Mechanical thresholds constrain global peatland carbon accumulation

Peatlands are crucial carbon reservoirs, yet their long-term growth may be limited by mechanical instability, a new study finds. Researchers developed a two-dimensional model to evaluate how mechanical and ecohydrological processes affect peat accumulation across slopes ranging from 0° to 12°. By comparing stress distributions to known strength values, they identified critical peat depths where instability occurs, predicting failure modes such as bog bursts and peat slides.

The model indicates that many peatlands could reach mechanical failure before reaching their expected carbon storage potential. The findings show that mechanical constraints could limit global peat accumulation to 1.48 times their present volume, far below the 1.71-fold increase anticipated in carbon sequestration projections. Incorporating these mechanical thresholds into peatland restoration and climate strategies is essential.

Support for this research was provided by ITB's 2025 Research Programme with grant 841/IT1.B07.1/TA.00/2025.