Biomasa je celotna masa živih bioloških organizmov populacije, ekosistema ali prostorske enote, ki nastane s kopičenjem energije skozi organske procese (Drakou et al. 2015; Reid 2005). ((Drakou, E. G.; Crossman, N. D.; Willemen, L.; Burkhard, B.; Palomo, I.; Maes, J. & Peedell, S. (2015): A visualization and data-sharing tool for ecosystem service maps. Lessons learnt, challenges and the way forward. In: Ecosystem Services 13, p. 134–140.))  ((Reid, W. V. (Ed.) (2005): Ecosystems and human well-being. Synthesis; a report of the Millennium Ecosystem Assessment, MEA - Millennium Ecosystem Assessment & WRI - World Resources Institute. Washington, DC.)) .

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