2022
DOI: 10.1021/acs.est.2c04217
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Mercury Uptake, Accumulation, and Translocation in Roots of Subtropical Forest: Implications of Global Mercury Budget

Abstract: Plant roots are responsible for transporting large quantities of nutrients in forest ecosystems and yet are frequently overlooked in global assessments of Hg cycling budgets. In this study, we systematically determined the distribution of total Hg mass and its stable isotopic signatures in a subtropical evergreen forest to elucidate sources of Hg in plant root tissues and the associated translocation mechanisms. Hg stored in roots and its isotopic signatures show significant correlations to those found in sur… Show more

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Cited by 25 publications
(9 citation statements)
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“…Detailed information on Mt. Ailao has been described in our previous studies. Briefly, Mt. Ailao has a subtropical monsoon climate with an average annual temperature of 11 °C and an average annual rainfall of 1682 mm.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Detailed information on Mt. Ailao has been described in our previous studies. Briefly, Mt. Ailao has a subtropical monsoon climate with an average annual temperature of 11 °C and an average annual rainfall of 1682 mm.…”
Section: Methodsmentioning
confidence: 99%
“…The Hg concentrations of basal resources (excluding the fresh leaves) are more than 1 order of magnitude higher than those of rocks (e.g., 161.2 ± 78.7 versus 4.2 ± 1.4 ng g −1 ). 44 Hence, the contribution of geogenic Hg to forest bird food chains can be neglected. Given the absence of even-MIF (Δ 200 Hg) processes in forests, 69,70 we estimated contributions of atmospheric Hg 2+ and atmospheric Hg 0 to the forest bird food chains using the Hg even-MIF mixing model where f 1 is the atmospheric Hg 2+ input contribution and f 2 is the atmospheric Hg 0 input contribution.…”
Section: Sampling For Nestlingsmentioning
confidence: 99%
“…16 capability of root uptake seems to be limited owing to the hamper of cell wall membranes in root zones. 17 Hg accumulation in surface soils is also influenced by soil properties. 1,18 Many studies highlighted the importance of soil organic carbon (SOC), soil texture, and soil microbes on Hg stability and bioavailability.…”
Section: Introductionmentioning
confidence: 99%
“…Vegetation, the most typical land cover, is known to affect soil Hg cycling through multiple pathways, such as assimilation of elemental Hg 0 from the atmosphere followed by litterfall, formation of organic matter which complicates complexation with soil Hg, formation of canopy shading which constrains soil Hg emissions, and root uptake of dissolved divalent Hg II from the soils . However, the capability of root uptake seems to be limited owing to the hamper of cell wall membranes in root zones …”
Section: Introductionmentioning
confidence: 99%
“…To adequately capture the signal and variability of Hg cycling in this ecosystem, we increased the spatial and temporal resolution of the sampling regimes to measure process heterogeneity and identify areas of Hg hotspots (i.e., areas with elevated Hg concentrations) caused by soil Hg migration. Techniques of stable Hg isotopes were utilized to improve the knowledge of the Hg biogeochemical cycles in karst forests. ,,, There are three unique dimensions of Hg isotopic fractionation, i.e., the mass dependent fractionation (MDF, mainly represented by δ 202 Hg), odd mass independent fractionation (odd-MIF, reported as Δ 199 Hg and Δ 201 Hg), and even mass independent fractionation (even-MIF, reported as Δ 200 Hg and Δ 204 Hg). The isotopic fractionation signals had been successfully applied for distinguishing the Hg sources and transport pathways of Hg biogeochemical processes in forest ecosystems, since Hg source endmembers (e.g., Hg in rainfall, air, geological storages, and etc.)…”
Section: Introductionmentioning
confidence: 99%