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The contribution of hydrological fluxes to carbon sequestration in a temperate forest plantation

Kate Heal , Nick Forrest, Paul Jarvis School of GeoSciences The University of Edinburgh Xiangqing Ma Fujian Agriculture and Forestry University, China. The contribution of hydrological fluxes to carbon sequestration in a temperate forest plantation. Research question.

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The contribution of hydrological fluxes to carbon sequestration in a temperate forest plantation

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  1. Kate Heal, Nick Forrest, Paul Jarvis School of GeoSciences The University of Edinburgh Xiangqing Ma Fujian Agriculture and Forestry University, China The contribution of hydrological fluxes to carbon sequestration in a temperate forest plantation

  2. Research question Proportion of C sequestered by forest ecosystems lost in water flux?

  3. Study site: Griffin Forest (56.6oN, 3.8oE) • Catchment area 4.5 km2 • Dalradian schist overlain by humic gley/ stagnohumic gley soils • Sitka spruce forest planted 1980-1981 Edinburgh

  4. Field measurements of hydrological flux April-December 2000 Storage raingauges x 5 Logging raingauges x 2 Throughfall & stemflow samplers x 24 trees Cloudwater gauges x 2 www.met-office.gov.uk

  5. P<0.001

  6. CO2 flux (eddy covariance) • Movement of air parcels measured in 3 dimensions using a sonic anemometer • Air analysis with IRGA => flux of CO2 calculated • Other micrometeorological measurements to check energy balance and calculate evapotranspiration www.eastmain1.org/en/measuring-CO2-emissions.html

  7. in 2000

  8. Annual evapotranspiration estimates 2000 • Catchment water balance method: E = precipitation – streamflow • Eddy covariance:

  9. Estimates of evapotranspiration by different methods show close agreement • Catchment water balance closure within uncertainties => Confidence in measurements of hydrological fluxes

  10. Mean values; bars show max and min values Summary of chemical concentrations 236 254 231 212

  11. DOC vs flow relationship DOC flushed from organic near-surface soil horizons at high flows P=0.001

  12. Impact of C loss in river on net C sequestration

  13. Interaction between catchment C and N fluxes • 73% of atmospheric N input removed by canopy • C sequestration per unit added N (ΔC:ΔN) • c.170 in 2000 at Griffin • 210 (Magnani et al., 2007) • 25 (De Vries et al., 2006) www.whrc.org • New NERC-funded project • BACIP design with 2 adjacent sub-catchments • 1 year before • 4 years after: treatment with 40 kg N ha-1 yr-1 • (NH4NO3 4 x year, minimise water volume) • Calculate ecosystem and catchment ΔC:ΔN

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