Primärsuccession

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Rangitotolavapath.jpg
(c) Nevilley at the English Wikipedia, CC BY-SA 3.0
Lava field with path and encroaching vegetation. Note that despite appearances this is loose rock, not ploughed-up soil. See Rangitoto Island article text for details.
Primary Succession Diagram.svg
Författare/Upphovsman: Rcole17, Licens: CC BY-SA 4.0
Primary succession occurring over time. The soil depths increase due to decomposition of plant matter and there is a gradual increase of species diversity in the ecosystem.