Proxies for use in biochar decay models: Hydropyrolysis, electric conductivity, and H/Corg molar ratio - Nikolas Hagemann; Hans-Peter Schmidt; Thomas D. Bucheli; Jannis Grafmüller; Silvio Vosswinkel; Volker Herdegen; William Meredith; Clement N. Uguna; Colin E. Snape (PLoS ONE, 2025)