“…The same is true for the fraction of occluded particulate organic matter (oPOM), which reflects regeneration of the soil structure (Jastrow, ; Six, Elliott, & Paustian, 1999). Both fPOM and oPOM fractions are sensitive to changes in vegetation type and the corresponding amount and composition of plant residues (Kalinina et al, , ; Kalinina et al, ; Kalinina, Goryachkin, Karavaeva, Lyuri, & Giani, ). For example, large contribution of these fractions with density below 2.0 g cm −3 to total SOM is common in forest soils (Besnard, Chenu, Balesdent, Puget, & Arrouays, ; Grüneberg, Schöning, Hessenmöller, Schulze, & Weisser, ; Grünewald, Kaiser, Jahn, & Guggenberger, ; John, Yamashita, Ludwig, & Flessa, ; Yamashita, Flessa, John, Helfrich, & Ludwig, ).…”