The contribution of hydrological fluxes to carbon sequestration in a temperate forest plantation Kate Heal, Nick Forrest, Paul Jarvis School of GeoSciences.

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Presentation transcript:

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

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) Catchment area 4.5 km 2 Dalradian schist overlain by humic gley/ stagnohumic gley soils Sitka spruce forest planted Edinburgh

Field measurements of hydrological flux April-December Storage raingauges x 5 Cloudwater gauges x 2 Logging raingauges x 2 Throughfall & stemflow samplers x 24 trees

P<0.001

CO 2 flux (eddy covariance) Movement of air parcels measured in 3 dimensions using a sonic anemometer Air analysis with IRGA => flux of CO 2 calculated Other micrometeorological measurements to check energy balance and calculate evapotranspiration

in 2000

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

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

Summary of chemical concentrations Mean values; bars show max and min values

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

Impact of C loss in river on net C sequestration ParameterStudy site Griffin Forest (Scotland) Hokkaido (N Japan) Moor House (N England) ReferenceShibata et al. (2005) Worrall et al. (2003) VegetationSitka spruce plantation Temperate deciduous forest Heather (dwarf shrub) C loss in water (t ha -1 a -1 ) (incl. POC) ( without POC) C sequestered (t ha -1 a -1 ) % sequestered C lost in water (27 without POC)

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) 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 –(NH 4 NO 3 4 x year, minimise water volume) –Calculate ecosystem and catchment ΔC:ΔN