Journal
SCIENCE
Volume 334, Issue 6056, Pages 664-666Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1211979
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Funding
- F. H. Levinson Fund
- Austrian Science Fund [P19507-B17]
- Austrian Science Fund (FWF) [P19507] Funding Source: Austrian Science Fund (FWF)
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Deposition of reactive nitrogen (N) from human activities has large effects on temperate forests where low natural N availability limits productivity but is not known to affect tropical forests where natural N availability is often much greater. Leaf N and the ratio of N isotopes (delta N-15) increased substantially in a moist forest in Panama between similar to 1968 and 2007, as did tree-ring delta N-15 in a dry forest in Thailand over the past century. A decade of fertilization of a nearby Panamanian forest with N caused similar increases in leaf N and delta N-15. Therefore, our results indicate regional increases in N availability due to anthropogenic N deposition. Atmospheric nitrogen dioxide measurements and increased emissions of anthropogenic reactive N over tropical land areas suggest that these changes are widespread in tropical forests.
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