Rtuffli: SIGNAL publish from draft v186

2026-05-30T19:53:36Z

SIGNAL publish from draft v186

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{| class="wikitable" style="float:right; clear:right; margin:0 0 1em 1em; width:320px;"
|+ SIGNAL Earth Structured Data
|-
! Object type
| Damage Signal
|-
! SIGNAL Earth ID
| DS-00146
|-
! Observable type
| Soil carbon stock (full profile)
|-
! Unit
| tC (tC)
|-
! Temporal structure
| Periodic
|-
! Monitoring backbone
| —
|}


{{SignalTerm|type=DS|id=DS-00146|label=Soil Carbon Stock (Full Profile)}} refers to the total amount of organic carbon stored within the entire soil profile, typically measured from the surface down to a depth of one meter or more. This carbon pool plays a critical role in the global carbon cycle, influencing soil fertility, ecosystem productivity, and climate regulation. Understanding soil carbon stocks is essential for assessing land health and the potential for carbon sequestration or release under changing environmental conditions.

Soil organic carbon is derived from decomposed plant and microbial residues and is a key component of soil organic matter. It affects soil structure, water retention, and nutrient cycling, thereby supporting terrestrial ecosystems. Variations in soil carbon stocks occur across different ecosystems, soil types, and climatic zones, reflecting complex interactions among biological, chemical, and physical processes.

Accurate quantification of soil carbon stock across the full soil profile provides insight into the state of terrestrial carbon reservoirs and informs models of carbon dynamics. This information is relevant to land management, climate change assessments, and ecological research.

== Geographic / System Context ==
Soil carbon stocks are globally distributed across diverse terrestrial ecosystems, including forests, grasslands, wetlands, agricultural lands, and tundra. The geographic variability in soil carbon content is influenced by factors such as climate, vegetation type, soil texture, topography, and land use history. For example, boreal and tropical forest soils generally contain higher carbon stocks compared to arid or heavily cultivated soils. The vertical distribution of soil carbon also varies, with surface layers typically richer in organic carbon than deeper horizons, although significant carbon can be stored at depth depending on soil formation processes and ecosystem type.

== Monitoring and Measurement ==
Soil carbon stocks are monitored through a combination of field sampling, laboratory analysis, and remote sensing techniques. Soil cores are collected at defined depth intervals to measure organic carbon concentration, which is then converted to carbon stock by accounting for soil bulk density and volume. Standardized protocols ensure comparability across studies and regions. Large-scale assessments rely on meta-analyses of published data, soil databases, and modeling approaches that integrate environmental variables. Institutions such as the Food and Agriculture Organization ([https://en.wikipedia.org/wiki/Food_and_Agriculture_Organization FAO]) and research networks contribute to compiling and harmonizing soil carbon data globally.

Within the SIGNAL system, this phenomenon is treated as a defined environmental signal whose boundaries and measurement conventions are described below.

== Signal Definition ==
The Soil Carbon Stock (Full Profile) signal quantifies the total mass of organic carbon contained within the entire soil profile, expressed in metric tons of carbon per unit area (tC). It encompasses all soil horizons from the surface down to a specified depth, typically up to 100 centimeters or more, capturing the cumulative organic carbon content stored in the soil matrix.

== Boundary Conditions ==
Boundary inclusions for this signal comprise all organic carbon present within the soil profile to the defined depth, including carbon associated with soil organic matter, particulate organic carbon, and stabilized humic substances. Exclusions involve inorganic carbon forms such as carbonates, carbon in plant biomass above the soil surface, and carbon contained in soil organisms not directly measured as part of the soil organic carbon pool. The signal does not include carbon in surface litter or deadwood unless incorporated into the soil matrix.

== Aggregation Semantics ==
Geographically, soil carbon stock data are aggregated across defined spatial units such as ecosystems, biomes, or administrative regions to assess regional and global carbon pools. Temporally, the signal is periodic, reflecting changes over time scales relevant to soil carbon turnover and land use dynamics. Cross-signal aggregation may involve integration with related environmental signals such as soil moisture, land cover change, and greenhouse gas fluxes to provide comprehensive assessments of soil health and carbon cycling. Aggregation methods account for spatial heterogeneity and temporal variability to support robust interpretations.

== Observational Status ==
Current monitoring of soil carbon stocks relies on periodic field measurements and synthesis of global datasets, with ongoing efforts to improve spatial coverage and temporal resolution. Data gaps exist in certain regions and soil depths, limiting comprehensive assessment. Future SIGNAL releases aim to incorporate enhanced monitoring backbones, including remote sensing proxies and standardized soil carbon inventories, to improve the accuracy and timeliness of soil carbon stock assessments. Integration with other environmental signals will support multidimensional analysis of terrestrial carbon dynamics.

== Related Signals ==
* None specified


== Key Associated People ==
* '''H. Wang''' [Lead author]



== Sources ==
* [https://essd.copernicus.org/articles/17/3375/2025/ Global patterns of soil organic carbon distribution in the 20–100 cm soil profile for different ecosystems: a global meta-analysis — 2025]

Soil Carbon Stock (Full Profile) - Revision history

Rtuffli: SIGNAL publish from draft v186