Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber

Li, Ming; Kozai, Toyoki; Niu, Genhua; Takagaki, Michiko

doi:10.1016/j.biosystemseng.2012.06.010

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…e P and e R are in proportion to e Np and e Nd , respectively. It is possible to prevent and cause over-or underestimated P n,w and R d,w by diminishing the variation of N p and N d , which may change with the room temperature (Li et al, 2012b). In this experiment, the air conditioner had been operated continuously to maintain the room temperature, even though the room temperature changed sometimes due to the operation of other equipment or human activates and enlarged e P and e R .…”

Section: Discussionmentioning

confidence: 99%

“…The data collected during the first 2 h after both the dark-light transition and the light-dark transition were discarded to ensure that the environmental conditions were stable. Both N P and N d were measured in the absence of plants and calculated following Li et al (2012b). Every 5 d, five transplants were sampled from each treatment to measure the leaf area and dry weight.…”

Section: Methodsmentioning

confidence: 99%

“…Most importantly, the canopy net photosynthetic rate measured with this method can be more accurate than that calculated by scaling up the leaf photosynthetic rate (Ferraz et al, 2016). This method has been applied to measure the P n,w of cucumber transplants (Mun et al, 2011), lettuce (Wheeler et al, 1994a), and tomato seedlings (Li et al, 2012b). Dry weight production also has been estimated based on the CO 2 flux from the canopy measured with such methods (Burkart et al, 2007;Li et al, 2012b;Wheeler et al, 1994b).…”

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confidence: 99%

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Responses of Angelica acutiloba Kitagawa Transplants to Elevated Ambient CO2 Concentration

Li¹,

Song²

2019

horts

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Additional index words. elevated CO 2 concentration, Angelica, canopy net photosynthetic rate, dark respiration rate, dry weight Abstract. Long-term exposure to an elevated ambient carbon dioxide (eCO 2 ) concentration could weaken or diminish the enhancement of plant photosynthesis and growth. To monitor this response and offer references for growth management, the whole-plant photosynthetic rate (P n,w ) and dark respiration rate (R d,w ) of Angelica acutiloba Kitagawa transplants were monitored with a growth chamber. The results showed that eCO 2 increased both the P n,w and R d,w by (79 ± 42) % and (126 ± 51) %. The dry weight of transplants under eCO 2 was 33.6% greater than that under aCO 2 . However, the photosynthetic acclimation to eCO 2 occurred. The increase in the P n,w was maintained until the end of the experiment due to increased leaf area. Moreover, the increase in plant dry weight mainly occurred in the first 15 days of treatment. Furthermore, the dry weight estimated based on the P n,w and R d,w agreed well with the measured dry weight. The relative growth rate (RGR) calculated with the estimated dry weight demonstrated the response of transplant growth to eCO 2 . These results indicated that the proposed method can be used to monitor the response of plant growth to eCO 2 .CO 2 is the substrate for plant photosynthesis. An eCO 2 concentration can stimulate the photosynthetic rate by increasing the substrate availability of Rubisco carboxylation and inhibiting the competitive oxygenation of the enzyme (Long et al., 2004;Stitt and Krapp, 1999). As a result, plants exposed to eCO 2 usually show accelerated growth rates and high yields (e.g.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Responses of Angelica acutiloba Kitagawa Transplants to Elevated Ambient CO2 Concentration

Li¹,

Song²

2019

horts

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“…Harmanto et al (2006b) pointed out that the water vapor balance method had a better estimation accuracy when measured in a greenhouse cultivated with mature plants and with a smaller ventilation opening area. Table 5 shows that the method has been applied in various types of compartments with good results, such as multi-span greenhouses with continuous roof vents only (Boulard and Draoui, 1995;Kittas et al, 2002), those with continuous roof and side vent configurations (Mashonjowa et al, 2010), units with a screen house (Harmanto et al, 2006b;Rigakis et al, 2015), and compartments with growth chambers (Li et al, 2012). Figure 6 illustrates the performance of the water vapor balance method for predicting the air exchange rate (N) in a greenhouse cultivated with tomato plants.…”

