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

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
Research question

Proportion of C sequestered by forest ecosystems lost in water flux?


Study site griffin forest 56 6 o n 3 8 o e
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


Field measurements of hydrological flux april december 2000
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



Co 2 flux eddy covariance
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



Annual evapotranspiration estimates 2000
Annual evapotranspiration estimates 2000

  • Catchment water balance method:

    E = precipitation – streamflow

  • Eddy covariance:



Summary of chemical concentrations

Mean values; bars show max and min values close agreement

Summary of chemical concentrations

236

254

231

212


Doc vs flow relationship
DOC vs flow relationship close agreement

DOC flushed from organic near-surface soil horizons at high flows

P=0.001



Interaction between catchment c and n fluxes
Interaction between catchment C and N fluxes close agreement

  • 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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