Relationships between co2 evolution, moisture content and temperature for a range of soil types

Howard, D. M.; Howard, P. J. A.

doi:10.1016/0038-0717(93)90008-y

Cited by 396 publications

(254 citation statements)

References 15 publications

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“…[99] Previous studies have suggested that there is an optimal soil moisture content for C and N mineralization [Lin and Doran, 1984;Skopp et al, 1990;Howard and Howard, 1993]. If soil moisture is below the optimum, soil microbial activities are restricted and increase monotonically with soil moisture content.…”

Section: A212 Impact Of Soil Moisture Content On Decompositionmentioning

confidence: 99%

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Liu

Bliss

Sundquist

et al. 2003

Global Biogeochemical Cycles

224

221

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[1] Soil erosion and deposition may play important roles in balancing the global atmospheric carbon budget through their impacts on the net exchange of carbon between terrestrial ecosystems and the atmosphere. Few models and studies have been designed to assess these impacts. In this study, we developed a general ecosystem model, ErosionDeposition-Carbon-Model (EDCM), to dynamically simulate the influences of rainfallinduced soil erosion and deposition on soil organic carbon (SOC) dynamics in soil profiles. EDCM was applied to several landscape positions in the Nelson Farm watershed in Mississippi, including ridge top (without erosion or deposition), eroding hillslopes, and depositional sites that had been converted from native forests to croplands in 1870. Erosion reduced the SOC storage at the eroding sites and deposition increased the SOC storage at the depositional areas compared with the site without erosion or deposition. Results indicated that soils were consistently carbon sources to the atmosphere at all landscape positions from 1870 to 1950, with lowest source strength at the eroding sites (13 to 24 gC m À2 yr À1 ), intermediate at the ridge top (34 gC m À2 yr À1 ), and highest at the depositional sites (42 to 49 gC m À2 yr À1 ). During this period, erosion reduced carbon emissions via dynamically replacing surface soil with subsurface soil that had lower SOC contents (quantity change) and higher passive SOC fractions (quality change). Soils at all landscape positions became carbon sinks from 1950 to 1997 due to changes in management practices (e.g., intensification of fertilization and crop genetic improvement). The sink strengths were highest at the eroding sites (42 to 44 gC m À2 yr À1 ), intermediate at the ridge top (35 gC m À2 yr À1 ), and lowest at the depositional sites (26 to 29 gC m À2 yr À1 ). During this period, erosion enhanced carbon uptake at the eroding sites by continuously taking away a fraction of SOC that can be replenished with enhanced plant residue input. Overall, soil erosion and deposition reduced CO 2 emissions from the soil into the atmosphere by exposing low carbon-bearing soil at eroding sites and by burying SOC at depositional sites. The results suggest that failing to account for the impact of soil erosion and deposition may potentially contribute to an overestimation of both the total historical carbon released from soils owing to land use change and the contemporary carbon sequestration rates at the eroding sites.

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Section: A212 Impact Of Soil Moisture Content On Decompositionmentioning

confidence: 99%

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Liu

Bliss

Sundquist

et al. 2003

Global Biogeochemical Cycles

224

221

View full text Add to dashboard Cite

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“…However, estimates of soil carbon are highly uncertain (Nakayama 1990;Janssens et al 2000) and difficult to measure because of differences between ecosystems and external drivers such as temperature (Lloyd and Taylor 1994;Davidson et al 1998;Janssens et al 2003), soil moisture (Howard and Howard, 1993), soil texture and chemical properties (Trumbore et al 1995;Liski and Westma 1997), wind speed, leaf litter and root biomass (Reichstein et al 2003;Trumbore 2006) and activity of macro and microfauna (Dantec et al 1999;Giardina and Ryan 2000;Raich et al 2002). Several studies also suggest an influence of seasonal variation in litterfall on soil respiration rates (Reichstein et al 2003;Salimon et al 2004;Valentini et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Soil CO2 efflux in central Amazonia: environmental and methodological effects

