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BZ Core Data 1. Scope Soil Carbon Data Soil Moisture Data Brought to you by Jen and Jamie

BZ Core Data 1. Scope Soil Carbon Data Soil Moisture Data Brought to you by Jen and Jamie. Bonanza Creek LTER 2008. Why Soil ?. Monthly Average Surface Temperature. Organic Soil Thickness, cm. Delta Junction. Burned Ceratadon. Intermediate Aulocomnium.

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BZ Core Data 1. Scope Soil Carbon Data Soil Moisture Data Brought to you by Jen and Jamie

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  1. BZ Core Data 1. Scope Soil Carbon Data Soil Moisture Data Brought to you by Jen and Jamie Bonanza Creek LTER 2008

  2. Why Soil ? Monthly Average Surface Temperature Organic Soil Thickness, cm

  3. Delta Junction Burned Ceratadon Intermediate Aulocomnium Monthly Average Surface Temperature Mature Feathermoss Organic Soil Thickness, cm

  4. Threshold Effect Monthly Average Surface Temperature Thickness

  5. Data Contributorsmany thanks! • Lola Oliver • Roger Ruess • Evan Kane • Jason Vogel • Isla Meyers-Smith • Teresa Hollingsworth • Jennifer Harden, Kristen Manies • Ted Schuur • Merritt Turetsky • Chien-Lu Ping • Kathy O’Neill

  6. 2a. Design and Status of Soil Carbon Data

  7. 2a. Design and Status of Soil Carbon Data Stand Age Veg Class when Sampled Landscape class LTER Clusters Upland CPCRW Floodplain 131 sites, most with replicate profiles

  8. Change Detectionreplicate profiles

  9. 2b. Design and Status of Soil Moisture No Organic Horizons 5 probe types: comparable?

  10. 3a. Readiness of Data Soil C Stocks and Quality (C/N ) Floodplain Upland

  11. 3a and b. Relevance Climate, successional dynamics, threshold behavior • Potential attributes for change detection: • SOIL CARBONSOIL MOISTURE • LITTER QUALITY • DECOMPOSABILITY • CHANGES IN STOCK MOISTURE RETENTION • Threshold behavior • AEROBICITY MOISTURE RETENTION IMPORTANCE OF O HORIZONS INCLUDING LITTER LAYERS

  12. 3b. Readiness of Soil Moisture Data:Calibration of probes Every probe, every installation We are unclear about a relationship between site physical characteristics and ECH2O output. The difference in calibration curve for each site is given below: DFCB: volumetric water content = -0.116 + 0.0007 x DFTB: volumetric water content = -0.4612 + 0.0014 x DFTC: volumetric water content = -0.5256 + 0.0023 x DFCC: volumetric water content = -0.2076 + 0.0008 x

  13. Predicted vs. measured volumetric water content VMC Predicted (Calibration) VMC Observed (cored)

  14. What are your plans for further analysis over the next two years (specifically, what do you think you might be able to contribute to a special issue in which paper submission might be scheduled for June 2009)?

  15. 7. What recommendations do you have at this time for how we might alter our collection of core data variables ? Carbon: • SIMPLE, RELEVANT, SYSTEMATIC • 1. Re-sample FP and UP and Wetlands for soil carbon • 2. Increase sample n for O horizons • Bulk density, C, N • 3. Initiate bioavailability measures: • soil incubations,fractionation,litterbags • include archive samples • 4. Repeat every 5 or 10 yrs …….NEEDED !!!..............SOIL PREP LAB ………………

  16. 7. What recommendations do you have at this time for how we might alter our collection of core data variables ? Soil Moisture: • Recover %vol moisture data from all projects • 2. Back- calibrate %VMC in database • 3. New probes to include measurement of O horizons • TDR and temperature • 4. Calibrate all probes with 1-2 core-samplings of VMC when wet, moist • 5. Repeat calibrations every 5-10 yrs; rotate sites through sampling program

  17. 8. Do you perceive other opportunities for the collection and analysis of core data beyond our current foci? Opportunities for Sample Re-analysis Date Sampled # with soil archives 36 15 ? 4 13 2 3

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