Fig. 4

Concentrations of labile state (LS) and complexed state (CS) nitrite (NO2‒LS and NO2‒CS, a), ammonium (NH4 + LS and NH4 + CS, b), phosphate (PO43‒LS and PO43‒CS, c), dissolved organic phosphorus (DOPLS and DOPCS, d) and silicate ion (SiO32‒LS and SiO32‒CS, e) in forest, agriculture, grassland and desert dry-affected soils.