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