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Updated: Oct 19, 2025

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
Published on: December 16, 2022
Forest GPP Calculation Using Sap Flow and Water Use Efficiency Measurements
Fyodor Tatarinov1, Eyal Rotenberg1, Dan Yakir1
1Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel.
Abstract:
This is a protocol to evaluate gross primary productivity (GPP) of a forest stand based on the measurements of tree's sap flow (SF), 13C derived water use efficiency (WUE), and meteorological (met) data. GPP was calculated from WUE and stomatal conductance (gs), the later obtained from SF up-scaled from sampled trees to stand level on a daily time-scale and met data. WUE is obtained from 13C measurements in dated tree-ring wood and/or foliage samples. This protocol is based on the recently published study of Klein et al., 2016 .
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