Publication Date:
2011-11-05
Description:
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(15)N) increased substantially in a moist forest in Panama between ~1968 and 2007, as did tree-ring delta(15)N 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(15)N. 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hietz, Peter -- Turner, Benjamin L -- Wanek, Wolfgang -- Richter, Andreas -- Nock, Charles A -- Wright, S Joseph -- New York, N.Y. -- Science. 2011 Nov 4;334(6056):664-6. doi: 10.1126/science.1211979.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Botany, University of Natural Resources and Life Sciences, Gregor Mendel-Strasse 33, 1180 Vienna, Austria. peter.hietz@boku.ac.at〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22053047" target="_blank"〉PubMed〈/a〉
Keywords:
*Nitrogen Cycle
;
Panama
;
Plant Leaves
;
Thailand
;
*Trees
;
*Tropical Climate
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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