Applicability of soil column incubation experiments to measure CO2 efflux

Guo, Lei; Nishimura, Taku; Imoto, Hiroaki; Sun, Zhigang

doi:10.1515/intag-2015-0047

Cited by 9 publications

(4 citation statements)

References 39 publications

(36 reference statements)

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“…The closed chamber method has also been employed in the laboratory where soil cores are extracted from the field and placed in columns with their bases capped (e.g., Jansen 2008;Guo et al 2015;Susilawati et al 2016), with the advantage that environmental conditions can be regulated. During a gas sampling event, a removable bung with two holes (a pressure vent and a sampling port, see Figure 1), is placed on the column through which headspace air can be sampled.…”

Section: Closed Chamber Methods Introductionmentioning

confidence: 99%

Evidence of Stabilized Peat as a Net Carbon Sink

Duggan

McCabe

Goggins

et al. 2019

J. Mater. Civ. Eng.

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Mass stabilisation, a ground improvement solution used for construction in peatlands, involves mixing suitable dry binders into the peat to create a homogenous mass, that strengthens and stiffens the peat. A previous pilot study of the carbonation process in stabilised peat showed that it can be a net sink of CO2, as the binder takes in CO2 from the atmosphere and any CO2 released by oxidised peat due to carbonation. In this study extensive laboratory experiments were undertaken to investigate the key factors affecting the CO2 intake rate. A closed chamber method was applied over approximately 6 months to stabilised peat to calculate this rate. The studies revealed that both an increased cement content and a larger surcharge contributed to a larger CO2 intake rate. These intake rates decreased logarithmically with time, and surcharge was found to be a less dominant factor in influencing the CO2 intake rate over time. It was observed that the CO2 intake rate declined when a decrease in CO2 concentration occurred, and the replacement of cement with ground granulated blast-furnace slag had a negative effect on the CO2 intake rate due to its lower carbonation potential. Furthermore, a high water table resulted in a decrease in the CO2 intake rate. These laboratory results have highlighted that dry soil-mixing has a minimal on-site impact in environmental terms, and the consideration of the factors affecting flux rates will allow geotechnical engineers to make more informed decisions on the suitability of this technique for construction projects. Table 5-Boundary conditions for input variables for sensitivity analysis for Studies A and B Study A Study B

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Section: Closed Chamber Methods Introductionmentioning

confidence: 99%

Evidence of Stabilized Peat as a Net Carbon Sink

Duggan

McCabe

Goggins

et al. 2019

J. Mater. Civ. Eng.

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“…Column was fixed on a tyrofoam base properly insolated to prevent soil water loss and keeping at 60 % of field capacity, which was constantly weighted with water addition when requested. This study was developed in incubation due to the controlled experimental conditions as demonstrated by 15,28 . The setup was left in an open laboratory environment at a controlled temperature (25 °C),…”

Section: Soil and Residues Incubationmentioning

confidence: 99%

How Does N Mineral Fertilizer Influence the Crop Residue N Credit?

Almeida¹,

Silva²,

Wendling³

2020

Preprint

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In no-tillage systems, there is an accumulation of crop residues (CR) which plays an important role in available of soil-N. A study was set up to provide information regarding the CR N credit, and the influence of N mineral fertilizer. An incubation was run in a loam soil with addition of a similar rate of residue (10 Mg ha-1; sugarcane, soybean, and brachiaria) and N mineral fertilizer (urea; 120 kg N ha-1). After the stabilization of biological activity, soil and remaining residues were collected, and N monitored. Results showed that the N credit was positive with application of soybean, sugarcane, and brachiaria. There was an expressive performance of soybean N credit represented by a positive balance, and a reduction from 2.49 to 0.9 g kg-1 of N in residue, with direct increase of 90% of soil-N. There is no need of N fertilizer to potentialize the soybean N credit, but it is requested to potentialize N credit of brachiaria and sugarcane. The urea demonstrated be a good enhancer of brachiaria N credit, but it was not adequate to sugarcane residues. Based in our result, the accumulation and incorporation of CR can be considered as a N credit with positive contribution in soil-N.

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Section: Soil and Residues Incubationmentioning

confidence: 99%

How Does N Mineral Fertilizer Influence the Crop Residue N Credit?

Almeida¹,

Silva²,

Wendling³

2020

Nitrogen

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In no-tillage systems, there is an accumulation of crop residues (CR), which plays an essential role in the availability of soil-N. A study was set up to provide information regarding the N credit and the influence of N mineral fertilizer. There was the addition of a similar rate of residue (10 Mg ha−1; sugarcane, soybean, and brachiaria) and N mineral fertilizer (urea; 120 kg N ha−1) in loam soil. After the stabilization of biological activity (73 days), soil and remaining residues were collected, and C and N monitored. The results showed that the N credit was positive with the application of soybean, sugarcane, and brachiaria. There was a positive balance of the soybean N credit in soil with a reduction from 2.49 to 0.90 g kg−1 of N in remaining residue, and a direct increase of 90% of soil-N. There is no need of N fertilizer to potentialize the soybean N credit, but it is required to potentialize N credit of brachiaria and sugarcane. The urea demonstrated to be an excellent enhancer of brachiaria N credit, but it was not adequate for sugarcane residues. Based on our result, the accumulation and incorporation of CR can be considered as N credit with a positive contribution in soil-N.

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Applicability of soil column incubation experiments to measure CO2 efflux

Cited by 9 publications

References 39 publications

Evidence of Stabilized Peat as a Net Carbon Sink

Evidence of Stabilized Peat as a Net Carbon Sink

How Does N Mineral Fertilizer Influence the Crop Residue N Credit?

How Does N Mineral Fertilizer Influence the Crop Residue N Credit?

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