Wei Yuan

Wei Yuan
Institute of geochemistry Chinese academy of science · environment department

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32
Publications
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Introduction
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Publications

Publications (32)
Article
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 i...
Article
Full-text available
Significant knowledge gaps in mercury (Hg) cycling challenge our ability to assess the effectiveness of the Minamata Convention on Mercury in reducing human and wildlife Hg exposure due to the complicated impacts of climate change. In this study, we comprehensively quantified the Hg spatial distribution and determined the Hg stable isotopes to unde...
Article
Understanding atmospheric mercury (Hg) accumulation in remote montane forests is critical to assess the Hg ecological risk to wildlife and human health. To quantify impacts of vegetation, climatic and topographic factors on Hg accumulation in montane forests, we assessed the Hg distribution and stoichiometric relations among Hg, carbon (C), and nit...
Article
Tropical forest contributes to >50% of global litterfall mercury (Hg) inputs and surface soil Hg storage, while with limited understanding of Hg biogeochemical processes. In this study, we displayed the 5−m resolution of Hg spatial distribution in three 1-ha tropical forest plots across the latitudinal gradient in Southwest China, and determined Hg...
Article
Full-text available
As climate change accelerates, extreme weather events become more severe and frequent. We analyzed the datasets of decade-long observation (2005-2020) of mercury (Hg) stored in two subtropical evergreen forests to understand the impacts of extreme weather on the sequestration of atmospheric Hg in forest ecosystems. Results show a weak correlation b...
Article
Litterfall mercury (Hg) input has been regarded as the dominant Hg source in montane forest floor. To depict combining effects of vegetation, climate and topography on accumulation of Hg in montane forests, we comprehensively quantified litterfall Hg deposition and decomposition in a serial of subtropical forests along an elevation gradient on both...
Article
Forest ecosystem accounts for 31% of global land areas and plays a key role in the global biogeochemical cycling of mercury (Hg). In this critical review, datasets of Hg flux measurements and Hg isotopic compositions in the environmental compartments of forests in the last three decades are synthesized to examine the budgets of Hg mass balance and...
Article
High geological background levels of trace elements (TEs) and high population density in the karst areas of southwest China have imposed environmental pressure on the fragile ecosystems in this region. Understanding the mass budget of TEs, especially the toxic ones, is of great importance to sustain future developments. This study investigates the...
Article
The accuracy of mercury (Hg) dendrochemistry has been questioned because significant knowledge gaps exist in understanding the Hg translocation and mobility in tree-ring. In this study, we evaluated Hg concentrations and isotopic profiles in the tree-ring at a Hg artisanal mining site and a control site with the documented local Hg production inven...
Article
Karst regions have long been recognised as landscapes of ecological vulnerability, however the mass balance and fate of mercury (Hg) in karst regions have not been well documented. This study focused on the largest contiguous karst area in China and investigated Hg mass balance in two catchments, one with high geological Hg (Huilong) and the other...
Article
Litterfall mercury (Hg) deposition is the dominant source of soil Hg in forests. Identifying reduction processes and tracking the fate of legacy Hg on forest floor are challenging tasks. Interplays between isotopes of carbon (C) and nitrogen (N) may shed some lights on Hg biogeochemical processes because their biogeochemical cycling closely links w...
Article
To understand its source, distribution, storage, and translocation in the subtropical forest ecosystems, mercury (Hg) concentrations and stable isotopes in forest biomass tissues (foliage, branch, bark, and trunk) were investigated at Ailao Mountain National Nature Reserve, Southwest China. The total Hg (THg) concentrations in the samples show the...
Article
Organic soil is an important transient reservoir of mercury (Hg) in terrestrial ecosystems, but the fate of deposited Hg in organic forest soil is poorly understood. To understand the dynamic changes of deposited Hg on forest floor, the composition of stable Hg and carbon (C) isotopes in decomposing litters and organic soil layer was measured to co...
Article
Mercury (Hg) deposition through litterfall has been regarded as the main input of gaseous elemental mercury (Hg0) into forest ecosystems. We hypothesize that earlier studies largely underestimated this sink because the contribution of Hg0 uptake by moss and the downward transport to wood and throughfall is overlooked. To test the hypothesis, we inv...
Article
