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Introduction
Over the last 10 years, much research has gone into the
effects of increasing CO2 on global warming.
It is also accepted that ambient CO2 concentration will continue to increase for many
years to come before plateauing around 600-700 ppm. It is therefore necessary to predict
the effects of higher CO2 concentrations on plants and the environment in general. Sources
and sinks of CO2 will then need to be studied.
Eddy Covariance is one of the methods to measure the net flux or movement of CO2 into and
out of a plant canopy over distances ranging from 100’s to 1000’s of meters to
give an estimate of net carbon assimilation.
The basic components of an Eddy Covariance system consist of a CO2/H2O analyser, 3-D sonic
anemometer, datalogger , a pump in case of use of a close path analyser ( LIC7000) or without pump if use of an open path analyser (LIC7500). There are four models
of gas analysers :
 There are five models of gas
analysers :
- The LI-820 which is a
lightweight and compact CO2 analyser.
- The LI-840 which is a
lightweight and compact CO2/H2O analyser.
- The LI-7500 which is an
open path CO2/H2O analyser dedicated to Eddy Covariance applications and the LI-7000 which is a closed path CO2/H2O
analyser convenient for both estimating canopy photosynthesis and traditional plant
physiology measurements.
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