Features:
The LI-6800 Portable Photosynthesis System is capable of measuring combined gas exchange and fluorescence from leaves and aquatic samples with following features:
Automatic water vapor control. LI-6800 humidify or dry the air stream independently of flow rate. The instrument rapidly adjusts to whatever humidity setting you specify and precisely controls water vapor over the course of a measurement. With more humidity control flexibility, you can make more precise vapor pressure difference (VPD) measurements.
The Dynamic Assimilation™ Technique. When recording CO2 response curves using steady-state measurements, each point may take 90 to 120 seconds, requiring up to 35 minutes to record sufficient data to estimate the maximum velocity of carboxylation (Vc,max) and maximum rate of electron transport (Jmax). The Dynamic Assimilation™ Technique (DAT), however, provides comparable data in a fraction of the time. The LI-6800 features high air flow rates, excellent mixing of sample air, and minimal tubing between the infrared gas analyzers and leaf chamber, which in turn, provide high-speed measurements and fast response times.
This combination of features enables a reformulation of the assimilation equation such that steady state conditions are not a strict prerequisite for accurate gas exchange measurements. The new method is called the Dynamic Assimilation™ Technique.
DAT is superior to the RACiR (Rapid A-Ci Response) technique and steady-state measurements in several fundamental ways.
Eliminates the empirical empty chamber measurement and post processing required by RACiR.
Faster measurements – provides high-density CO2 response curve data in less time than traditional steady-state measurements.
Uncompromised data quality – data collected with DAT are comparable to traditional steady-state measurements.
Notes to users:
First-time users must be trained by equipment-in-charge before they can use the instrument independently.
Contact information:
Location: U003, G/F, Block U, The Hong Kong Polytechnic University
Equipment-in-change: Dr. Kenneth Yan (Office: U003)
Email: kenneth.yan@polyu.edu.hk
Telephone: 2766 4690
