Modelling Hg mobility in podzols: Role of soil components and environmental implications
| العنوان: | Modelling Hg mobility in podzols: Role of soil components and environmental implications |
|---|---|
| المؤلفون: | Cruz Ferro-Vázquez, Antonio Martínez-Cortizas, Juan Carlos Nóvoa-Muñoz, Antía Gómez-Armesto, Manuel Arias-Estévez, Melissa Méndez-López |
| المصدر: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| بيانات النشر: | Elsevier, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, Health, Toxicology and Mutagenesis, Environmental Sciences & Ecology, 010501 environmental sciences, Forests, Podzolization, Toxicology, 01 natural sciences, Soil, Soil Pollutants, 0105 earth and related environmental sciences, Horizon (geology), PCA, Chemistry, Soil organic matter, General Medicine, Mercury, Pollution, Podzol, Regression, Europe, Total hg, Environmental chemistry, Soil water, Cycling, High-resolution soil sampling, Hg pools, Environmental Monitoring |
| الوصف: | A high-resolution soil sampling has been applied to two forest podzols (ACB-I and ACB-II) from SW Europe in order to investigate the soil components and processes influencing the content, accumulation and vertical distribution of Hg. Total Hg contents (THg) were 28.0 and 23.6 mu g kg(-1) in A horizons of ACB-I and ACB-II, then they strongly decreased in the E horizons and peaked in the Bhs horizons of both soils (55.3 and 63.0 mu g kg(-1)). THg decreased again in BwC horizons to 17.0 and 39.8 mu g kg(-1). The Bhs horizons accounted for 46 and 38% of the total Hg stored (ACB-I and ACB-II, respectively). Principal component analysis (PCA) and principal components regression (PCR), i.e. using the extracted components as predictors, allowed to distinguish the soil components that accounted for Hg accumulation in each horizon. The obtained model accurately predicted accumulated Hg (R-2 = 0.845) through four principal components (PCs). In A horizons, Hg distribution was controlled by fresh soil organic matter (PC4), whereas in E horizons the negative values of all PCs were consistent with the absence of components able to retain Hg and the corresponding very low THg concentrations. Maximum THg contents in Bhs horizons coincided with the highest peaks of reactive Fe and Al compounds (PC1 and PC2) and secondary crystalline minerals (PC3) in both soils. The THg distribution in the deepest horizons (Bw and BwC) seemed to be influenced by other pedogenetic processes than those operating in the upper part of the profile (A, E and Bhs horizons). Our findings confirm the importance of soils in the global Hg cycling, as they exhibit significant Hg pools in horizons below the uppermost O and A horizons, preventing its mobilization to other environmental compartments. (C) 2020 Elsevier Ltd. All rights reserved. Xunta de GaliciaXunta de GaliciaEuropean Commission [ED481A-2016/220] FPU of Ministerio de Educacion y Formacion ProfesionalGerman Research Foundation (DFG)National Health and Medical Research Council of Australia [FPU17/05484] Conselleria de Cultura, Educacion e Ordenacion Universitaria (Xunta de Galicia)Xunta de Galicia [ED431C 2017/62-GRC, ED431F2018/06-EXCELENCIA, ED431E 2018/07] CITACA contract [08.CITACA-2019] info:eu-repo/semantics/publishedVersion |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1aa4d9a2e3872543a36c55cff529509a https://hdl.handle.net/10400.1/16513 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....1aa4d9a2e3872543a36c55cff529509a |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |