Figure 2.

Atomic force microscopy images of soil colloids with (b, d, and f) and without (a, c, and e) fungus extract addition. (a) Colloids from the surface layer of dark brown forest soil; (b) colloids from the surface layer of dark brown forest soil + fungus extract; (c) colloids from the deep layer of dark brown forest soil; (d) colloids from the deep layer of dark brown forest soil + fungus extract; (e) colloids from saline-alkali soil; (f) colloids from saline-alkali soil + fungus extract.