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 Mature Feathermoss Monthly Average Surface Temperature Organic Soil Thickness, cm

4. Threshold Effect Monthly Average Surface Temperature Thickness

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

8. Change Detection replicate 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 AEROBICITYMOISTURE RETENTION IMPORTANCE OF O HORIZONS INCLUDING LITTER LAYERS

12. We are unclear about a relationship between site physical characteristics and ECH 2 O 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 Every probe, every installation 3b. Readiness of Soil Moisture Data: Calibration of probes

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

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: 1.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. ? 36 4 13 3 15 2 # with soil archives Date Sampled Opportunities for Sample Re- analysis 8. Do you perceive other opportunities for the collection and analysis of core data beyond our current foci?