of organic pollutants and mercury in a Chinese subtropical forest L. Nizzetto, K. Borgå, T. Larssen, G. Zhang, X. Feng, K.C. Jones

Transcription

1 Mechanisms s of the air-surface ace exchange of organic pollutants and mercury in a Chinese subtropical forest Research Council of Norway L. Nizzetto, K. Borgå, T. Larssen, G. Zhang, X. Feng, K.C. Jones 1

2 Research Council of Norway The players: NIVA Oslo State Key Lab. for Organic Geochemistry (CAS) Guanzhou State Key Lab. for Environmental Geochemistry (CAS) - Guiyang Lancaster Environment Centre, Lancaster, United Kingdom 2

3 The numbers: Research Council of Norway - 3 countries envolved - 6 senior researchers, 2 PhD students. - 3 million Norwegian Krowns (3,6 million RMB) from Norwegian Research Council - About 1,5 million (1,8 million RMB) as counter part from the involved institutes 3

4 Scientific goal: Research Council of Norway To investigate the mechanisms linking the environmental cycling of persistent pollutants and Biogeochemical cycles, in a subtropical Chinese forest. 4

5 Long range transport and fate of semivolatile persistent pollutants (SVPPs) Long/indefinite residence time in the environment Bioaccumulation Toxic effects in target organisms Examples: Hg, PCBs, DDTs, HCBs, new POPs 5

6 Biogeochemical control on the environmental fate Accumulation on key environmental capacitors (soils, sediments vegetation etc.) Environmental compartment as secondary sources of pollutants. t 6

7 Coupling between C cycle the fate of SVPPs? conc (pg/g dw) log sum tri-pcb log conc (pg/g dw) sum tetra-pcb log conc (pg/g dw) sum penta-pcb % organic matter % organic matter % organic matter 5.0 sum hexa-pcb 4.0 sum hepta-pcb 3.5 sum octa-pcb log conc (pg g/g dw ) log conc (pg g/g dw ) log conc (pg g/g dw ) % organic matter % organic matter % organic matter Meyer et al Relationship between soil concentration and OM content 7

8 Coupling between C cycle the fate of SVPPs? 400 Forest 300 Canopy Biomass 200 (g m -2 ) Deposition of PCBs to canopy (ng m -2 d -1 ) Apr 1 2-May 1-Jun 21-Jun 11-Jul 31-Jul 20-Aug 9-Sep 29-Sep 19-Oct 8-Nov Nizzetto et al

9 oupling between C cycle the fate of SVPPs ir VPPs SVPPs Is the system a net sink for these pollutants? SOM tourn-ove Under which h conditions this system re-emit pollutants? oil 9

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11 Research Project Research Council of Norway 11

12 Research Council of Norway The place: Dinghushan Biosphere Reserve - Subtropical forest Dinghu Mountain 12

13 The methods: Research Council of Norway Top soil layer Organic matter Deposition of: -Organic matter -Rain - Native pollutants + Environmental and climatic conditions PUF Sorbant for pollutants 13

14 The big picture Research Council of Norway Effect of Climate change on the global fate and exposure to persistent pollutants Chinese ecoregions: From tropical to boreal ecosystems 14

15 Thanks no 15