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Related Concept Videos

Primary Production01:06

Primary Production

24.2K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Trophic Efficiency00:46

Trophic Efficiency

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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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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.

Bio-Protocol
|September 20, 2021
PubMed
Summary

This study presents a protocol to measure forest gross primary productivity (GPP) using tree sap flow, carbon isotope data for water use efficiency (WUE), and weather data. The method enables daily GPP estimation at the forest stand level.

Keywords:
Ecosystem carbon fluxStable isotopesTranspirationTrees

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Area of Science:

  • Forest Ecology
  • Plant Physiology
  • Biogeochemistry

Background:

  • Accurate estimation of forest gross primary productivity (GPP) is crucial for understanding carbon cycling.
  • Previous methods often lack the integration of multiple physiological and environmental factors.
  • A robust protocol is needed to synthesize sap flow, water use efficiency, and meteorological data.

Purpose of the Study:

  • To present a detailed protocol for evaluating forest stand GPP.
  • To integrate tree-level measurements with stand-level estimations.
  • To utilize 13C-derived water use efficiency (WUE) and sap flow (SF) data.

Main Methods:

  • Calculating GPP from WUE and stomatal conductance (gs).
  • Estimating gs from SF measurements, scaled from individual trees to the entire stand daily.
  • Determining WUE using 13C analysis of tree-ring or foliage samples.

Main Results:

  • The protocol provides a daily time-scale estimation of GPP.
  • It successfully integrates tree physiological data (SF, WUE) with meteorological data.
  • The method is based on the established framework by Klein et al. (2016).

Conclusions:

  • This protocol offers a comprehensive approach to assess forest GPP.
  • It enhances the understanding of forest carbon uptake dynamics.
  • The method is valuable for ecological and climate change research.