http://www.cnr.it/ontology/cnr/individuo/prodotto/ID51661
Open-System chamber for measurements of gas exchanges at plant level (Articolo in rivista)
- Type
- Label
- Open-System chamber for measurements of gas exchanges at plant level (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Alternative label
Alterio, G., Giorio, P., Sorrentino, G (2006)
Open-System chamber for measurements of gas exchanges at plant level
in Environmental science & technology
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Alterio, G., Giorio, P., Sorrentino, G (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Alterio, G.; Giorio, P.; Sorrentino, G. CNR-I.S.A.FO.M. (literal)
- Titolo
- Open-System chamber for measurements of gas exchanges at plant level (literal)
- Abstract
- Gas exchanges of whole canopy can be studied by
covering entire plants with a chamber and using portable
infrared gas analyzers (IRGAs) to measure CO2 and H2O
exchanged with the air blown through the chamber enclosure.
The control of temperature rise inside the chamber,
which should be kept low, and the accurate measurement
of the air flow are two crucial aspects for realistic and
precise estimation of photosynthesis and transpiration. An
automated open-system plant chamber (clear flexible
balloon enclosure) for small plants was developed to
ameliorate such a technique. The temperature rise is here
predicted by heat balance analysis inside the chamber.
The analysis shows that when as much as 500 W m2 of solar
radiation is converted to sensible heat, a flow rate of
0.98 mol s-1 (!20 L s-1) of air blown into a cylindershaped
enclosure (0.8 m high, 0.5 m wide) is adequate to
limit temperature increase to 2 K. An improved calibration
for the measurement of the chamber airflow was obtained
by combining the use of a Pitot tube anemometer with
the classical CO2 injection approach. The concentration
increase due to the injection of CO2 at a known rate into
the chamber was predicted by the air flow calculated from
the \"Pitot\" air velocity. The turbulent regime of air
assured that a single-point Pitot measurement was enough
for a good estimation (slope ) 0.99; R2) 0.999) of the
actual air flow. The open-system chamber was tested on
potted sunflower (Helianthus annuus, L.) and maize
(Zea mays, L.) plants under variable solar radiation,
temperature, and air humidity during the daytime. As
expected, similar rates of maximal leaf-area based
photosynthesis (about 40 ?mol m-2 s-1) were observed in
the two species confirming the reliability of our system.
The consistency of data also resulted from the typical
relationships observed between photosynthetic rate and
light. (literal)
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