As global climate continues to warm, melting of glaciers releases a large quantity of mercury (Hg) originally locked in ice into the atmosphere and downstream ecosystems. Here, we show an opposite process that captures atmospheric Hg through glacier-to-vegetation succession. Our study using stable isotope techniques at 3 succession sites on the Tib...
Article
A data gap in the evergreen broadleaf (EB) forest ecosystems has resulted in large uncertainties in estimating the quantity of global air–soil exchange of elemental mercury vapor (Hg0). In this study, we systematically measured the soil pore gas Hg0 concentration, air–soil Hg0 exchange flux and associated environmental parameters to elucidate the p...
Article
Composition of stable mercury (Hg) isotopes provides important chemical signatures for tracing the source and transformation pathway of Hg in the environment. However, such measurements are challenging for natural water samples due to the ultratrace levels of Hg and therefore a preconcentration of Hg in water is needed prior to isotope measurements...
Article
Soil is the largest Hg reservoir globally. Data of Hg concentration in surface soil are fundamental to understanding environmental Hg cycling. However, present knowledge on the quantity and global distribution of Hg in soil remains deficient. Using stable Hg isotopic analyses and geospatial data, the concentration and global spatial distribution of...
Article
Full-text available
Processes facilitated by precipitation play an important role on mercury (Hg) accumulation on forest floor and therefore key to Hg cycling in forest ecosystems. Sites along the windward slope of 1,250 to 2,400 m at Mt. Ailao, Southwestern China, have higher precipitation than the leeward slope sites. In this study, measurements of Hg concentration...
Article
The Middle-Late Ordovician transition (Darriwilian to Sandbian Age) witnessed a major pulse of the Great Ordovician Biodiversification Event (GOBE) and distinctive oceanic geochemical fluctuations, such as coeval negative C and Sr isotope excursions. In this study, investigations into geochemical variations, notably the Hg abundance (or Hg/TOC), ha...
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Full-text available
Mainland China is the largest emission region of anthropogenic mercury (Hg) in the world. There have been concerns regarding the emission outflow and chemical transport budget of Hg in the region. Earlier assessments of Hg chemical transport are based on relatively outdated emission data. Recent estimates for anthropogenic (Wu et al., 2016, doi: 10...
Article
Mercury (Hg) accumulation in montane forested areas plays an important role in global Hg cycling. In this study, we used the Hg isotope tracer to understand sources and accumulation processes of Hg in 23 forest sites at the eastern fringe of the Tibetan Plateau (TP). Litter in the TP has a mean total Hg concentration of 32±12 ng g-1, and the 0-60 c...
Article
Full-text available
Mercury (Hg) emission from natural surfaces plays an important role in global Hg cycling. The present estimate of global natural emission has large uncertainty and remains unverified against field data, particularly for terrestrial surfaces. In this study, a mechanistic model is developed for estimating the emission of elemental mercury vapor (Hg-0...
Article
There is a large uncertainty in the estimate of global dry deposition of atmospheric mercury (Hg). Hg deposition through litterfall represents an important input to terrestrial forest ecosystems via cumulative uptake of atmospheric Hg (most Hg0)to foliage. In this study, we estimate the quantity of global Hg deposition through litterfall using stat...
Article
Full-text available
Mercury (Hg) emission from natural surfaces plays an important role in global Hg cycling. The present estimate of global natural emission has large uncertainty and remains unverified against field data, particularly for terrestrial surfaces. In this study, a mechanistic model is developed for estimating the emission of elemental mercury vapor (Hg0)...

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Projects

Projects (2)
Project
We project to reveal the air-plant-soil biogeochemical processes underlying the Hg accumulation in organic soils, and to develop a Hg cycling model in vegetation succession ecosystems.
Project
The processes controlling the mercury re-emission from soil, a fundamental geochemical process in forest ecosystems, are poorly understood. This proposed research aims to quantify the contribution to mercury re-emission from soil mercury pool, and fractions changes of atmospherically deposited mercury of during various time period, and develop a conceptual model for mercury re-emission from soil and the associated isotope fractionation through characterizing the soil re-emission processes using stale mercury isotope techniques in the forests of different ages in the glacier retreated area of Hailuogou, China. Results from the proposed study will provide new insights to global mercury cycling, advance the understanding in mercury geochemical processes in glacier and frozen ground under the changing climate, and assess the environmental effects caused by mercury inputs from the historic emissions since the onset of industrialization of the western world as well as the effectiveness of emission reduction measures required by the legally binding Minamata Convention