Soil CO2 efflux vs. soil respiration: Implications for flux models

Maier, Martin; Schack‐Kirchner, Helmer; Hildebrand, Ernst E.; Schindler, Dirk

doi:10.1016/j.agrformet.2011.07.006

Cited by 94 publications

(79 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is in agreement with recent studies (e.g. Maier et al, 2011;Schmidt et al, 2011;Ball, 2013; also illustrated by Tran et al, 2015) that show that soil physical properties are key to understanding the mechanisms regulating the soil gases emissions. Our study brings new insights by demonstrating the strong linkages between soil physical properties and CO 2 emissions based on in situ and depth-explicit observations.…”

Section: Biogeosciencessupporting

confidence: 81%

“…This CO 2 then accumulates under the soil diffusion barriers. This accumulated CO 2 is then later emitted when VWC decreases under a threshold value which allows a significant gas diffusion, as suggested by Maier et al (2011) and Ball (2013). The main implication of these observations is that if hydrologic regimes change and that footslope soils become drier (reaching moisture conditions favorable for micro-organisms respiration and gas transfer), there is a large amount of potentially easily decomposable OC stored at depth that can suddenly decompose and be emitted to the atmosphere.…”

Section: Biogeosciencesmentioning

confidence: 84%

“…gas diffusion barriers) may also exert an important control on soil microbial activity and soil CO 2 fluxes (e.g. Wiaux et al, 2014b;Ball, 2013;Maier et al, 2011). Furthermore, there is empirical evidence suggesting that physical protection (i.e.…”

Section: F Wiaux Et Al: Vertical Partitioning and Controlling Factomentioning

confidence: 99%

“…during periods with a very low diffusivity) of the CO 2 produced by the mineralization of this large labile OC stock. Maier et al (2011) showed that the CO 2 efflux (observed CO 2 flux resulting from all transfer and production mechanisms together) can deviate in time from the instantaneous soil respiration (due to micro-organisms metabolic activity) because of the CO 2 storage into soil pore spaces. Hence, our data suggest that at the footslope, soil physical properties are the dominant control on surface CO 2 fluxes.…”

Section: Biogeosciencesmentioning

confidence: 99%

See 3 more Smart Citations

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

2015

View full text Add to dashboard Cite

Abstract. In this study we aim to elucidate the role of physical conditions and gas transfer mechanism along soil profiles in the decomposition and storage of soil organic carbon (OC) in subsoil layers. We use a qualitative approach showing the temporal evolution and the vertical profile description of CO 2 fluxes and abiotic variables. We assessed soil CO 2 fluxes throughout two contrasted soil profiles (i.e. summit and footslope positions) along a hillslope in the central loess belt of Belgium. We measured the time series of soil temperature, soil moisture and CO 2 concentration at different depths in the soil profiles for two periods of 6 months. We then calculated the CO 2 flux at different depths using Fick's diffusion law and horizon specific diffusivity coefficients. The calculated fluxes allowed assessing the contribution of different soil layers to surface CO 2 fluxes. We constrained the soil gas diffusivity coefficients using direct observations of soil surface CO 2 fluxes from chamber-based measurements and obtained a good prediction power of soil surface CO 2 fluxes with an R 2 of 92 %.We observed that the temporal evolution of soil CO 2 emissions at the summit position is mainly controlled by temperature. In contrast, at the footslope, we found that long periods of CO 2 accumulation in the subsoil alternates with short peaks of important CO 2 release. This was related to the high water filled pore space that limits the transfer of CO 2 along the soil profile at this slope position. Furthermore, the results show that approximately 90 to 95 % of the surface CO 2 fluxes originate from the first 10 cm of the soil profile at the footslope. This indicates that soil OC in this depositional context can be stabilized at depth, i.e. below 10 cm. This study highlights the need to consider soil physical properties and their dynamics when assessing and modeling soil CO 2 emissions. Finally, changes in the physical environment of depositional soils (e.g. longer dry periods) may affect the long-term stability of the large stock of easily decomposable OC that is currently stored in these environments.

show abstract

Section: Biogeosciencessupporting

confidence: 81%

Section: Biogeosciencesmentioning

confidence: 84%

Section: F Wiaux Et Al: Vertical Partitioning and Controlling Factomentioning

confidence: 99%

Section: Biogeosciencesmentioning

confidence: 99%

See 2 more Smart Citations

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

2015

View full text Add to dashboard Cite

show abstract

“…Fang and Moncrieff, 1999). This finding is further supported by the measurement of Maier et al (2011), which showed that 40 % of the respired CO 2 could be stored temporally in the soil pore space after rainfall. The dissolved CO 2 was then released gradually with the evaporation of pore water, leading to lagged responses of efflux as compared to respiration.…”

