ArticleJournal of environmental quality
Soil lead, zinc, and copper in two urban forests as influenced by highway proximity.
Article in Journal of environmental quality. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
2 citing papers in PubMed.
- Review
- Soil lead, zinc, and copper in two urban forests as influenced by highway proximity.Journal of environmental qualityArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
2 authors.
Funding
Abstract
Heavy metals emitted by vehicles have the potential to accumulate in soil near roadways, threatening the health of soil, plants, animals, and humans. This study evaluates Pb, Zn, and Cu levels in forest O-horizons, mineral soil, and earthworms near busy roadways in the metro-Washington, DC area. The study sites comprised road-edge environments within urban parks. Six transects were sampled in each park, collecting mineral soil at 1- to 30-m distances from the road edge and dividing it into eight depth increments (0-30 cm). O-horizon plant litter and earthworm samples were also collected at these locations. All samples underwent total Pb, Zn, and Cu X-ray fluorescence analysis. Generally, Pb concentrations (in upper 0-10 cm) were 1-4.8 times higher at 3 m compared to 30 m from the road, with less consistent gradients for Zn and Cu. Concentrations peaked near the soil surface, with lower levels in the O-horizon above and deeper soil layers. Leaded vehicle fuel was phased out by the early 1980s, but legacy Pb contamination persisted in roadside forests, averaging 365 mg kg
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Registered trials
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