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Tree-ring stable isotopes and historical perspectives on pollution--an overview
1Natural Resources Canada, Geological Survey of Canada, Delta-Lab, 490 de la Couronne, Québec G1K 9A9, Canada. msavard@nrcan.gc.ca
Environmental Pollution (Barking, Essex : 1987)
|December 22, 2009
Summary
Tree ring isotopes (delta13C, delta18O, delta2H, delta15N) reveal past pollution impacts. Physiological responses to pollution stress cause varied isotopic trends, offering insights into environmental changes.
Area of Science:
- Environmental Science
- Biogeochemistry
- Dendrochronology
Background:
- Tree ring stable isotopes (hydrogen, carbon, oxygen, nitrogen) serve as valuable proxies for reconstructing past environmental conditions.
- Pollution can significantly alter tree physiology, impacting isotopic signatures within tree rings.
Purpose of the Study:
- To investigate how pollution affects stable isotope ratios (delta13C, delta18O, delta2H, delta15N) in tree rings.
- To explore the physiological mechanisms underlying observed isotopic shifts in response to pollution stress.
Main Methods:
- Analysis of stable isotopes (delta13C, delta18O, delta2H, delta15N) in tree ring samples.
- Comparison of isotopic data from trees under field and experimental pollution exposure.
Main Results:
- Elevated delta13C values are often observed, linked to stomatal closure or increased carboxylation rates.
- delta18O and delta2H values commonly decrease with pollution, though variable responses exist.
- delta15N variations in tree rings can indicate soil acidification and anthropogenic nitrogen deposition.
Conclusions:
- Tree ring isotope analysis provides a robust method for detecting and understanding past pollution effects.
- The diverse isotopic responses highlight the complex interplay between pollution, tree physiology, and environmental factors.
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