Design and performance of a portable gas exchange chamber system for CO2- and H2O-flux measurements in crop canopies

Burkart, Stefan; Manderscheid, Remy; Weigel, Hans‐Joachim

doi:10.1016/j.envexpbot.2007.02.007

Cited by 58 publications

(55 citation statements)

References 37 publications

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“…However, chamber measurements are prone to a variety of potential errors, such as modifications in the enclosed microclimate, pressure artifacts, and spatial heterogeneity (Livingston and Hutchinson, 1995;Welles et al, 2001;Davidson et al, 2002). These drawbacks have limited the application of the chamber technique for NEE measurements; nevertheless, it is an alternative method that can be used when the EC method is not suitable (e.g., Burkart et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Comparison between eddy covariance and automatic chamber techniques for measuring net ecosystem exchange of carbon dioxide in cotton and wheat fields

et al. 2013

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Abstract. Static and transparent automatic chamber (AC)technique is a necessary choice for measuring net ecosystem exchange (NEE) of carbon dioxide (CO 2 ) in circumstances where eddy covariance (EC) technique is not applicable. However, a comparison of the two techniques for measurements on croplands has seldom been undertaken. We carried out NEE observations in a cotton field (for one year) and a winter wheat field (for one cropping season) using both AC and EC techniques, to (a) compare the NEE fluxes measured using each technique, and (b) test the NEE measurement performance of an automatic chamber system (AMEG), which was designed for simultaneous flux measurements of multiple gases. The half-hourly NEE fluxes measured with the two techniques were in approximate agreement, with the AC fluxes being 0.78 (cotton) and 1.06 (wheat) times the size of the EC fluxes. When integrated to daily timescale, the fluxes of the two techniques were in better agreement, showing an average ratio of 0.94 and 1.00 for the cotton and wheat, respectively. During the periods with comparable field conditions and normal performance of both instruments, the cumulative NEE fluxes revealed small differences between the two techniques (−9.0 % ∼ 7 %, with a mean of 0.1 %). The measurements resulted in an annual cumulative NEE of −40 g C m −2 yr −1 (EC) and −42 g C m −2 yr −1 (AC) in the cotton field, and a seasonal cumulative NEE of −251 g C m −2 (EC) and −205 g C m −2 (AC) in the wheat field. Our results indicate that, for cropland populated by short plants, the AMEG system and the data processing procedures applied in this study are able to provide NEE estimates comparable to those from EC measurements.

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Section: Introductionmentioning

confidence: 99%

Comparison between eddy covariance and automatic chamber techniques for measuring net ecosystem exchange of carbon dioxide in cotton and wheat fields

et al. 2013

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“…In large areas with homogeneous topography and soil cover, micro-meteorological techniques, such as eddy covariance (Baldocchi et al 1988), can measure ecosystem CO2 fluxes without altering canopy environment (Foken et al 2012). On the other hand, for heterogeneous multi-specific community like ecotonal and transitional areas, plot size experiments, or forest understory vegetation the canopy chamber technique can be a suitable alternative that provides reliable data (Steduto et al 2002, Schaaf et al 2005, Burkart et al 2007.…”

Section: Introductionmentioning

confidence: 99%

Canopy Chamber: a useful tool to monitor the CO2 exchange dynamics of shrubland

Guidolotti¹,

Dato²,

Liberati³

et al. 2017

iForest

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A transient state canopy-chamber was developed to monitor CO2 exchange of shrubland ecosystems. The chamber covered 0.64 m 2 and it was modular with a variable height. Several tests were carried out to check the potential errors in the flux estimates due to leakages and the environment modifications during the measurements inside the chamber. The laboratory leakages test showed an error below 1% of the flux; the temperature increases inside the chamber were below 1.3 °C at different light intensity and small pressure changes. The radial blowers inside the chamber created different wind speed at different chamber height, with faster speed at the top of the chamber and the minimum wind speed that was recorded at soil level, preventing detectable effects on soil CO2 emission rates. Moreover, the chamber was tested for two years in a semi-arid Mediterranean garrigue, identifying a strong seasonality of CO2 fluxes with the highest rates during spring and lowest rates recorded during the hot dry non-vegetative summer.

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“…These systems impose changing conditions for plants located inside, and they are used for short periods of time (a few minutes). Longer measurements require an effective control of the microclimate in the chamber, a technology that would considerably increase the cost of the measuring device (Burkart et al, 2007). Open systems, in contrast, are cheaper to run and have continuous ventilation, which allows more accurate gas exchange measurements for days or weeks (Burkart et al, 2007;Poni et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Open systems, in contrast, are cheaper to run and have continuous ventilation, which allows more accurate gas exchange measurements for days or weeks (Burkart et al, 2007;Poni et al, 2014). Open chambers have been extensively used under field conditions to determine gas exchange at the whole plant in trees (Medhurst et al, 2006;Barton et al, 2010), shrubs (Stannard and Weltz, 2006), and herbaceous crops (Balogh et al, 2007;Burkart et al, 2007;Müller et al, 2009). These studies have mainly assessed the effects of crop management (e.g.…”

Section: Introductionmentioning

confidence: 99%