GSOC map Introduction to SOC mapping GSOC mapping guideline Product specifications Existing SOC maps Methodologies

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 collection of national SOC estimates, utilizing as many soil data as possible, could provide a new reliable layer of reference SOC stocks around the globe .

GSOC map was initiated by UNCCD-SDI and GSP-ITPS

Background

Scharlemann et al 2014

“Climate change models are currently using soil carbon estimates that vary by an order of magnitude. We’re creating scenarios of climate change, and basing decisions on these scenarios, even though the input data are actually really uncertain.”

“Decisions on soil carbon management require an improved understanding of the global variation in carbon stocks, as well as their importance relative to carbon stored in vegetation.”

Rosser et al 2012

Background

Ladd et al 2012

“The lack of correlation between the measured values of soil carbon and the values from the FAO harmonized world soil map indicate that substantial improvements in the production of soil carbon maps are needed and possible..”

National coordination Reporting under SDG 15.3.1, subindicator soil carbon, linking soils

with national agro-environmental statistics Support to UNCCD LDN target setting programme, soil carbon is

progress indicator Reporting under UNFCCC GHG programme (LULUCF soil C pool and

pool changes): GSOC map allows for Tier 2 reference C stocks Soil carbon as indicator for soil health and land resilience in

national mitigation and adaptation programmes

International coordination UNFCCC – UNCCD – WMO - GSP conference: GSOC17, March 2017 GSP Pillar 4 productsITPS /Status of the world soil resources

GSP GSOC mapping guideline: Country-driven approach Generate national SOC maps as 1 km 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 (it is possible to subdivide depth classes, e.g. following GlobalSoilMap specifications: 0-5 cm, 5-15 cm, 15-30 cm, lower depth classes > 30 cm are optional for GSOC map, but will be included in Pillar 4 soil grids)

Build on existing national capacities and extend these Develop first indicator for the Global Soil Information System

(GSIS) - GSP demonstration project (Version 0 soil grids)

Methodical considerations

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

Detailed SpecificationsSpecification 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 analyzed.

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 bulk density

Derive data from soil horizons for d = 0-30 cm

Detailed Specifications 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

Detailed Specifications Metadata

Data sharing procedure National SOC maps 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).

Cookbook previous and future workshops

Capacity planning/development

Implementation

To prepare the cookbook, an extensive literature review has been conducted.

Cookbook and e-learningA cookbook for SOC mapping is currently prepared by voluntary input from an open team of authors. If you have interest to contribute based on national experiences in SOC mapping, contact: rainer.baritz@fao.org Together with the cookbook, an e-learning tool will be made available.

41 c

Publications about national SOC map activities were found for 41 countries.

8. Literature8.1 General Literature on SOC inventories and spatial modelling (19)8.2 Specialized methodical literature8.2.1 Bulk density (22)8.2.2 Digital Elevation Models (6)8.2.3 Inorganic carbon (1)8.2.4 Digital Soil Mapping (21)8.2.5 Vertical SOC, Depth profiles (8)8.2.6 Rock content (1)8.2.7 Soil carbon analysis (3)8.2.8 Soil carbon monitoring (5)8.2.9 Remote sensing, spectroscopy (5)8.2.10 Uncertainties (4)8.3 National SOC inventories8.3.1 North America (2C, 4)8.3.2 Near East and Sub-saharan Africa (9C, 12)8.3.3 Asia (6C, 9)8.3.4 Central/South America (2C, 2)8.3.5 Pacific (2C, 5)8.3.6 Eurasia (1C, 3)8.3.7 Europe (19C, 45 / 1Europe, 4)8.4 Regional SOC inventories (18C 20)

Cookbook literature overview

[C = countries]

Capacity planning

Planning of national capacity (personnel, time)Planning of additional needs (equipment, training)

Capacity planning

- reflect about the guideline and how to implement

Each workshop participant, to reflect and share…

- choose national approach - contact relevant national

institutions

- INSII member to contact national focal point, also RSP colleagues (P4) not attending this workshop

- develop a work plan (who, what, when); coordinate with national focal point

Basis for RSP/GSP secretariats to plan actions.

Digitize any SOC data from sampling if not done so (e.g. from soil profile description and analysis)Collect SOC concentration data, Buld density (BD), stones (coarse fragments), spatial coordinates

Preparatory technical stepsPrepare soil profile data:

Prepare covariates: soil, geology, climate, land cover, land form (simple and complex relief indicators)

Calculate SOC stocks for 0-30 cm (= forest floor is possible)

Technical SOC mappingsee presentation by G. F. Olmedo