PMID- 17554425
OWN - NLM
STAT- MEDLINE
DCOM- 20070817
LR  - 20131121
IS  - 1464-0325 (Print)
IS  - 1464-0325 (Linking)
VI  - 9
IP  - 6
DP  - 2007 Jun
TI  - Tracing the fate of PCBs in forest ecosystems.
PG  - 542-9
AB  - Forests were shown to play an important role in influencing atmospheric 
      concentrations and transport of persistent organic pollutants (POPs) in the 
      environment. World forests cover more than 4 billion hectares and contain up to 
      80% of the above ground organic carbon. Given the lipophilic nature of POPs, this 
      suggests that forests can influence the environmental fate of POPs at a global 
      scale. POP accumulation in forest canopies still presents points of concern given 
      the complexity of these ecosystems. In particular, the role of ecological 
      parameters such as LAI (leaf area index) and SLA (specific leaf area) and their 
      dynamics during the growing season was not sufficiently investigated yet. This 
      paper reviews, compares and interprets a unique case study in which air and leaf 
      concentrations and deposition fluxes for selected polychlorinated biphenyls 
      (PCBs) were measured in three different forest types exposed to the same air 
      masses. In order to trace the air-leaf-soil path of these compounds, a dynamic 
      model of POP accumulation into forest canopy was applied. The dynamics of the 
      canopy biomass strongly affected the trend of leaf concentration with time. 
      Growth dilution effect can prevent the more chlorinated compounds from reaching 
      the partitioning equilibrium before litter fall, while the more volatile 
      compounds can approach equilibrium in the range of few weeks. An amount of up to 
      60 ng of PCBs per square metre of ground surface was predicted to be stored in 
      each of the selected forests at fully developed canopy. Dry gaseous deposition 
      fluxes to forest canopy were estimated to reach a maximum value of about 0.5-1.5 
      ng m(-2) d(-1) during the spring period.
FAU - Nizzetto, Luca
AU  - Nizzetto L
AD  - Department of Chemical and Environmental Sciences-University of Insubria Via 
      Valleggio, 11 Como CO, Italy.
FAU - Stroppiana, Daniela
AU  - Stroppiana D
FAU - Brivio, Pietro Alessandro
AU  - Brivio PA
FAU - Boschetti, Mirco
AU  - Boschetti M
FAU - Di Guardo, Antonio
AU  - Di Guardo A
LA  - eng
PT  - Journal Article
DEP - 20070522
PL  - England
TA  - J Environ Monit
JT  - Journal of environmental monitoring : JEM
JID - 100968688
RN  - 0 (Environmental Pollutants)
RN  - DFC2HB4I0K (Polychlorinated Biphenyls)
SB  - IM
MH  - *Ecosystem
MH  - Environmental Pollutants/chemistry/*metabolism
MH  - Italy
MH  - Polychlorinated Biphenyls/chemistry/*metabolism
MH  - Time Factors
MH  - Trees/*metabolism
EDAT- 2007/06/08 09:00
MHDA- 2007/08/19 09:00
CRDT- 2007/06/08 09:00
PHST- 2007/06/08 09:00 [pubmed]
PHST- 2007/08/19 09:00 [medline]
PHST- 2007/06/08 09:00 [entrez]
AID - 10.1039/b701351e [doi]
PST - ppublish
SO  - J Environ Monit. 2007 Jun;9(6):542-9. doi: 10.1039/b701351e. Epub 2007 May 22.