global soil organic carbon map gsoc : develop a global soc by 5th dec 2017
TRANSCRIPT
Global Soil Organic Carbon Map GSOC
Background Guidelines Cookbook Roadmap 2017 Timeline
Develop a global SOC map by 5th Dec 2017
Background Precise and reliable global view on soil organic carbon (SOC) is needed under different UN conventions and related processes (SDG, 4per1000)
Soil carbon is key indicator related to water and nutrient dynamics of soils, its decomposer activity, and the physical soil structure/stability.
A combination of reliable national SOC estimates around the globe can provide a new baseline on the currently existing SOC density.
Task initiated by UNCCD-SPI and GSP-ITPS
Guidelines – overall approach Country-driven approach Generate SOC soil grids (version 0 acc to P4IP): use existing soil
profile data and soil (polygon) maps, combined with digital soil mapping
Build on UNFCCC/IPCC GHG definitions and reporting methods (see GSP-Guideline, 0-30 cm; (if possible subdivide depth classes; GlobalSoilMap Specs: 0-5 cm, 5-15 cm, 15-30 cm, 30-60 cm, 60-100 cm and 100-200 cm)
Build on existing national capacities and extend these Develop first indicator for the Global Soil Information System
(GSIS) - GSP demonstration project
Soil Polygon map
Soil profiles
SoilSTAT
Soil grids
Pillar 4 Indicator: soil C stock 0-30 cm (soil organic carbon, mineral soils, peat, O-layer)
Representative set of samples from soil profiles with soil C analysis, BD and stones
estimated or measured
Soil maps as basic data for upscaling
DSM Class-/Geomatching
Rasterization
+ land cover, climate, etc.
1k version 0 soil grids
National SOC map exists
YesNo
GSP specifications are fulfilled
Yes No
recalculate
Product accomplished: deliver to GSP secretariat
Produce new map with own capacity
Compile national SOC measurements
Yes No
Share national SOC data with GSP secretariat to organise
the uscaling to 1 km grid
Yes
1
2
3
Country-driven approach
Specification 1: Share auxiliary information about the national data sources, e.g. type of sampling, density of sampling points, sampling design, time of sampling, selection criteria.
Metadata
Specification 2: Share metadata about SOC analysis method/s, type of analysis; type of apparatus; temperatures used; in case of wet oxidation: method and variations; sample treatment, sample preparation; for calcareous soils: report whether and how inorganic carbon was analysed.
Specification 3: Share metadata about SOC stocks calculation
SOC = d * BD * (Ctot – Cmin) * CFst)Mineral soils
SOCforest floor = weightOR * (Ctot – Cmin)Forest floor(O-layer)
Peat extent (area) of peat (and peat types), the depth of peat, %C and peat density
Derive data from soil horizons for d = 0-30 cm
Metadata
Specification 4: Share details about the upscaling approach 1. Upscaling method (description, citation)2. Input data/covariates, grid, soil maps, etc.
Specification 5: Temporal dimension: share the sampling date. If the national data situation allows, pre-1990 or post-1990 sub data sets might be defined. Quality/capacity: The more data points are used, the better the reliability and accuracy of the SOC map
Use options of the resultant map
Data sharing procedure
Data shared by countries will be collected by the GSP Secretariat.
The GSP data policy will ensure that the national terms of condition are fully respected.
Data can be shared using common GIS formats and metadata should be compiled in an excel file (template will be provided through the cookbook).
CookbookProvide detailed data preparation• 0-30 cm• Bulk density• Stone content• Stock calculation• Quality assurance• Etc.
Mapping procedures• Mapping techniques (DSM, class
matching, etc.)• Covariates• Uncertainty
Develop e-learning tool.
Roadmap 2017Each workshop participant, to reflect and share…
- Guideline provides GSOC17 specifications
- develop a work plan (who, what, when); coordinate with national focal point
- Feedback to Secretariat: national time frame, method, limitations- :
Timeline• Guidelines – Oct 2016• Cookbook – Jan 2017• Contributions by March to showcase at the
GSCO Symposium•Maps collected by Secretariat – Aug 2017• Compilation of global product – 5 Dec 2017