Spatial heterogeneity of Soil CO 2 efflux at ADVEX sites: Norunda - Sweden

1. Spatial heterogeneityof Soil CO2 efflux at ADVEX sites: Norunda - Sweden Institute of Systems Biology and Ecology, AS CR, v.v.i University of Lund, Physical Geography and Ecosystems Analysis

2. Materials and Methods • Soil CO2 efflux • 3 systems Li-6250with • home made chambers • Soil temperature • at top layer of soil • surface (1.5 cm depth) • Total 80 collars • 15 sets of measurements • per collar

14. 0 2 4 6 mmol CO2 m-2 s-1 50 m spatial heterogeneity of soil respirationexpressed by R10

15. Correlation between R10 and depth of soil layer above boulder (determined by penetration of a rod) at Norunda site.

16. Averaged soil respirationexpressed by R10 (calculated as arithmetic mean of all 80 collars) at four sites. Averaged soil respirationexpressed by R10

17. Spatial heterogeneity of R10 expressed by CV

18. WD 30 m [deg] WD 1.5 m [deg] WS 30 m [m s-1] WS 1.5 m [m s-1] CO2 conc. 1.5 m, 30 m [ppm] ! 190/191 201/202 night of DOY

19. 100 m ADVEX 2006 setup NORUNDA Sweden D C M – main tower A, B, C, D - ADVEX towers A1, A2…D2 – 1.5 m CO2 conc. D1 C1 D2 C2 M A2 B2 A1 B1 A B

20. 100 m ADVEX 2006 NORUNDA Sweden D WD 40° C D1 C1 WD 330° D2 C2 M B2 A2 WD 130° B1 A1 WD 210° B A

21. CO2 conc. at 1.5 m height in AD and BC transects WD 130° WD 330° C2 - M = 12 ppm Soil efflux contribution cca 4 ppm WD 40° WD 210°

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