Interactive effect of soil moisture and temperature regimes on the dynamics of soil organic carbon decomposition in a subarctic tundra soil

Ro, Hee‐Myong; Ji, Yoonmi; Lee, Bang-Yong

doi:10.1007/s12303-017-0052-2

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…Consistent with the patterns observed at a biome scale, our results suggest that landforms with dense vascular vegetation had the highest GEP accompanied by high WUE. The environmental variables that explained this variation among landforms included soil moisture conditions and temperature, which are directly impacted by current climate warming in the subarctic environment 59,60 . We observed an increase in VWC in the channel fen sites, as air temperature increased gradually from snowmelt to the middle of the peak growth in mid‐July.…”

Section: Discussionmentioning

confidence: 79%

“…As the active layer thaws, the roots may be able to tap into the subsurface ice melting and in the pres- climate warming in the subarctic environment. 59,60 We observed an increase in VWC in the channel fen sites, as air temperature increased gradually from snowmelt to the middle of the peak growth in mid-July. This coincided with increased productivity of the dominant sedge vegetation cover, with lower respiration rate sustained by the stable shallow water table depth.…”

Section: Feedbacks Of Hydrometeorological Variables On Etmentioning

confidence: 76%

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Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

Nwaishi

Morison

Huizen

et al. 2020

Permafrost & Periglacial

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Warming conditions across Canada's subarctic and arctic regions are causing permafrost landforms to thaw, resulting in rapid land cover change, including conversion of peat plateaus to wetland and thermokarst. These changes have important implications for northern ecosystems, including shifting controls on carbon uptake and release functions, as well as altering evapotranspiration (ET) rates, which form feedbacks with climatic change. Four landforms (peat plateau, sedge lawn, channel fen, and a thermokarst shoreline collapse scar) in the Hudson Bay Lowlands, northern Manitoba, were instrumented for weekly chamber measurements of carbon dioxide (CO 2) and water vapor flux over a summer season (May to September 2014). Relative to other landforms, thermokarst CO 2 exchange was characterized by high respiration rates early in the season, which decreased and were offset later in the season by CO 2 uptake driven by sedge productivity. For all landforms, ET peaked postsnowmelt during rapid active layer thaw, and decreased throughout the growing season, controlled primarily by atmospheric vapor deficits. This work shows distinct differences in CO 2 exchange and ET between intact and thawing permafrost features. While representative of small-scale processes in a single study region over one growing season, the results presented in this study have important implications for our understanding of ecohydrological and biogeochemical functioning of subarctic landscapes under future climates.

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Section: Discussionmentioning

confidence: 79%

Section: Feedbacks Of Hydrometeorological Variables On Etmentioning

confidence: 76%

Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

Nwaishi

Morison

Huizen

et al. 2020

Permafrost & Periglacial

View full text Add to dashboard Cite

show abstract

“…4 ). In terms of indirect effects, decomposition of soil organic matter depends on factors such as soil mineralogy, redox potential and electron acceptor availability, which are controlled by soil water regimes ( Ro, Ji & Lee, 2018 ). Studies have found that an increase in soil water content benefits dissolved organic carbon dissolution and nutrients transfer, which stimulates the activity of microorganisms involved in organic carbon decomposition ( Goebel et al, 2007 ).…”

Section: Discussionmentioning

confidence: 99%

The stability of soil organic carbon across topographies in a tropical rainforest

Jiang

Yang

et al. 2021

PeerJ

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Mechanisms of soil organic carbon (SOC) stability are still unclear in forest ecosystems. In order to unveil the influences of topography on the SOC stability, a 60ha dynamic plot of a tropical montane rainforest was selected in Jianfengling, in Hainan Island, China and soil was sampled from 60 quadrats. The chemical fractions of the SOC were detected with 13C CPMAS/NMR and path analyses explore the mechanisms of SOC stability in different topographies. The chemical fractions of the SOC comprised alkyl carbon > O-alkyl carbon > carboxyl carbon > aromatic carbon. The decomposition index (DI) values were greater than 1 in the different topographies, with an average DI value was 1.29, which indicated that the SOC in the study area was stable. Flat and top areas (together named RF) had more favorable nutrients and silt contents compared with steep and slight steep areas (together named RS). The influencing factors of SOC stability varied across the topographies, where SOC, soil moisture (SM) and ammoniacal nitrogen (NH4+-N, AN) were the main influencing factors in the RF, while SM and AN were the main factors in the RS. Greater SOC and AN strengthened the SOC stability, while higher soil moisture lowered SOC stability. The inertia index was higher in the RS than the RF areas, indicating that local topography significantly affects SOC content and SOC stability by changing soil environmental factors. Topography cannot be neglected in considering SOC stability and future C budgets.

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The effect of differences in soil water content on microbial and enzymatic properties across the soil profiles

Długosz

Piotrowska-Długosz

Breza-Boruta

2024

Ecohydrology & Hydrobiology

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Interactive effect of soil moisture and temperature regimes on the dynamics of soil organic carbon decomposition in a subarctic tundra soil

Cited by 4 publications

References 47 publications

Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

The stability of soil organic carbon across topographies in a tropical rainforest

The effect of differences in soil water content on microbial and enzymatic properties across the soil profiles

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Interactive effect of soil moisture and temperature regimes on the dynamics of soil organic carbon decomposition in a subarctic tundra soil

Cited by 4 publications

References 47 publications

Growing season CO2 exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

Growing season CO2 exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

The stability of soil organic carbon across topographies in a tropical rainforest

The effect of differences in soil water content on microbial and enzymatic properties across the soil profiles

Contact Info

Product

Resources

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Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands

Growing season CO₂ exchange and evapotranspiration dynamics among thawing and intact permafrost landforms in the Western Hudson Bay lowlands