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Field effects of LAS enriched sludge on soil fauna

Field effects of LAS enriched sludge on soil fauna. Paul Henning Krogh John Jensen Martin Holmstrup National Environmental Research Institute Kristian K. Brandt Veterinary and Agricultural University Georgio Cassani CONDEA Augusta Italy Kaj Henriksen Aalborg University. Aims.

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Field effects of LAS enriched sludge on soil fauna

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  1. Field effects of LAS enriched sludge on soil fauna Paul Henning Krogh John Jensen Martin Holmstrup National Environmental Research Institute Kristian K. Brandt Veterinary and Agricultural University Georgio Cassani CONDEA Augusta Italy Kaj Henriksen Aalborg University

  2. Aims • Is LAS toxic under field condition? • How does the laboratory results agree with field results? • How can we explain the field results?

  3. Mixing LAS into sludge

  4. Laying down stringof sludge in soil groove

  5. LAS in sludge stimulates plant growth

  6. Blok 1 Blok 2 Blok 3 Blok 4 Blok 5 12 m 19 m Experimental design Aerobic sludge + LAS g kg-1 “0” 10 50 4 cm 2 0 4 cm

  7. Plant roots grow in whole bundles through the sludge

  8. 100 80 60 40 20 0 MAY JUN JUL LAS disappearance from sludge LAS % remaining of initial

  9. Digging up a soil block for determination of earthworm abundance

  10. A. caliginosa

  11. Enchytraeids in sludge

  12. Enchytraeids in soil

  13. F. fimetaria Individuals 103 m-2

  14. Willemia sp. Individuals 103 m-2

  15. M. macrochaeta Individuals 103 m-2

  16. Prostigmatid mites Individuals 103 m-2

  17. Gamasid mites (predators) Individuals 103 m-2

  18. Astigmatid mites Individuals 103 m-2

  19. Summary of results Short term: • Colonisation of all soil invertebratesstudied is inhibited by LAS (except two groups of mites) Long term: • Collembolans and earthworms have recovered from LAS • Enchytraeids did not recover from LASafter 5 months • Mites and M. macrochaeta are stimulated by LAS

  20. Lab toxicity of LAS in soil H. assimilis 500 F. fimetaria , mg kg-1 H. aculeifer 400 300 EC50 reproduction 200 A. caliginosa A. longa E. albidus 100 0

  21. How does laboratory results agree with field results? • Inhibitory effects both in lab and field to all soil invertebrates except gamasid mites • Enchytraeids were the most sensitive species in both lab and field • Earthworm and enchytraeid populations were not more sensitive to LAS compared with microarthropods • Recovery of earthworms and collembolans

  22. Conclusion LAS in sludge has a short term toxic effect to soil invertebrates in sludge, but recovery has been attained for allmost all soil invertebrates, except enchytraeids that had just started to recover

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