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A synthesis of terrestrial mercury in the western United States: Spatial distribution defined by land cover and plant productivity

Overview of attention for article published in Science of the Total Environment, October 2016
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2 tweeters

Citations

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48 Mendeley
Title
A synthesis of terrestrial mercury in the western United States: Spatial distribution defined by land cover and plant productivity
Published in
Science of the Total Environment, October 2016
DOI 10.1016/j.scitotenv.2015.11.104
Pubmed ID
Authors

Daniel Obrist, Christopher Pearson, Jackson Webster, Tyler Kane, Che-Jen Lin, George R. Aiken, Charles N. Alpers

Abstract

A synthesis of published vegetation mercury (Hg) data across 11 contiguous states in the western United States showed that aboveground biomass concentrations followed the order: leaves (26μgkg(-1))~branches (26μgkg(-1))>bark (16μgkg(-1))>bole wood (1μgkg(-1)). No spatial trends of Hg in aboveground biomass distribution were detected, which likely is due to very sparse data coverage and different sampling protocols. Vegetation data are largely lacking for important functional vegetation types such as shrubs, herbaceous species, and grasses. Soil concentrations collected from the published literature were high in the western United States, with 12% of observations exceeding 100μgkg(-1), reflecting a bias toward investigations in Hg-enriched sites. In contrast, soil Hg concentrations from a randomly distributed data set (1911 sampling points; Smith et al., 2013a) averaged 24μgkg(-1) (A-horizon) and 22μgkg(-1) (C-horizon), and only 2.6% of data exceeded 100μgkg(-1). Soil Hg concentrations significantly differed among land covers, following the order: forested upland>planted/cultivated>herbaceous upland/shrubland>barren soils. Concentrations in forests were on average 2.5 times higher than in barren locations. Principal component analyses showed that soil Hg concentrations were not or weakly related to modeled dry and wet Hg deposition and proximity to mining, geothermal areas, and coal-fired power plants. Soil Hg distribution also was not closely related to other trace metals, but strongly associated with organic carbon, precipitation, canopy greenness, and foliar Hg pools of overlying vegetation. These patterns indicate that soil Hg concentrations are related to atmospheric deposition and reflect an overwhelming influence of plant productivity - driven by water availability - with productive landscapes showing high soil Hg accumulation and unproductive barren soils and shrublands showing low soil Hg values. Large expanses of low-productivity, arid ecosystems across the western U.S. result in some of the lowest soil Hg concentrations observed worldwide.

Twitter Demographics

The data shown below were collected from the profiles of 2 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 48 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 1 2%
Unknown 47 98%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 12 25%
Researcher 6 13%
Student > Master 5 10%
Other 5 10%
Student > Bachelor 4 8%
Other 12 25%
Unknown 4 8%
Readers by discipline Count As %
Environmental Science 20 42%
Earth and Planetary Sciences 7 15%
Agricultural and Biological Sciences 7 15%
Computer Science 1 2%
Biochemistry, Genetics and Molecular Biology 1 2%
Other 4 8%
Unknown 8 17%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 14 January 2016.
All research outputs
#8,941,605
of 14,268,610 outputs
Outputs from Science of the Total Environment
#7,637
of 12,175 outputs
Outputs of similar age
#191,048
of 365,822 outputs
Outputs of similar age from Science of the Total Environment
#192
of 375 outputs
Altmetric has tracked 14,268,610 research outputs across all sources so far. This one is in the 24th percentile – i.e., 24% of other outputs scored the same or lower than it.
So far Altmetric has tracked 12,175 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.7. This one is in the 28th percentile – i.e., 28% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 365,822 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 37th percentile – i.e., 37% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 375 others from the same source and published within six weeks on either side of this one. This one is in the 37th percentile – i.e., 37% of its contemporaries scored the same or lower than it.