Document Detail

Plant senescence: a mechanism for nutrient release in temperate agricultural wetlands.
MedLine Citation:
PMID:  16905226     Owner:  NLM     Status:  MEDLINE    
The beneficial uptake of nutrients by wetland plants is countered to some extent by nutrient release back into the aquatic environment due to vegetative die-back. This current study examined whether Leersia oryzoides, a common wetland plant, exhibits luxury uptake of nutrients from simulated farm runoff. The study also tested whether with subsequent decomposition, these nutrients are released back into the water column. When exposed to elevated (>2mg/L N and P) runoff, L. oryzoides assimilated significantly higher concentrations of nitrogen (p<0.001) and phosphorus (p<0.001) in above-ground biomass as compared to non-enriched treatments (<0.05 mg/L N and P). Subsequently, senescence of enriched above-ground biomass yielded significantly higher concentrations of phosphorus (2.19+/-0.84 mg P/L). Using L. oryzoides as our model, this study demonstrates nitrogen and phosphorus sequestration during the growing season and release of phosphorus in the winter.
R Kröger; M M Holland; M T Moore; C M Cooper
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-08-14
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  146     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-02-02     Completed Date:  2007-04-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  114-9     Citation Subset:  IM    
Department of Biology, University of Mississippi, 220 Shoemaker Hall, University, MS 38677, USA. <>
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MeSH Terms
Biodegradation, Environmental
Humic Substances
Nitrates / metabolism
Phosphorus / metabolism
Plants / growth & development,  metabolism*
Water Pollutants, Chemical / metabolism*
Water Pollution*
Reg. No./Substance:
0/Humic Substances; 0/Nitrates; 0/Water Pollutants, Chemical; 7723-14-0/Phosphorus

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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