Presence-absence sampling for estimating plant density using survey data with variable plot size

Göran Ståhl, Magnus Ekström, Jonas Dahlgren, Per-Anders Esseen, Anton Grafström & Bengt Jonsson
1. Presence-absence sampling is an important method for monitoring state and change of both individual plant species and communities. With this method only the presence or absence of the target species is recorded on plots and thus the method is straightforward to apply and less prone to surveyor judgment compared to other vegetation monitoring methods. However, in the basic setting all plots must be equally large or otherwise it is unclear how data should be...
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