Measuring Photosynthetic
Rates of Turf

The aim of turf measurements may be to look at photosynthetic rates in established grass plots to compare the effects of treatments such as fungicides, insecticides, fertilizers and other amendments. Another application may be to compare different species or varieties of turfgrasses to understand their response to biological, chemical or environmental factors. A fungicide, in addition to controlling disease, may also adversely affect photosynthetic rates or stomatal conductance. The LI-6400XT system is a powerful and versatile research tool that can be used to measure individual leaves with one of the leaf chambers, or can be adapted to measure whole canopies. A custom chamber kit is available to design your own whole-canopy turf chamber which can be placed over growing turf to measure net canopy photosynthetic rates. One challenge of taking whole-canopy gas exchange measurements (whether of turf or other plants) is the possibility that soil CO2 flux can contribute to the chamber CO2, and thus underestimating the photosynthetic rate. Fortunately, it is possible to maintain an adequate air-flow rate through the chamber and properly seal the chamber against the soil, in order to keep the chamber pressure above ambient atmospheric pressure, almost entirely suppressing soil CO2 emissions. An important difference between individual leaf-level gas-exchange measurements and canopy-level measurements is the greater complexity of the canopy; there can be variations in leaf area and angular distribution, leading to variations in illumination intensity on individual leaves, and other such issues. Despite these constraints, canopy measurements are still useful when used in a comparative way — e.g. comparing the effects of different treatments on the same turf plots. For more information, contact LI-COR to discuss your application.

LI-COR's Solution for Studying Turf Measurements:

The LI-6400XT Portable Photosynthesis System

The LI-6400XT system is a compact, rugged, field portable instrument able to provide researchers with detailed information on plant responses such as CO2 assimilation rates, stomatal conductance, intercellular CO2 concentrations, carboxylation and light use efficiencies, and CO2 and light compensation points.

6400-19 Custom Chamber Kit

6400-19 Custom Chamber Kit

The 6400-19 kit contains commonly required accessories in order to interface a custom chamber to the LI-6400XT sensor head. Parts included are the sample optical path mounting plate and screws, Teflon tape, thermocouple wire and connector, exhaust air tubing, and O-rings.

LI-8100-NCE Net Carbon Exchange Package

The LI-8100-NCE Net Carbon Exchange Package is designed for scientists interested in quantifying the net carbon exchange between an ecosystem and the atmosphere using the chamber based method. This package includes the LI-8100A Analyzer Control Unit, 8100-104C Clear Chamber, LI-190 Quantum Sensor, 8100-202 Soil Moisture Probe, 8100-203 Thermistor Probe, 8100-564 Wireless package, 8100-604 Leveling Stake, and an Amplifier.

This package is a one chamber option for computing NCE. This system can be used in both a long-term and survey mode depending on their research objectives.

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