concentration, and the Hg levels near provincial capitals were higher than those at corresponding prefecture-level cities, revealing that the soil Hg levels were closely associated with the local industrial and economic development. Profile data shows that topsoil Hg concentration was significantly higher than those in deeper layers at most of sites, indicating the more serious pollution situation in recent years. Generally, the higher the surface soil Hg concentration, the more obvious this top-bottom decreasing trend. The planular-vertical distribution patterns of TOM share similar trends as those of soil Hg concentration, indicating Hg concentration was closely associated with TOM content. Statistical results show that the mean CF, E-r(i), and I-geo values were 4.0 +/- 5.0, 161 +/- 198, 0.76 +/- 1.34, respectively, and more than two thirds of sampling sites were moderately and considerably polluted. The mean annual accumulative flux of Hg in the northern China was 20.9 +/- 43.8 mu g m(-2) yr(-1), and the total net emission fluxes of Hg from the croplands in six provinces were 8.37 ton yr(-1). This indicates that although the cropland occasionally acts as a sink, it represents an important natural source of atmospheric Hg as a whole.
Department城市与区域生态国家重点实验室
KeywordCroplands Mercury Risk assessment Soil-air flux Natural sources Northern China
WOS Research AreaEnvironmental Sciences ; Public, Environmental & Occupational Health
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45535
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, 18 Shuangqing Rd, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Chunjie,Wang, Zhangwei,Gao, Yu,et al. Planular-vertical distribution and pollution characteristics of cropland soil Hg and the estimated soil-air exchange fluxes of gaseous Hg over croplands in northern China[J]. ENVIRONMENTAL RESEARCH,2021,195:-.
APA Wang, Chunjie,Wang, Zhangwei,Gao, Yu,&Zhang, Xiaoshan.(2021).Planular-vertical distribution and pollution characteristics of cropland soil Hg and the estimated soil-air exchange fluxes of gaseous Hg over croplands in northern China.ENVIRONMENTAL RESEARCH,195,-.
MLA Wang, Chunjie,et al."Planular-vertical distribution and pollution characteristics of cropland soil Hg and the estimated soil-air exchange fluxes of gaseous Hg over croplands in northern China".ENVIRONMENTAL RESEARCH 195(2021):-.
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