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

3. Site nameNorunda CountrySweden RegionUppland Latitude60° 05' 11.39'' N Longitude17° 28' 46.21'' E Elevation45 m slope0° exposure- Mean annual temperature5.5 °C Annual precipitation527 mm forest type Evergreen needleleaf forest soil description - FAODystric regosol soil depth2 m Depth of main rooting zone 0.35 m

14. 0 2 4 6  mol CO 2 m -2 s -1 50 m spatial heterogeneity of soil respiration expressed by R 10

15. Correlation between R 10 and depth of soil layer above boulder (determined by penetration of a rod) at Norunda site.

16. Averaged soil respiration expressed by R10 (calculated as arithmetic mean of all 80 collars) at four sites. Averaged soil respiration expressed by R 10

17. Spatial heterogeneity of R 10 expressed by CV

18. 190/191 201/202 night of DOY WD 30 m [deg] WD 1.5 m [deg] WS 1.5 m [m s -1 ] CO 2 conc. 1.5 m, 30 m [ppm] WS 30 m [m s -1 ] !

19. 100 m ADVEX 2006 setup NORUNDA Sweden D M A B C B1 A1 D1 C1 B2 A2 C2 D2 M – main tower A, B, C, D - ADVEX towers A1, A2…D2 – 1.5 m CO 2 conc.

20. 100 m ADVEX 2006 NORUNDA Sweden D M B A C A1A1 B1B1 D1 C1 A2A2 B2B2 C2C2 D2 WD 210° WD 130° WD 330° WD 40°

21. WD 130° WD 330° WD 40° WD 210° CO 2 conc. at 1.5 m height in AD and BC transects C2 - M = 12 ppm Soil efflux contribution cca 4 ppm

22. Thank for your attention