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

This study investigates the contribution of hydrological fluxes to carbon sequestration in a Sitka spruce forest plantation. The research aims to assess the proportion of carbon sequestered by the forest ecosystem that is lost through water flux. Field measurements of hydrological flux, CO2 flux, and chemical concentrations were collected at the study site. The impact of carbon and nitrogen flux interactions on net carbon sequestration was also examined. The study provides insights into the relationship between hydrological processes and carbon sequestration in forest ecosystems.

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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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