Section: Modelled Plant-interspace Differences In C Flux Componentssupporting

confidence: 70%

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

et al. 2018

View full text Add to dashboard Cite

Abstract. We used process-based modelling to investigate the roles of carbon-flux (C-flux) components and plantinterspace heterogeneities in regulating soil CO 2 exchanges (F S ) in a dryland ecosystem with sparse vegetation. To simulate the diurnal and seasonal dynamics of F S , the modelling considered simultaneously the CO 2 production, transport and surface exchanges (e.g. biocrust photosynthesis, respiration and photodegradation). The model was parameterized and validated with multivariate data measured during the years 2013-2014 in a semiarid shrubland ecosystem in Yanchi, northwestern China. The model simulation showed that soil rewetting could enhance CO 2 dissolution and delay the emission of CO 2 produced from rooting zone. In addition, an ineligible fraction of respired CO 2 might be removed from soil volumes under respiration chambers by lateral water flows and root uptakes. During rewetting, the lichen-crusted soil could shift temporally from net CO 2 source to sink due to the activated photosynthesis of biocrust but the restricted CO 2 emissions from subsoil. The presence of plant cover could decrease the root-zone CO 2 production and biocrust C sequestration but increase the temperature sensitivities of these fluxes. On the other hand, the sensitivities of root-zone emissions to water content were lower under canopy, which may be due to the advection of water flows from the interspace to canopy. To conclude, the complexity and plant-interspace heterogeneities of soil C processes should be carefully considered to extrapolate findings from chamber to ecosystem scales and to predict the ecosystem responses to climate change and extreme climatic events. Our model can serve as a useful tool to simulate the soil CO 2 efflux dynamics in dryland ecosystems.

show abstract

Periodic behavior of soil CO₂ emissions in diffuse degassing areas of the Azores archipelago: Application to seismovolcanic monitoring

et al. 2014

View full text Add to dashboard Cite

Time series of soil CO 2 efflux recorded in the Azores archipelago volcanic-hydrothermal areas feature daily and seasonal variations. The recorded CO 2 efflux values were lower during summer than in the winter season. The diurnal CO 2 efflux values were higher at dawn and lower in the early afternoon, contrary to that observed in biogenic environments. CO 2 efflux cycles correlated well with the environmental variables, such as air temperature, wind speed, and barometric pressure, which also showed low-and high-frequency periodicities. Several simulations were performed here using the Transport of Unsaturated Groundwater and Heat 2 (TOUGH2) geothermal simulator to complement the study of Rinaldi et al. (2012). The effects of the water table depth, air temperature perturbation amplitude, and soil thermal gradient contributed to an explanation of the contrasts observed in the diurnal (S 1 ) and semidiurnal (S 2 ) soil CO 2 efflux peaks for the different monitoring sites and seasons. Filtering techniques (multivariate regression analysis and fast Fourier transform filters) were also applied to the recorded time series to remove effects of external variables on the soil CO 2 efflux. The resulting time series (the residuals) correspond to the best approach to the deep-seated (volcanic/hydrothermal) CO 2 emissions and thus should be used in seismovolcanic monitoring programs. Even if no evident correlation can be established yet between the soil CO 2 residuals and seismicity over the monitored time, a seismic swarm that occurred around the end of 2008 might have triggered some deviations from the observed daily cycles.

show abstract

Soil CO2 efflux vs. soil respiration: Implications for flux models

Cited by 94 publications

References 25 publications

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Periodic behavior of soil CO₂ emissions in diffuse degassing areas of the Azores archipelago: Application to seismovolcanic monitoring

Contact Info

Product

Resources

About

Soil CO2 efflux vs. soil respiration: Implications for flux models

Cited by 94 publications

References 25 publications

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Modelling the diurnal and seasonal dynamics of soil CO&lt;sub&gt;2&lt;/sub&gt; exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Periodic behavior of soil CO2 emissions in diffuse degassing areas of the Azores archipelago: Application to seismovolcanic monitoring

Contact Info

Product

Resources

About

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Periodic behavior of soil CO₂ emissions in diffuse degassing areas of the Azores archipelago: Application to seismovolcanic monitoring