regrowth / biofilm
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regrowth
In forestry and agriculture, the totality of young, regrowing plants, especially trees, in a particular area.
Der Förster prüft regelmäßig den Aufwuchs im neu bepflanzten Waldstück.
The forester regularly checks the regrowth in the newly planted section of forest.
'Der Aufwuchs' comes from the verb 'aufwachsen' (to grow up/grow). So it describes what 'aufwächst' (grows) — either young plants growing out of the ground or organisms growing on a surface.
Der Aufwuchs von Algen am Schiffsrumpf verlangsamt die Fahrt.
The growth of algae on the ship's hull slows the journey.
This word belongs mainly to technical language. It is used especially in forestry, biology, and aquaristics.
Der Biologe untersucht den Aufwuchs auf den Korallen.
The biologist is examining the biofilm on the corals.
'Aufwuchs' is a collective term and is almost always used in the singular, even when talking about many individual plants or organisms.
Nach dem Waldbrand erholt sich der Aufwuchs nur langsam.
After the forest fire, the regrowth is recovering only slowly.
offspring / young talent
'der Nachwuchs' and 'der Aufwuchs' sound similar, and both have to do with something young or regrowing. 'Nachwuchs' is used for children, young animals, or young talent in a field. So it is usually about people or animals. 'Aufwuchs' is a technical term for young plants in agriculture and forestry, or for a layer of small living organisms in water. The words are easy to confuse because both refer to growth. In everyday language, however, you almost always say 'Nachwuchs' when talking about people or animals. 'Aufwuchs' fits more in nature, agriculture, or biology.
Im Wald schützt ein Zaun den jungen Aufwuchs vor Rehen.
In the forest, a fence protects the young regrowth from deer.
Der Verein sucht neuen Nachwuchs für die Jugendmannschaft.
The club is looking for new young talent for the youth team.