Field Measurements of Gas Exchange

1986 ◽  
pp. 117-128 ◽  
Author(s):  
Wolfgang Roether
Keyword(s):  
Gas Exchange ◽  
Field Measurements

Field evidence for the optimality hypothesis of gas exchange in plants

1999 ◽  
Vol 26 (3) ◽  
pp. 239 ◽  
Author(s):  
Pertti Hari ◽  
Annikki Mäkelä ◽  
Frank Berninger ◽  
Toivo Pohja
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Pinus Sylvestris ◽  
Scots Pine ◽  
Field Measurement ◽  
Field Data ◽  
Field Measurements ◽  
Leaf Structure ◽  
Model Parameters ◽  
Field Evidence

The ‘optimality hypothesis’ of gas exchange in plants has been studied since the 1970s, but testing it in the field has proven difficult. A recent reformulation of the hypothesis with detailing assumptions on leaf structure makes it possible to solve the optimisation problem explicitly, such that the predictions of gas exchange are readily testable against field data. This form of the model was tested against field measurements of photosynthesis, transpiration and stomatal conductance in Scots pine (Pinus sylvestris) shoots during three clear summer days. Model parameters were estimated independently from photosynthesis measurements on preceding days. The measurements were carried out at a new field measurement station with a very low level of noise. The predictions of photosynthesis, transpiration andstomatal conductance explained 84–98% of the variance in the data.

scholarly journals Direct measurements of biogenic dimethylsulphide fluxes from the oceans: a synthesis

2004 ◽  
Vol 61 (5) ◽  
pp. 836-844 ◽  
Author(s):  
H J Zemmelink ◽  
J WH Dacey ◽  
E J Hintsa
Keyword(s):  
Gas Exchange ◽  
Field Measurements ◽  
Eddy Correlation ◽  
Trace Gas ◽  
Gas Transfer ◽  
Transfer Rates ◽  
Gas Fluxes ◽  
Direct Measurements ◽  
Powerful Approach ◽  
Trace Gas Fluxes

This paper provides a brief overview of the state-of-the-art of techniques that are currently used for field measurements of trace gas fluxes and the subsequent derivation of gas transfer rates over the oceans. Special attention is given to the relaxed eddy accumulation (REA) and gradient flux (GF) techniques, which rely on empirical functions thus far mainly validated over land. The universality of these functions and their application at sea have not yet been fully evaluated. New experiments have shown that the emission of dimethylsulphide (DMS) can be measured by the REA and GF techniques. Moreover, these measurements have provided parameterizations of gas exchange rates that are within the range of relationships between wind speed and gas transfer that have recently been derived from eddy correlation (EC) and deliberate tracer measurements. Using DMS as a model, gas is potentially a powerful approach to intercalibrate the REA, GF, and EC techniques, test their applicability in the marine environment, and investigate processes that determine trace gas exchange across the ocean surface.

Comparative ecophysiology of CAM and C3 bromeliads. II. Field measurements of gas exchange of CAM bromeliads in the humid tropics

1986 ◽  
Vol 9 (5) ◽  
pp. 377-383 ◽  
Author(s):  
U. LUTTGE ◽  
K.-H. STIMMEL ◽  
J. A. C. SMITH ◽  
H. GRIFFITHS
Keyword(s):  
Gas Exchange ◽  
Field Measurements ◽  
Humid Tropics

An assessment of the relationship between chlorophyll a fluorescence and CO 2 gas exchange from field measurements on a moss and lichen

Planta ◽  
1998 ◽  
Vol 206 (4) ◽  
pp. 611-618 ◽  
Author(s):  
T. G. A. Green ◽  
B. Schroeter ◽  
L. Kappen ◽  
R. D. Seppelt ◽  
K. Maseyk
Keyword(s):  
Gas Exchange ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Field Measurements ◽  
The Relationship
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