Summary
This study presents a mechanistic model linking soil temperature and moisture to heterotrophic respiration across scales from pore to global level. Historical analysis shows heterotrophic respiration has accelerated approximately 2% per decade since 1980; climate projections suggest a substantial 40% increase globally by 2100 under worst-case scenarios, with Arctic regions experiencing disproportionate increases driven primarily by moisture decline rather than temperature rise.
Regional applicability
UK soils and agricultural systems are subject to changing temperature and precipitation regimes; the model's findings on moisture sensitivity are particularly relevant to UK policy on soil carbon management and climate adaptation. The study's global scope provides contextual data but specific UK validation and regional downscaling would strengthen applicability to British farming and land management practices.
Key measures
Soil heterotrophic respiration rates (carbon efflux); soil temperature; soil water content; decadal change rates (% per decade); projected percentage increases in respiration by 2100
Outcomes reported
The study developed and validated a mechanistic model predicting soil heterotrophic respiration rates across micro to global scales under varying temperature and moisture conditions. Model estimates showed heterotrophic respiration has increased at ~2% per decade since the 1980s, with projections of ~40% increase by end-of-century under high emissions scenarios.
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