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Type: Artigo de periódico
Title: Impact of point source pollution on nitrogen isotope signatures (delta N-15) of vegetation in SE Brazil
Author: Stewart, GR
Aidar, MPM
Joly, CA
Schmidt, S
Abstract: This study presents novel evidence that N-15 natural abundance can be used as a robust indicator to detect pollutant nitrogen in natural plant communities. Vegetation from the heavily polluted industrial area of Cubatao in Sao Paulo State, SE Brazil, was strongly N-15 depleted compared to plants at remote sites. Historic herbarium samples from Cubatao were significantly less N-15 depleted than extant plants, indicating that N-15 depletion of vegetation is associated with present-day nitrogen pollution in Cubatao. The heavy load of nitrogenous atmospheric pollutants in Cubatao provides a nitrogen source for plants, and strongly N-15 depleted air NH3 is likely to contribute to plant and soil N-15 depletion. Epiphytic plants from Cubatao were extremely N-15 depleted (average -10.9parts per thousand) contrasting with epiphytes at remote sites (averages -1.0parts per thousand and -3.0parts per thousand). Nitrogen isotope composition of vegetation provides a tool to determine input of pollutant nitrogen into plant communities. The strong isotopic change of epiphytes suggests that epiphytes are particularly sensitive biomonitors for atmospheric pollutant nitrogen.
Subject: nitrogen pollution
N-15 natural abundance
historic samples
Atlantic rain forest
Country: EUA
Editor: Springer-verlag
Citation: Oecologia. Springer-verlag, v. 131, n. 3, n. 468, n. 472, 2002.
Rights: fechado
Identifier DOI: 10.1007/s00442-002-0906-8
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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