Section: Water Vapor Balancementioning

confidence: 99%

The Essential Factor of Ventilation Rate in Prediction of Photosynthetic Rate Using the CO<sub>2</sub> Balance Method

Tusi

Shimazu

2020

RAS

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Monitoring photosynthesis is a fundamental process to improve the yield and quality of plants in a greenhouse. The CO2 balance method is often employed to predict the photosynthetic rate of plants. We reviewed the essential parameters for predicting photosynthetic rates of plants canopy in greenhouses using the CO2 balance method. Even in a naturally ventilated greenhouse, ventilation rate is an essential parameter for the CO2 balance method, but it must be measured in real time as it fluctuates with weather conditions. We studied three types of ventilation rates (the tracer gas, heat balance, and water vapor balance methods). Comparing the measuring techniques of ventilation rate provided us an understanding of the strengths and weaknesses of each method. This knowledge can guide us to choosing the best method based on accuracy, device usage, practicality, and the installation budget. Most researchers have measured and controlled CO2 concentrations in a greenhouse using an infrared gas analyzer and predicted the ventilation rates using the tracer gas method. This method is suitable for the measurement of low and closed ventilation. The estimated ventilation rate by the heat balance method is recommended for large ventilation openings. The water vapor balance method is sufficient for measuring the ventilation rate when there is a large quantity of water vapor due to plant transpiration. The reliability of this method depends on the accuracy of short-term transpiration measurements. Improved water vapor balance techniques can benefit various greenhouse applications with different ventilator configurations, owing to the flexibility and ease of use compared to those of other methods.

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“…Preferably, the tracer should be free of offensive odour. Although gases such as acetylene [22][23][24], ethene [23], N 2 O [19,23], propane [23], water vapour [27], CO 2 or H 2 [25] have been used as tracer gases on some occasions; the most common is sulphur hexafluoride (SF 6 ) [13,14,[16][17][18]21,25,28]. However, the use of alternative tracer gases is desirable since SF 6 is a greenhouse gas.…”

Section: Introductionmentioning

confidence: 99%

Tracer Gas Method Evaluation for Assessing the Energy Potential of Biogas from Chicken Farms in the Canary Islands

Asensio-Ramos,

Melián,

Padrón

et al. 2024

Sustainability

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Biodigestion in farming and agriculture offers environmental and economic benefits, but investing in biodigesters carries real-world risks for enterprises. This study analyzes methane (CH4) emissions from a poultry farm biodigester in Tenerife Island, Canary Islands, Spain, conceptualized as a right-angled prism measuring 45 m wide, 25 m long, and 12 m tall, with an internal volume of approximately 13,500 m3. Using a Neon tracer gas technique, CH4 emission rates were quantified in situ during two surveys in February 2021 and October 2022, capturing seasonal variability in ambient conditions. Biogas analysis was performed using a portable micro-gas chromatograph in less than 5 min, revealing stable CH4 production rates of approximately 200 kg·d−1 (~310 m3·d−1) and 330 kg·d−1 (~500 m3·d−1) for the two experiments, respectively. The composition of biogas indicated CH4 concentrations of around 38–43%, with the remaining composition consisting of carbon dioxide (19–26%), nitrogen (36–27%), oxygen (7–4%), and trace amounts of other gases. A comparison with a theoretical model showed a good correlation. This approach enhances biodigester investment attractiveness by enabling enterprises to optimize efficiency promptly. The obtained data were used to estimate the energy potential of biogas from chicken farms in the Canary Islands.

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Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber

Cited by 15 publications

References 32 publications

Responses of Angelica acutiloba Kitagawa Transplants to Elevated Ambient CO2 Concentration

Responses of Angelica acutiloba Kitagawa Transplants to Elevated Ambient CO2 Concentration

The Essential Factor of Ventilation Rate in Prediction of Photosynthetic Rate Using the CO<sub>2</sub> Balance Method

Tracer Gas Method Evaluation for Assessing the Energy Potential of Biogas from Chicken Farms in the Canary Islands

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