Task force on Yasso modelSC 12 Alexandra Freudenschuß Department of Forest Inventory JRC technical workshop on reporting LULUCF Arona 06.05.2014
Specific contract 12 • Framework contract for the provision of forest data and services in support to the European Forest Data Centre • Reference: 2012/ S 78-127532 of 21/04/2012 • within Task 3 of the LULUCF MRV project: • Input to improving the comparability in MRV • across EU MS
General objective • Provide support to a limited number of Member States on modeling carbon stock change of forest mineral soils • The contractors have experience on modeling soil carbon stock changes of forest lands in the context of GHG inventories • → use Yasso07 in their UNFCCC/KP reporting
Specific tasks of SC 12 • Presentations at JRC LULUCF workshop • Set up of a forest soil modeling task force (TF) • State of the art on forest soil modelling • Preliminary model runs in the selected MS
TF on forest soil modeling • Four contractors: • Administration: IGN (FR) • SC Biomass team: Metla (FN), WSL (CH), BFW (AT) • Selected MS: • EE, FR, RO, ES • out of eight interested countries; • criteria of selection: data availability, human and technical resources, geographical representation of EU countries, ecological gradient and actual reporting system
Work progress • Contact established to all four MS • Successful installation of Yasso07 and model runs with sample data • Identification of suitable, country-specific data sets • Data preparation and data enquiry • First, preliminary model runs - Spain and France • Active collaboration between contractors and MS (meetings, email exchange)
YASSO – Input data • Vegetation and Litterfall (time series of litter quantity, natural mortality, harvest) – preferable NFI data of several decades • Litter quality (fractions of acid-, water-, ethanol and insoluble material) • Weather data (mean annual temperature, precipitations and temperature amplitude)
Site selections France Spain Fig. 1: Location of RENECOFOR sites (Level I) Fig. 2: Location of the 3 provinces – Navarra (N), Murcia (SE), Madrid (central).
Preliminary results - Spain [t/ha] C-stocks at the 5 plots in Rascafria (Madrid region) [t/ha] [years] [years] Figures 2-7: SOM trend. Blue line: mean SOM (t/ha). Red Lines: 95% Confidence Intervals of the mean.
Preliminary results - Spain • Lack of information of the turnover of the leaves/needles for some Iberian species. • Lack of knowledge of the turnover of the loss of coarse roots and branches. • Lack of data on chemical quality for some tree species. • NFI do not always registered forest management – identification of harvest and logging is often difficult • Data are available from 2-3 comparable NFI cycles of 10 years. Longest available time period is 30 years. • Data gaps increase uncertainty of model results • Compared to field data Yasso07 results overestimate C-stock but the trend is similar.
Preliminary results - France Mean total C-stocks over 102 sites [t/ha] Current limitations/assumptions: • Spinup to initialise the Yasso runs and averaging inputs for simulation until observed values are available; • No uncertainty analysis to minimize run time; • Climate currently mean 1971-2000; • C stock estimate lower compared to observation (ca. 70 t C/ha) but ok for a first estimate [years] Figure: Mean total (soil and litter) C stock over 102 sites.
Expected challenges • Application of Yasso07 at sites with extended drought conditions • Information on the decomposition of litter and deadwood into four chemical compounds may not be sufficient to apply Yasso at sites with highly mixed tree species.
Next steps • Finalisation of data preparation: biomass and weather time series (esp. EE, RO) • Set up and/or further improve Yasso07 model runs with country-specific data • Exchange experience on Yasso07 application at sites with extended drought conditions (FR, ES) • Draft final report ready in July 2014
YASSO Expert team • Aleksi Lehtonen – Metla (FN) • Markus Didion – WSL (CH) • Robert Jandl – BFW (AT)