Document Detail

Assessing the critical level of SO2 for Scots pine in situ.
MedLine Citation:
PMID:  15091366     Owner:  NLM     Status:  PubMed-not-MEDLINE    
A field survey was performed in eastern Finland, where measured ambient SO2 concentrations were 1.4-3.8 microg m(-3) a(-1) and bulk S deposition 0.17-0.32 g m(-2) a(-1) in 1991-1993. The accumulation of sulphur (S) in needles of Scots pine (Pinus sylvestris L.) was studied with XRF, IC and FESEM analyses and the needle damage examined under a light microscope and by SEM. Foliar N concentrations were also measured. Foliar total S concentrations were observed to be above the normal S level (500-700 microg g(-1)) over almost the whole area. Slight chlorosis and/or necrosis of the needle tips and stomatal areas, changes in the needle surface waxes and localization of S into needle tips and mesophyll cells around the stomata suggested the impact of S deposition, as did the calculations of St/Nt, and 'predicted' and 'excess' S. A concentration of about 900 microg g(-1) may be considered a critical level for foliar St in areas with low N supply.
S Manninen; S Huttunen; P Rautio; P Perämäki
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  93     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  1996  
Date Detail:
Created Date:  2004-04-19     Completed Date:  2005-01-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  27-38     Citation Subset:  -    
Department of Biology, University of Oulu, Linnanmaa, 90570 Oulu, Finland.
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