Organic Matter Dynamics in Reclaimed Mine Soils A. F. Wick, P.D. Stahl, W.L. Daniels.

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Presentation transcript:

Organic Matter Dynamics in Reclaimed Mine Soils A. F. Wick, P.D. Stahl, W.L. Daniels

Mining Disturbances Appalachian: –390,217,000 short tons coal produced (33% of total production in US for 2008) Western: –633,597,000 short tons coal produced (54% of total production in US for 2008)

Southwest Virginia Mine, view from 30,000’ -post mining: forest

Northeast Wyoming Mine, view from 30,000’ -post mining: wildlife areas, grazing

Differences in Reclamation East –Amendments/handling crushed rock –High precipitation (~120 cm) –Tree establishment desirable –5 yr bond release West –Topsoil salvaged (stockpile or direct haul) –Low precipitation (<55 cm) –Shrub and grass establishment –10 yr bond release

Though mining and reclamation practices are very different in each region, there is still the potential to accumulate and store C in reclaimed soils What are the accumulation rates?

Carbon Accumulation Rates Shrestha and Lal, 2006 –0.31 – 3.1 Mg ha -1 yr -1 (0-30 cm) in grasslands (OH) –0.58 – 4.0 Mg ha -1 yr -1 (0-30 cm) in forest Benfeldt et al., 2001 –0.43 Mg ha -1 yr -1 (0-10 cm) in grasslands (VA) Schafer et al., 1980 –1.33 Mg ha -1 yr -1 (0-200 cm) in soils <10 yr old (MT) –0.45 Mg ha -1 yr -1 (0-200 cm) in soils >10 yr old Anderson et al., 2008 –1.17 Mg ha -1 yr -1 (0-30 cm) in grass/shrub mix (WY)

Pre-mining Land Use 1 Land Use 2 Land Use 3 Time Since Disturbance Soil Carbon Climate Soil Structure Soil Function Plant Community Relative Amount of C at t0

East: NativeEast: <2 yr

Loss of C with Disturbance-East This loss is for the 0-5 cm depth 0.31 Mg ha -1 yr -1 : 170 yrs 3.1 Mg ha -1 yr -1 : 17 yrs (Wick and Daniels, 2009, BLRS proceedings)

West: 1 yrWest: native

Loss of C with Disturbance-West This loss is for the 0-5 cm depth 0.31 Mg ha -1 yr -1 : 147 yrs 3.1 Mg ha -1 yr -1 : 15 yrs 1.17 Mg ha -1 yr -1 : 39 yrs (Wick et al., 2009, Soil Use Mgt 25: )

<1 year reclamation Native Site Physical Separation of Active OM

Location of OM Active –Living or newly added biomass –<10-20% of total OM –10’s of years Slow –Physically protected (aggregates) –Important source for nitrogen –100’s of years Passive –Very stable, chemically altered and bound (humus) –60-90% of total OM –1000’s of years

Eastern Soil Carbon Accumulation Rates Whole soil: 0.30 Mg ha -1 yr -1 –Active: 0.11 –Slow: 0.10 –Passive: yrs to reach “native” in 0-5 cm Coarse Textured, 27 yr reclaimed site Active 3.16 Mg ha -1 Slow 2.99 Mg ha -1 Passive 2.82 Mg ha -1 Plant Inputs

Eastern Carbon Concentrations Bars represent one standard error from the mean Asterisks indicate significantly higher values among soil ages (P<0.05)

Western Soil Carbon Accumulation Rates Whole soil: 0.17 Mg ha -1 yr -1 –Active: 0.03 –Protected: yrs to reach “native” in 0-5 cm Coarse Textured Soil, 16 yr reclaimed site Active 3.58 Mg ha -1 Protected (slow+passive) 2.23 Mg ha -1 Plant Inputs

Western C Concentrations-Coarse

Western Soil Carbon Accumulation Rates Whole soil: 0.71 Mg ha -1 yr -1 –Active: 0.55 –Protected: yrs to reach “native” in 0-5 cm Fine Textured Soil, 26 yr reclaimed site Active Mg ha -1 Protected (slow+passive) 6.84 Mg ha -1 Plant Inputs

Western C Concentrations-Fine

Conclusions EAST: active pool contained 35% total C WEST: active pool contained 60-70% total C

Conclusions EAST: Physical protection by aggregates and chemical binding of C to soil particles WEST: Climatic conditions and soil texture

Questions Abbey Wick Acknowledgements: Powell River Project WY AML Program Whitney Nash Vicki Regula Lachy Ingram Laurel Vicklund (Belle Ayr Mine) Chet Skilbred (Dave Johnston Mine) Danny Early (Red River Coal) Julie Burger Susanna Gomez Amy Baker