Hb2013 biche decomp

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  • Nutrients could be enhancing the microbial communities PLUS low levels of natural N deposition stimulated while adding N at <5X natural dep slowed decomp. (Knorr 2005)
  • Hb2013 biche decomp

    1. 1. Connecting Kids to Local Science LEAF LITTER DECOMPOSITION IN THE MELNHE STANDS Rick Biche RET A. Crosby Kennett Middle School
    2. 2. Teacher  Tangible data (mass loss)  Nutrient limitation age appropriate concept  Species id and litter bag construction Researcher  N -> Higher N increases litter mass loss (Fog 1988) but not always (Knorr et al 2005)  Little information on P  Arthropods -> Varied effects (Schmitz 2010)  Litter from young stand species should decompose faster based individual species rate data from Melillo et al 1982 WHAT CONTROLS LITTER MASS LOSS?
    3. 3. Teacher  Authentic science  Local science  Real Scientists Researcher  Hypotheses  Co-limitation of litter mass loss  Arthropods will increase litter mass loss  Young stand species mix will lose mass faster than mature stand mix WHAT CONTROLS LITTER MASS LOSS?
    4. 4.  4 stands  N, P, N&P, and Control  2 mesh sizes  2 mm  63 µm  2 litter mixes  Young: American Beech, Red Maple, Pin Cherry, White Birch  Mature: American Beech, Sugar Maple, Yellow Birch  Collections  June 12, 2013  Fall 2013  Summer 2014 METHODS
    5. 5. MIX AND MESH
    6. 6. Nutrients p=0.02 Mesh p<0.001 Nutrient X Mesh p=0.05
    7. 7. Nutrients p=0.02 Mesh p<0.001 Nutrient X Mesh p=0.05 Con vs. P p=0.01
    8. 8. Teacher  Middle school students can do science! Researcher  Beginning to see a P effect on litter mass loss  Microarthropods slowing initial litter mass loss  Initial litter mass loss more rapid for young stand litter (Pin Cherry?) CONCLUSIONS
    9. 9.  The 100 students of Team 2 at A. Crosby Kennett Middle School and Sean Littlefield for field help  Ruth Yanai, Craig See, Adam Wild and the many members of the Shoestring crew  NSF Grant Proposal # DEB 0949324  Supplement by RET 2013 (1314909)  Hubbard Brook Research Foundation RET 2012 Photos http://hbr.lternet.edu/events/past_events.htm http://hubbardbrook.blogs.plymouth.edu/2009/07/09/presentation -maggie-zimmer-and-katie- harvey/ ACKNOWLEDGEMENTS

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