HB 2018-Filling the gaps in our soils data
Aug. 2, 2018•0 likes•116 views
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Alexandrea Rice
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HB 2018-Filling the gaps in our soils data
- 1. Filling the Gaps in Our Soils Data: It’s the Pits Alexandrea Rice Committee: Ruth Yanai, Russell Briggs, and Matt Vadeboncoeur
- 2. Why Pits? •Disadvantages: •Labor intensive •Destructive •Fewer observations •Unbiased estimate nutrient stocks •Direct measurements of: •Bulk density •Rock volume •Elemental concentrations
- 3. Field Methods •Pit location • Away from trees • Few surface rocks • No recent disturbance • Frame sits securely to soil surface •Dig pits • Secure frames • Quantitative sampling: Oie, Oa, 0-10 cm, 10-30 cm, 30-50 cm, 50+ cm, C horizon
- 4. Sequential Extraction Method Volume Solution Temperature (˚C) Time Other 1. Exchangeable 5 mL 1 M NH4Cl at pH 7 20 20 hr Shaker table 2. Cold Nitric 5 mL 1 M HNO3 at pH 0 20 20 hr Shaker table 3. Hot Nitric 15 mL 1 M HNO3 at pH 0 200 20 min Microwave 20 MPa 4. HF Digest 8 mL 1 mL 1 mL HNO3 HCl HF 210 15 min Microwave 20 MPa Elements analyzed: Al, Ba, Ca, Fe, K, Mg, Mn, N, Na, P, Rb, Si, Sr, Ti, and Zn Slide adapted from Nezat 2005
- 5. Completing the Dataset (Summer 2018) Sites Stand Elevation (m) Bedrock Years Excavated (# plots sampled) Bartlett Experimental Forest C1 570 Mt. Osceola Granite 2004 (3), 2010 (1) C2 340 Conway Granite 2004 (3), 2010 (1) C6 460 Conway Granite 2004 (3), 2010 (1) C8 330 Mt. Osceola Granite 2004 (3), 2010 (1) C9 440 Conway Granite 2004 (3), 2010 (1) Jeffers Brook Experimental Forest JBM 730 Amphibolite 2010 (4) JBO 730 Amphibolite 2010 (4) Hubbard Brook Experimental Forest HBM 500 Rangeley Schist 2018 (4) HBO 500 Rangeley Schist 2018 (4) Data used in: Blum et al. 2007 Nazet et al. 2007; Nazet et al. 2008; Schaller et al. 2008; Schaller et al. 2010; Lucash et al. 2012; Vadeboncoeur et al. 2012; Vadeboncoeur et al. 2014;
- 6. Tree inventory, diameter growth, productivity Litter production and species composition Nutrient resorption from senescing leaves Root biomass and production Root proliferation in nutrient-amended cores Soil respiration and belowground C allocation Carbon and nutrient storage in soils Enzyme activity, soil nutrient availability Mycorrhizal infection and species composition Soil fungi in nutrient-amended cores Mineral weathering and rare earth elements Seedlings, regeneration, herbs Sap flow (transpiration) Ideas for Field Measurements? Join MELNHE: http://www.esf.edu/melnhe/
Editor's Notes
- we sequentially digested Two types of soil samples: The samples were leached w/ 1M NH4Cl to remove the exchangeable fraction, then w/ 1M HNO3 to remove the easily dissolved minerals. The easily-weathered silicates were dissolved with 1M HNO3 at 200 C. The remaining silicates were dissolved with a combination of conc HNO3, HF, HCl which I’ll refer to as the HF digest.
- Use to explain variations Soil Respiration Litter production and chemistry Decomposition rate N mineralization Bedrock type Growth responses
- Need to update this list