Assessing soil CO2 efflux using continuous measurements of CO2 profiles in soils with small solid-state sensors

Tang, Jianwu; Baldocchi, Dennis; Ye, Qi; Xu, Liukang

doi:10.1016/s0168-1923(03)00112-6

Cited by 293 publications

(319 citation statements)

References 39 publications

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“…The CO2 diffusion coefficients were obtained from these curves. These coefficients are in agreement with those obtained by previous studies (Jabro et al, 2012;Tang et al, 2003;Turcu et al, 2005).…”

Section: Co2 Gaseous Diffusion Coefficientsupporting

confidence: 93%

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Pla

Cuezva

Martı́nez-Martı́nez

et al. 2017

CATENA

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The soils above caves represent a membrane that regulates the connection between the underground environment and the outside atmosphere. In this study, soils from two different field sites (Cueva de Altamira and Cueva del Rull in Spain) are investigated. Field results are analysed and linked to laboratory tests. Several laboratory experiments are performed to quantify CO2 diffusion coefficients and water infiltration rates in these soils under different degrees of soil water saturation and compaction.Tests confirm that the grain size distribution, organic matter content, mineral composition and water content of soils affect gas transport through the soil pore network. Both field and lab results reveal that Altamira soil has a coarser texture and therefore has higher CO 2 diffusion coefficients, infiltration rates and hydraulic conductivity values than Rull soil. Rull soil contains a higher proportion of fine particles and organic matter, which explains the lower fluid transport coefficients.When soils are near saturation, fluid transport does not depend on the physical properties of soil but depends on the soil water content. In this state, liquid transport regulates the available space within the soil pores, which leads to a reduction in the gaseous diffusion coefficient of the soil. After rainfall episodes, the connection between the exterior atmosphere and underground cavities is hindered due to a rise in the soil water content, which is responsible for the closure of the overlying membrane. This study demonstrates that soil-produced CO2 reaches the underground atmosphere through diffusion processes that are controlled by the intrinsic properties of soil (porosity, grain size distribution, texture, mineralogy and organic matter content) and soil water content.

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Section: Co2 Gaseous Diffusion Coefficientsupporting

confidence: 93%

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Pla

Cuezva

Martı́nez-Martı́nez

et al. 2017

CATENA

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“…As seen above, in this semiarid region, major rainfalls will be responsible for major soil productions. And as established previously by other authors (Tang et al, 2003;Turcu et al, 2005;Jabro et al, 2012) the gaseous diffusion through soil will vary in accordance to the water content in soil.…”

Section: The Role Of Rull Cave In the Soil-produced Co2 Redistributiosupporting

confidence: 57%

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Pla

Cuezva

Garcia-Anton

et al. 2016

Science of The Total Environment

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This study is based in a field monitoring of a cave-soil-atmosphere system validated with laboratory experimentation. CO2 and 222 Rn dynamics in the cavity demonstrate the dependence on the climatic parameters, mainly on the differences between outdoor and indoor temperatures. Within the cave, the annual cycles are characterized by two outstanding moments: cave gaseous recharge and ventilation when cave acts as gaseous sink or source respectively. Relationship with soil above the cave exists permanently. Soil temperature and moisture are responsible for CO2 production at different time scales.Soil CO2 in Rull site reaches values higher than 3000 ppm in April-May, which falls to nearly 1000 ppm during the summer time. Due to CO 2 diffusion, maximum values in the cave are reached in the warmest months and are in accordance to soil CO2 values. Within the cave, maximum CO2 concentration is, in average, 3470 ppm while minimum is 623 ppm. Cave temperature and relative humidity remain quite stable with mean values of 16.1 ºC and 97.9% respectively. To describe field findings, CO2 production and diffusion experiments are developed related to soil behaviour. Results show that soil CO2 production increases as soil temperature and moisture increase according to a calculated logarithmic equation until water content in soil exceeds the saturation values. In addition, CO2 diffusion in Rull soil is reduced around 60% when water content in soil increases from 0 to 30%. Soil-produced CO2 reaches Rull cave, by diffusion. We estimate 57 kg of emitted CO2 from the cave to the atmosphere in an annual cycle, considering a volume of 9915 m 3 . Finally, projections of future climate in the study site confirm a general tendency for annual-mean conditions to be warmer and drier, which will directly affect soil CO2 production. Under this situation, Rull cave will experience changes in the stored and then exchanged annual amount of CO2.

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“…At the same time, increasing temperature can also activate root respiration by influencing the photosynthesis of the plant and photosynthates translocated from the aboveground part of the plant (as explained below). Furthermore, increasing soil temperature advances gas transmission in soil and therefore accelerates gas exchange with the atmosphere (Tang et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Soil temperature and biotic factors drive the seasonal variation of soil respiration in a maize (Zea mays L.) agricultural ecosystem

Han

Zhou

et al. 2006

Plant Soil

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The diurnal and seasonal variation of soil respiration (SR) and their driving environmental factors were studied in a maize ecosystem during the growing season 2005. The diurnal variation of SR showed asymmetric patterns, with the minimum occurring around early morning and the maximum around 13:00 h. SR fluctuated greatly during the growing season. The mean SR rate was 3.16 lmol CO 2 m -2 s -1 , with a maximum of 4.87 lmol CO 2 m -2 s -1 on July 28 and a minimum of 1.32 lmol CO 2 m -2 s -1 on May 4. During the diurnal variation of SR, there was a significant exponential relationship between SR and soil temperature (T) at 10 cm depth: SR ¼ ae bT . At a seasonal scale, the coefficient a and b fluctuated because the biomass (B) increased a, and the net primary productivity (NPP) of maize markedly increased b of the exponential equation. Based on this, we developed the equationto estimate the magnitude of SR and to simulate its temporal variation during the growth season of maize. Most of the temporal variability (93%) in SR could be explained by the variations in soil temperature, biomass and NPP of maize. This model clearly demonstrated that soil temperature, biomass and NPP of maize combined to drive the seasonal variation of SR during the growing season. However, only taking into account the influence of soil temperature on SR, an exponential equation over-or underestimated the magnitude of SR and resulted in an erroneous representation of the seasonal variation in SR. Our results highlighted the importance of biotic factors for the estimation of SR during the growing season. It is suggested that the models of SR on agricultural sites should not only take into account the influence of soil temperature, but also incorporate biotic factors as they affect SR during the growing season.

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Assessing soil CO2 efflux using continuous measurements of CO2 profiles in soils with small solid-state sensors

Cited by 293 publications

References 39 publications

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Soil temperature and biotic factors drive the seasonal variation of soil respiration in a maize (Zea mays L.) agricultural ecosystem

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