Carbon dynamics in forest fire affected permafrost soils

Aaltonen, Heidi

doi:10.14214/df.288

Cited by 1 publication

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References 154 publications

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“…A strong negative correlation between stand age and LitD and an important significant positive correlation between ST5 and BR was found (Table 5). Aaltonen (2020) [56] concluded that even if permafrost thaw was apparent after fire, the soil organic matter (SOM) stored in the permafrost would not be especially labile or temperature-sensitive. This supports the conclusion by Anisimov et al (2012) [44] that permafrost in the Tura area is moderately sensitive to changes in temperature, and it is in accordance with our calculations of Kα (Figure A4).…”

Section: Sr Associated Factors and Their Correlationsmentioning

confidence: 99%

Age-Dependent Changes in Soil Respiration and Associated Parameters in Siberian Permafrost Larch Stands Affected by Wildfire

Masyagina

Евграфова

Menyailo

et al. 2021

Forests

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The observed high spatial variation in soil respiration (SR) and associated parameters emphasized the importance of SR heterogeneity at high latitudes and the involvement of many factors in its regulation, especially within fire-affected areas. The problem of estimating CO2 emissions during post-fire recovery in high-latitude ecosystems addresses the mutual influence of wildfires and climate change on the C cycle. Despite its importance, especially in permafrost regions because of their vulnerability, the mutual influence of these factors on CO2 dynamics has rarely been studied. Thus, we aimed to understand the dynamics of soil respiration (SR) in wildfire-affected larch recovery successions. We analyzed 16-year data (1995–2010) on SR and associated soil, biological, and environmental parameters obtained during several field studies in larch stands of different ages (0–276 years) in the Krasnoyarsk region (Russia). We observed a high variation in SR and related parameters among the study sites. SR varied from 1.77 ± 1.18 (mean ± SD) µmol CO2 m−2 s−1 in the 0–10-year-old group to 5.18 ± 2.70 µmol CO2 m−2 s−1 in the 150–276-year-old group. We found a significant increasing trend in SR in the 88–141-year old group during the study period, which was related to the significant decrease in soil water content due to the shortage of precipitation during the growing season. We observed a high spatial variation in SR, which was primarily regulated by biological and environmental factors. Different parameters were the main contributors to SR in each group, an SR was significantly affected by the inter-relationships between the studied parameters. The obtained results can be incorporated into the existing SR databases, which can allow their use in the construction and validation of C transport models as well as in monitoring global fluctuations in the C cycle in response to climate change.

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Section: Sr Associated Factors and Their Correlationsmentioning

confidence: 99%