et al. 2012

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Soil respiration plays a significant role in the carbon cycle of Amazonian rainforests. Measurements of soil respiration have only been carried out in few places in the Amazon. This study investigated the effects of the method of ring insertion in the soil as well as of rainfall and spatial distribution on CO 2 emission in the central Amazon region. The ring insertion effect increased the soil emission about 13-20% for sandy and loamy soils during the firsts 4-7 hours, respectively. After rainfall events below 2 mm, the soil respiration did not change, but for rainfall greater than 3 mm, after 2 hours there was a decrease in soil temperature and respiration of about 10-34% for the loamy and sand soils, with emissions returning to normal after around 15-18 hours. The size of the measurement areas and the spatial distribution of soil respiration were better estimated using the Shuttle Radar Topographic Mission (SRTM) data. The Campina reserve is a mosaic of bare soil, stunted heath forest-SHF and tall heath forest-THF. The estimated total average CO 2 emissions from the area was 3.08±0.8 µmol CO 2 m -2 s -1. The Cuieiras reserve is another mosaic of plateau, slope, Campinarana and riparian forests and the total average emission from the area was 3.82±0.76 µmol CO 2 m -2 s -1. We also found that the main control factor of the soil respiration was soil temperature, with 90% explained by regression analysis. Automated soil respiration datasets are a good tool to improve the technique and increase the reliability of measurements to allow a better understanding of all possible factors driven by soil respiration processes. Keywords: Soil respiration, rainfall, soil temperature. Efluxo de CO 2 do solo na Amazônia central: efeitos ambiental e metodológico resumoRespiração do solo possui um importante papel no ciclo do carbono em florestas tropicais Amazônicas. Entretanto poucas medidas de respiração do solo foram feitas. Neste estudo são apontados os efeitos na metodologia de instalação dos anéis no solo, bem como os efeitos da precipitação e a distribuição espacial da emissão de CO 2 na Amazônia central. Os efeitos da inserção de anéis no solo aumentaram de 13 a 20% para o solo arenoso e argiloso, o efeito durou de 4 a 7 horas, respectivamente. Já os efeitos na precipitação, notamos que os eventos abaixo de 2 mm a respiração do solo permaneceu indiferente, mas para precipitação acima de 3 mm, 2 horas depois, houve uma diminuição da temperatura e respiração em 10 a 34% para o solo argilosos e arenosos, retornando a emissão normal após 15 a 18 horas. Para estimar a distribuição espacial da respiração do solo e o tamanho correto das áreas medidas, foram utilizadas as imagens do Shuttle Radar Topographic Mission (SRTM). Considerando que a Reserva de Campina é um mosaico de solo desnudo, floresta alagável de baixa e alta estatura (SHF e THF). A emissão total média de CO 2 para a área foi de 3.08±0.8 µmol CO 2 m -2 s -1 . Já a Reserva do Cuieiras possui outro mosaico de florestas de platôs, encostas, campinaranas e rip...

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“…Both are controlled by various biotic and abiotic factors such as soil temperature [11,19], soil moisture [8,10], litter quantity and quality [18], root activity [4] and several others [18]. The impact of these biotic and abiotic factors on soil CO 2 efflux rates is often unclear, mainly because of the multiple interactions between the controlling factors and because of the complexity of soil carbon processes.…”

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confidence: 99%

Soil CO₂ efflux rates in different tropical vegetation types in French Guiana

Janssens

Barigah²,

Ceulemans

1998

Ann. For. Sci.

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-Soil CO 2 efflux rates were measured from July to September 1994 in three vegetation types (primary forest, hardwood plantation and clear-cut) near Sinnamary, French Guiana (5° 15' N, 52°55' W), using a portable closed-chamber infrared gas analysis system. Mean soil CO 2 efflux rates were: 2.3 μmol m -2 s -1 in the primary forest versus 2.5 μmol m -2 s -1 in the clear-cut and 2.9 μmol m -2 s -1 in the plantation. Diurnal patterns of soil CO 2 efflux in the primary forest and hardwood plantation did not show significant (P ≤ 0.05) changes. No correlation between soil CO 2 efflux rate and soil temperature was detected in these two vegetation types. In the clearcut, a very pronounced peak in soil CO 2 efflux rate occurred, which was strongly correlated with soil temperature. In all three sites, the range of average soil CO 2 efflux rates among collars (spatial differences) largely exceeded the range observed among daily means (temporal variation

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Relationships between co2 evolution, moisture content and temperature for a range of soil types

Cited by 396 publications

References 15 publications

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Soil CO2 efflux in central Amazonia: environmental and methodological effects

Soil CO₂ efflux rates in different tropical vegetation types in French Guiana

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Relationships between co2 evolution, moisture content and temperature for a range of soil types

Cited by 396 publications

References 15 publications

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Modeling carbon dynamics in vegetation and soil under the impact of soil erosion and deposition

Soil CO2 efflux in central Amazonia: environmental and methodological effects

Soil CO2 efflux rates in different tropical vegetation types in French Guiana

Contact Info

Product

Resources

About

Soil CO₂ efflux rates in different tropical vegetation types in French Guiana