Spatial variability of soil respiration in a small agricultural watershed — Are patterns of soil redistribution important?

Fiener, Peter; Dlugoß, Verena; Korres, Wolfgang; Schneider, Karl

doi:10.1016/j.catena.2011.05.014

Cited by 37 publications

(15 citation statements)

References 45 publications

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“…This creates interferences when measuring heterotrophic CO 2 fluxes as an indicator of OC turnover (e.g. Davidson et al, 1998;Epron et al, 2006;Fiener et al, 2012).…”

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

confidence: 99%

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

2015

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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.

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“…This creates interferences when measuring heterotrophic CO 2 fluxes as an indicator of OC turnover (e.g. Davidson et al, 1998;Epron et al, 2006;Fiener et al, 2012).…”

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

confidence: 99%

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

2015

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“…In contrast to these results, Bajracharya et al [32] and Parkin et al [27] did not find any significant differences in soil respiration measured at different slope positions in the field. Despite these inconsistent results, soil redistribution was found to have a great effect on the spatial variability of soil respiration [26]. Tillage and application of straw as mulch can affect soil redistribution, changes in soil properties, and soil temperature and moisture [7,10,19,24], which affect the spatial variability of soil respiration.…”

Section: Introductionmentioning

confidence: 97%

“…Soil microbial respiration is reported to be variable in space, especially in sloping land possibly due to differences in soil chemical and biological properties, plant types and community, soil moisture, and soil redistribution [12,[26][27][28]. Most studies have reported that soil temperature and moisture affect soil microbial respiration as first-order and second-order, respectively, meaning that each degree rise in soil temperature influences soil microbial respiration [12,26].…”

Section: Introductionmentioning

confidence: 99%

“…Most studies have reported that soil temperature and moisture affect soil microbial respiration as first-order and second-order, respectively, meaning that each degree rise in soil temperature influences soil microbial respiration [12,26]. Soil erosion, transportation, and deposition by water and tillage drastically affect the distribution of soil organic C, which then influences the exchange of carbon between the pedosphere and the atmosphere [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of No-Till Farming and Straw Mulch on Spatial Variability of Soil Respiration in Sloping Cropland

Li¹,

Hou²,

Wang³

et al. 2016

Pol. J. Environ. Stud.

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The two major techniques of conservation agriculture -no-till and straw mulch -are widely used in agricultural activities. Many studies have investigated the response of soil respiration to conservation agriculture. However, there are few studies estimating soil CO 2 emissions in sloping cropland. For this research we selected typical sloping cropland in China's semiarid Loess Plateau region. The spatial heterogeneity of soil respiration under different tillage and straw mulch was investigated using an LI-8100A soil carbon flux measuring system from October 2013 to September 2014. Soil respiration showed a strong seasonal pattern under all treatments, with the highest values in July ). No-till increased soil respiration by increasing soil temperature and soil moisture, while straw mulch decreased soil moisture and had the tendency to increase annual total carbon emissions, and straw incorporation had the highest annual total soil carbon emissions (992 g C m -2 ). The slope stage had a visible effect on soil respiration, and soil respiration rates increased in the following order: lower > middle > upper positions under different treatments. The relationship between soil respiration and soil moisture was linear under all treatments; the exponential model was more suitable for simulating the relationship between soil respiration and soil temperature. Temperature sensitivity (Q 10 ) values under different treatments ranged from 1.94 to 2.63, and the difference among tillage and straw mulch treatments as a whole was not significant. However, the Q 10 values had a tendency to decrease from summit to foot in tillage treatments, and no-tillage would reduce spatial variability of Q 10 values.

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“…A change in soil moisture has a greater impact when the temperatures are high, while a change in temperatures has a greater impact when the soil is humid (Howard and Howard, 1979;Joffre et al, 2003). Many previous studies (Fiener et al, 2011;Hashimoto et al, 2009;Niinistö et al, 2011;Shi et al, 2006) have based CO 2 efflux estimation purely on soil temperature (using e.g. Arrhenius law) because soil moisture is found not to be a limiting factor in most of the studied regions.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal variability of soil respiration in a spruce-dominated headwater catchment in western Germany

Bossa

Diekkrüger

2014

Biogeosciences

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Abstract. CO 2 production and transport from forest floors is an important component of the carbon cycle and is closely related to the global atmosphere CO 2 concentration. If we are to understand the feedback between soil processes and atmospheric CO 2 , we need to know more about the spatiotemporal variability of this soil respiration under different environmental conditions. In this study, long-term measurements were conducted in a spruce-dominated forest ecosystem in western Germany. Multivariate analysis-based similarities between different measurement sites led to the detection of site clusters along two CO 2 emission axes: (1) mainly controlled by soil temperature and moisture condition, and (2) mainly controlled by root biomass and the forest floor litter. The combined effects of soil temperature and soil moisture were used as a time-dependent rating factor affecting the optimal CO 2 production and transport at cluster level. High/moderate/weak time-dependent rating factors were associated with the different clusters. The process-based, most distant clusters were identified using specified pattern characteristics: the reaction rates in the soil layers, the activation energy for bio-chemical reactions, the soil moisture dependency parameter, the root biomass factor, the litter layer factor and the organic matter factor. A HYDRUS-1D model system was inversely used to compute soil hydraulic parameters from soil moisture measurements. Heat transport parameters were calibrated based on observed soil temperatures. The results were used to adjust CO 2 productions by soil microorganisms and plant roots under optimal conditions for each cluster. Although the uncertainty associated with the HYDRUS-1D simulations is higher, the results were consistent with both the multivariate clustering and the timedependent rating of site production.Finally, four clusters with significantly different environmental conditions (i.e. permanent high soil moisture condition, accumulated litter amount, high variability in soil moisture content, and dominant temperature dependence) were found to be relevant in explaining the spatio-temporal variability of CO 2 efflux and providing reference-specific characteristic values for the investigated area.

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Spatial variability of soil respiration in a small agricultural watershed — Are patterns of soil redistribution important?

Cited by 37 publications

References 45 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

Effect of No-Till Farming and Straw Mulch on Spatial Variability of Soil Respiration in Sloping Cropland

Spatio-temporal variability of soil respiration in a spruce-dominated headwater catchment in western Germany

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