The invention relates to a method for net photosynthesis (NPS) based quantitative evaluation of the status of coppices. According to the inventive method, the rate of consumption of CO2, which is affected by permanently variable environmental conditions, is determined by means of a device measuring gas exchange, the analysed air has a constant CO2 content, the initial parameters such as volumetric flow rate and physiological variables such as stomatic resistance are measured, and net photosynthesis is calculated from both CO2 consumption and the relevant initial parameters. The method is characterized by subsequent correlation of the CO2 consumption rate and net photosynthesis, thus making it is possible to neutralize the permanently variable environmental conditions affecting the result by virtue of the fact that regression analysis occurs between CO2 consumption and net photosynthesis and by proceeding to re-calculate CO2 consumption and net photosynthesis on this basis if required.
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