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  Seasonal changes of leaf nitrogen content in trees of Amazonian floodplains

Parolin, P., Armbrüster, N., & Junk, W. J. (2002). Seasonal changes of leaf nitrogen content in trees of Amazonian floodplains. Acta Amazonica, 32(2), 231-240.

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 Creators:
Parolin, Pia1, Author           
Armbrüster, Nicole1, Author           
Junk, Wolfgang J.1, Author           
Affiliations:
1Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976549              

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Free keywords: leaf nitrogen; growth strategy; waterlogging; várzea; floodplain; Amazonia
 Abstract: In Amazonian floodplains the trees are exposed to extreme flooding of up to 230 days a year. Waterlogging of the roots and stems affects growth and metabolic activity of the trees. An increased leaf fall in the aquatic period and annual increment rings in the wood indicate periodical growth reductions. The present study aims at documenting seasonal changes of metabolism and vitality of adult trees in the annual cycle as expressed by changes of leaf nitrogen content. Leaves of six tree species common in floodplains in Central Amazonia and typical representants of different growth strategies were collected every month between May 1994 and June 1995 in the vicinity of Manaus, Brazil. Mean leaf nitrogen content varied between 1.3% and 3.2% in the non-flooded trees. Three species showed significantly lower N content in the flooded period (p=0.05, 0.001, 0.001), the difference ranging 20-25% lower than in the non-flooded period. Two species showed no significant difference while Nectandra amazonum showed 32% more N in the flooded season (p=0.001). Leaf nitrogen content was generally high when new leaves were flushed (in the flooded period) and decreased continuously thereafter in all species. Three species showed an additional peak of nitrogen during the first month of the terrestrial phase, in leaves which had flushed earlier, indicating that flooding may disturb nitrogen uptake

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Language(s): eng - English
 Dates: 2002-06
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 8015
Other: 2078/ S 37780
 Degree: -

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Title: Acta Amazonica
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 32 (2) Sequence Number: - Start / End Page: 231 - 240 Identifier: ISSN: 0044-5967