Mercury distribution in the foliage and soil profiles of a subtropical forest: Process for mercury retention in soils

Du, Buyun; Zhou, Jun; Zhou, Lingli; Fan, Xingjun; Zhou, Jing

doi:10.1016/j.gexplo.2019.106337

Cited by 23 publications

(10 citation statements)

References 59 publications

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“…stand (conifer) with some associated species, including camphor (Cinnamom camphora) and Gugertree (Schima superba Gardn.) . A thin soil organic layer was in the subtropical forest due to humid weather and high temperatures.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…stand (conifer) with some associated species, including camphor (Cinnamom camphora) and Gugertree (Schima superba Gardn.). 31 A thin soil organic layer was in the subtropical forest due to humid weather and high temperatures. MDL is a mature and secondary forest dominated by deciduous and coniferous broad-leaved stands, e.g., Quercus liaotungensis, Betula platyphylla, Betula dahurica, and Chinese pine tabulaeformis.…”

Section: Methodsmentioning

confidence: 99%

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Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

Zhou

Wang

Zhang

et al. 2021

Environ. Sci. Technol.

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Solid–gas–water phase partitioning of mercury (Hg) and the processes governing its diffusivity within soils are poorly studied. In this study, landscape and forest species dependences of gaseous elemental Hg (Hg(0)) in soil profiles (0–50 cm) were investigated over four seasons in eight subtropical (130 days) and temperate (96 days) forest plots. The vertical soil pore Hg(0) concentrations differed between subtropical (Masson pine, broad-leaved forest, and open field) and temperate (Chinese pine, larch, mixed broad-leaf forests, and open field) catchments, with annual averages ranging from 6.73 to 15.8 and 0.95 to 2.08 ng m–3, respectively. The highest Hg(0) concentrations in soil gas consistently occurred in the upper mineral or organic horizons, indicating immobilization of Hg(0) in mineral soils. A strongly positive relationship between pore Hg(0) concentrations and ratios of Hg to organic matter (SOM) in soils suggests that the vertical distribution of Hg(0) is related to soil Hg(0) formation by Hg(II) reduction and sorption to SOM. Temperature was also an important driver of Hg(0) production in soil pores. Based on measurements of soil–air Hg(0) exchange, diffusion coefficients (D s) of Hg(0) between soil and atmosphere were calculated for field sites, providing a foundation for future development and validation of terrestrial Hg models.

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Section: Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

Zhou

Wang

Zhang

et al. 2021

Environ. Sci. Technol.

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“…However, some studies of snowpack have shown net Hg deposition at nighttime and net emissions during daytime due to high solar radiation (Maxwell et al, 2013;Spolaor et al, 2019). Empirical models suggest that most of the Hg(0) deposited to snow was re-emitted back to the atmosphere (Durnford and Dastoor, 2011). During the campaigns in winter, the solar radiation was relatively lower, which may be why net deposition occurred (Fig.…”

Section: Seasonal Variations In Soil-air Hg Fluxes At the Forest Catcmentioning

confidence: 99%

“…Soils account for more than 90 % of Hg stored in terrestrial ecosystems (Obrist, 2012), with global topsoil Hg pools (0-40 cm) estimated as being > 300 000 Mg (Hararuk et al, 2013;Zhou et al, 2017a). The large soil Hg pools stem not only from geologic sources but also from a legacy of historically anthropogenic emissions over the centuries (Obrist et al, 2014;Du et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Soil–atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments

et al. 2020

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Abstract. Evasion from soil is the largest source of mercury (Hg) to the atmosphere from terrestrial ecosystems. To improve our understanding of controls and in estimates of forest soil–atmosphere fluxes of total gaseous Hg (TGM), measurements were made using dynamic flux chambers (DFCs) over 130 and 96 d for each of five plots at a subtropical forest and a temperate forest, respectively. At the subtropical forest, the highest net soil Hg emissions were observed for an open field (24 ± 33 ng m−2 h−1), followed by two coniferous forest plots (2.8 ± 3.9 and 3.5 ± 4.2 ng m−2 h−1), a broad-leaved forest plot (0.18 ± 4.3 ng m−2 h−1) and the remaining wetland site showing net deposition (−0.80 ± 5.1 ng m−2 h−1). At the temperate forest, the highest fluxes and net soil Hg emissions were observed for a wetland (3.81 ± 0.52 ng m−2 h−1) and an open field (1.82 ± 0.79 ng m−2 h−1), with lesser emission rates in the deciduous broad-leaved forest (0.68 ± 1.01 ng m−2 h−1) and deciduous needle-leaved forest (0.32 ± 0.96 ng m−2 h−1) plots, and net deposition at an evergreen pine forest (−0.04 ± 0.81 ng m−2 h−1). High solar radiation and temperature during summer resulted in the high Hg emissions in the subtropical forest and the open field and evergreen pine forest at the temperate forest. At the temperate deciduous plots, the highest Hg emission occurred in spring during the leaf-off period due to direct solar radiation exposure to soils. Fluxes showed strong positive relationships with solar radiation and soil temperature and negative correlations with ambient air TGM concentration in both the subtropical and temperate forests, with area-weighted compensation points of 6.82 and 3.42 ng m−3, respectively. The values of the compensation points suggest that the atmospheric TGM concentration can play a critical role in limiting TGM emissions from the forest floor. Climate change and land use disturbance may increase the compensation points in both temperate and subtropical forests. Future research should focus on the role of legacy soil Hg in reemissions to the atmosphere as decreases in primary emissions drive decreases in TGM concentrations and disturbances of climate change and land use.

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“…The Hg in plant foliage comes mainly from the air, because Hg uptake from the soil tends to be accumulated in the belowground biomass (i.e., the roots), and the translocation of this element above ground is poor [ 18 , 19 ]. For these reasons, the Hg concentration in the aboveground biomass of vascular plants is commonly used to assess air Hg pollution [ 17 , 20 ]. Climatic conditions such as temperature, light, wind, turbulence, and humidity affect the deposition and uptake of Hg by plants from the atmosphere [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Biomonitoring of Mercury Contamination in Poland Based on Its Concentration in Scots Pine (Pinus sylvestris L.) Foliage

Woś

Gruba

Socha

et al. 2021

IJERPH

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This work evaluates current mercury (Hg) contamination in Poland, represented by the Hg concentrations in Scots pine foliage. Samples were collected over 295 investigation plots in monitoring grids throughout Poland, from pines aged between 12 and 147 years. Analyses were conducted with consideration of bioclimatic factors and soil properties. Concentrations in the pine foliage did not exceed the values characteristic of an ecosystem unaffected by industrial pollution, ranging from 0.0032 to 0.0252 mg kg−1 dry mass. However, pine stands located in western and central Poland, and in the northwest near the Baltic Sea, exhibited higher Hg concentrations in foliage than in eastern regions. Hg content in foliage depends on the mean temperature of the driest quarter, as well as on Hg content in soils. This indicates that the periods of drought observed in recent years in Poland may affect Hg concentrations in pine foliage.

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Mercury distribution in the foliage and soil profiles of a subtropical forest: Process for mercury retention in soils

Cited by 23 publications

References 59 publications

Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

Soil–atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments

Biomonitoring of Mercury Contamination in Poland Based on Its Concentration in Scots Pine (Pinus sylvestris L.) Foliage

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