Fig. 1

Concentrations of labile state (LS) and complexed state (CS) dissolved organic carbon (DOC_LS and DOC_CS, a), dissolved inorganic carbon (DIC_LS and DIC_CS, b), sulfate (SO₄^2‒_LS and SO₄^2‒_CS, c), nitrate (NO₃^‒_LS and NO₃^‒_CS, d) in forest, agriculture, grassland and desert dry-affected soils.