Modification of the Wiegert‐Evans Method for Estimation of Net Primary Production

Abstract

The assumptions on which the Wiegert—Evans (1964) p aired plots" estimation method of net primary production are based are discussed. An approach is proposed which does not involve the estimation of the disappearance rate of dead plant material and the standing crop of dead vegetation and which uses only measurements of growth of green plant material and of dead plant materials. The Wiegert—Evans method and the modification were compared on a grassland community in Poland. There were no significant differences in the results, but the modified method proved simpler to use.