The Fraction of Carbon in Soil Organic Matter as a National‐Scale Soil Process Indicator

Summary

This European meta-analysis of over 9500 soil measurements demonstrates a tight relationship between the fraction of soil organic carbon in soil organic matter and habitat type, vegetation characteristics, and soil physical properties. The authors show that fSOC follows a distinct habitat gradient, with lowest values in seagrass sediments and permafrost, intermediate values in croplands, and highest values in semi-natural grasslands and woodlands. The findings suggest that fSOC could serve as a national-scale soil process indicator to predict spatial variations in soil carbon fractionation, with applications for agricultural management, land-use planning, and climate-related soil carbon tracking.

UK applicability

The study included multiple European datasets and thus likely encompasses UK soil conditions across arable, grassland and woodland systems. The habitat-gradient framework and fSOC metric could be applied to UK soil monitoring programmes and land-use planning to improve predictions of soil carbon storage and inform policies on soil carbon sequestration targets.

Key measures

Fraction of soil organic carbon in soil organic matter (fSOC), ranging 0.38–0.58; particulate organic carbon (POC); mineral-associated organic carbon (MAOC); soil organic matter content; habitat classification

Outcomes reported

The study analysed the fraction of soil organic carbon in soil organic matter (fSOC) across 9503 measurements from 14 European datasets, examining relationships between fSOC, habitat type, soil physical properties, and carbon storage in particulate and mineral-associated organic matter fractions. The research demonstrated that fSOC varies systematically across habitat gradients from seagrass sediments and permafrost through croplands to semi-natural grasslands and woodlands, providing a potentially predictive tool for spatial variation in soil carbon distribution.

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