Effect of resolution of input data on modelled N 2 O fluxes at landscape scale Hans Kros, Wim de Vries, Gert Jan Reinds
Outline Introduction Modelling N 2 O at landscape scale Comparing dataset with different resolutions Effect of resolution on N 2 O emissions Conclusions
Landscape interactions NH 3 DON N 2 O N 2 O N 2 O NH 4 + NO 3 - NO 3 - N 2 O DON N 2 O NO 3 - NH 4 + NO 3 -
Effect of object scale Noordelijke Friese Wouden
Noordelijke Friese Wouden C4 Landscapes Landscape characteristics: Area: Approx. 500 km 2 Intensive dairy farming Hedgerows Flat, Pumped drainage
INTEGRATOR Models and data available European scale data: 1 km x 1 km at NCU level (11 plots, 4518 ha) INITIATOR2 - NL National scale data: 250 m x 250m at STONE plot level (354 plots, 143 ha) INITIATOR2 NFW Regional scale (landscape) data: 250 m x 250 m at parcel level (4756 plots, 9.5 ha)
EU soil map CLC2000 Landuse INTEGRATOR Eurostat data: Animal numbers - Croptypes - Yields etc. Model intercomparison - N animal manure - N fertilizer - N deposition - N mineralisation NCU 1 1km 2 11 plots 4518 ha NH 3 emission N 2 O emission NO 3 leaching NL soil map NL Landuse (LGN) NL soil map NL Landuse (LGN) NL data: - Animal numbers - Crop types - Yields etc. Stone plot 250 250m 2 345 plots 143 ha NFW plot 250 250m 2 INITIATOR NL 4756 plots 9.5 ha
Modelling N2O at landscape scale
NL/NFW: INITIATOR2 model
Climate change EU: INTEGRATOR model Land cover change Agricultural change E-D matrix N deposition NH 3, NO x EFISCEN (forests) Empirical+meta models (Nature, Peatlands) MITERRA (agriculture) Organic C Organic C YASSO INTEGRATOR ΔC pool CO 2 N 2 O, CH 4, CO 2 N leaching, N budget
Overview scaling differences Aspect EU: Europe NL: National NFW: Landscape Aim Quantify effects of EU policies on NH 3, N 2 O and CH 4 emissions and N- en P-surpluses. Quantify effects of Dutch policies on NH 3 emissions and deposition, GHG emissions, N, P leaching Monitoring of effects of management changes in a region Scale NCUs STONE plots NFW plots Animal RAINS CBS CBS numbers Soil data Not included National soil database National soil database N manure input N fertilizer input Manure distribution at NUTS2 level Downscaling FAO data to NUTS 2 level N Deposition European scale modeling EMEP Manure distribution at municipality level Based on national management and statistics National scale modeling OPS Manure distribution at farm level Based on national management and statistics Regional scale modeling OPS
Comparing dataset with different resolutions
Land Use: European, National, Regional EU landuse (CLC2000) Map/INTEGRATOR clusters NL landuse (LGN3+) Map/INITIATOR2 clusters NFW Landuse (BRP) Map/INITIATOR2 NFW clusters
Area (ha) Areas according to different data sources 50000 45000 40000 35000 30000 Landscape 25000 National 20000 European 15000 10000 5000 0 Nature Crops Pastures
Soil type: European, National, Regional EU Soil Map/ INTEGRATOR clusters NL Soil Map/ INITIATOR2 clusters NL Soil Map/ INITIATOR2 NFW clusters
Area (ha) Areas according to different data sources 30000 25000 20000 15000 10000 Landscape National European 5000 0 Sand Loam Clay Peat
Wetness class: European, National, Regional EU GT Map/ INTEGRATOR clusters NL GT Map/ INITIATOR2 clusters NL GT Map/INITIATOR2 NFW clusters
Area (ha) Areas according to different data sources 45000 40000 35000 30000 25000 20000 15000 Landscape National European 10000 5000 0 Dry Moist Wet
Effect of resolution on N 2 O emissions
Fertilizer use 2007 (kg N ha -1 ) European National Landscape
Application animal manure 2007 (kg N ha -1 ) European National Landscape
N 2 O emission 2007 (kg N 2 O-N ha -1 ) European National Landscape
Effect on N 2 O fluxes in NFW due to difference in resolution Resolution Area N am N fe N 2 O emh N 2 O denis N 2 O emdi N 2 O emgw N 2 O emt (km 2 ) (kton N) (kton N 2 O-N) EU 499 8.6 9.7 0.02 0.17 0.01 0.02 0.22 NL 367 8.3 7.4 0.02 0.40 0.03 0.02 0.47 NFW 423 8.2 9.7 0.02 0.43 0.04 0.01 0.50 N am = animal manure N fe = fertilizer emh = housing emission denis = soil emission emdi = ditch emission emgw = groundwater emission emt = total emission
Conclusions Large scale data are biased: Grassland areas: NFW~NL<<EU Peaty soils: NFW~NL>>EU Wet soils: NFW>NL>>EU The higher the resolution, the higher the N 2 O emission; mainly due to soil emission Lower N 2 O emission estimates based on coarse European data are due to an underestimation of peat soil and wet areas This may have consequence for the European estimates
Thank you Wageningen UR