• J. P. Ondok
Part of the Ecological Studies book series (ECOLSTUD, volume 28)


The instantaneous net efficiency of assimilation in any plant stand may be expressed by the ratio: dW/Ldt where dW is the increment in total stand biomass (expressed in terms of dry weight) over the time interval dt and L is leaf area index (leaf area per unit ground area) representing the main part of assimilatory plant tissues. Integration of this ratio over a certain growth interval (t 2 - t 1) gives the “net assimilation rate” (NAR) which express the mean net efficiency of photosynthesis within this interval:
$$ {\text{NAR = }}\int\limits_{{t1}}^{{t2}} {\frac{\text{dW}}{{\text{Ldt}}}} {\text{dt}} $$
Various formulae for the calculation of NAR obtained under different assumptions concerning the growth curves of W and L are given in various papers and manuals (see, e.g., Květ et al., 1971; Ondok and Květ, 1971).


Leaf Area Leaf Area Index Dark Respiration Leaf Inclination Underground Biomass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1978

Authors and Affiliations

  • J. P. Ondok

There are no affiliations available

Personalised recommendations