Impact of site-preparation on soil-surface CO&lt;sub&gt;2&lt;/sub&gt; fluxes and litter decomposition in a clear-cut in Sweden

Mjöfors, Kristina; Strömgren, Monika; Nohrstedt, Hans‐Örjan; Gärdenäs, Annemieke I.

doi:10.14214/sf.1403

Cited by 22 publications

(24 citation statements)

References 54 publications

(71 reference statements)

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“…This top layer seemed to have similar C mineralization rates as the underlying humus layer ( Figure 5). In a study conducted 1-2 years after stump harvesting, Mjöfors et al (2015) observed higher CO2 fluxes from the plots with double humus layer than from the control plots with an undisturbed humus layer. However, during the second year, the soil CO2 fluxes from the plots with a double humus layer decreased and equaled those from control plots (Mjöfors et al, 2015).…”

Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 94%

“…In a study conducted 1-2 years after stump harvesting, Mjöfors et al (2015) observed higher CO2 fluxes from the plots with double humus layer than from the control plots with an undisturbed humus layer. However, during the second year, the soil CO2 fluxes from the plots with a double humus layer decreased and equaled those from control plots (Mjöfors et al, 2015). Thus, Mjöfors et al (2015) concluded that although mixing favors decomposition it does not necessarily lead to higher CO2emissions from the whole profile, but rather creates SOM cohorts in various soil depths, which then decompose at different rates.…”

Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 94%

“…However, during the second year, the soil CO2 fluxes from the plots with a double humus layer decreased and equaled those from control plots (Mjöfors et al, 2015). Thus, Mjöfors et al (2015) concluded that although mixing favors decomposition it does not necessarily lead to higher CO2emissions from the whole profile, but rather creates SOM cohorts in various soil depths, which then decompose at different rates.…”

Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 96%

See 2 more Smart Citations

Soil changes and long-term ecosystem recovery from physical and chemical load – stump harvesting and sprinkling infiltration as case studies

Kaarakka¹

2018

Diss. For.

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Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 94%

Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 94%

Section: How Stump Harvesting Affects Soil C and N Mineralization Ratmentioning

confidence: 96%

See 1 more Smart Citation

Soil changes and long-term ecosystem recovery from physical and chemical load – stump harvesting and sprinkling infiltration as case studies

Kaarakka¹

2018

Diss. For.

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“…To our knowledge, field 388 studies on CO2 fluxes in 11-12 year-old stands after stump harvesting are lacking, but studies 389 on 1-2 year-old clear-cuts show that CO2 fluxes from mounds, despite the addition of a top 390 layer, can be lower than those from undisturbed soil . In 391 another study, Mjöfors et al (2015) noted that CO2 fluxes from plots with double humus 392 layer (DHL) were initially higher than from control plots with an undisturbed humus layer. 393…”

mentioning

confidence: 99%

“…A possible reason for the occasionally very low fluxes from DHL 395 plots is that high moisture levels in layers containing much of the OM may have suppressed 396 decomposition and/or gas fluxes (Mjöfors et al, 2015). 397 398…”

mentioning

confidence: 99%

Carbon and nitrogen pools and mineralization rates in boreal forest soil after stump harvesting

Kaarakka

Hyvönen

Strömgren

et al. 2016

Forest Ecology and Management

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25The use of forest-derived biomass has steadily increased in Finland and Sweden during the 26 past decades leading to more intensive forest management practices in the region, such as 27 whole-tree harvesting, both above-and belowground. Stump harvesting results in a direct 28 removal of stump and coarse-root carbon (C) from the stand and can cause extensive soil 29 disturbance, which in turn can result in increased C mineralization. In this study, the effects 30 of stump harvesting on soil C and nitrogen (N) mineralization, and soil surface disturbance 31 were studied in two different clear-felled Norway spruce (Picea abies) sites in Central 32Finland. The treatments were whole-tree harvesting (WTH, removal of stems and logging 33 residues), and WTH and stump harvesting (WTH+S). Both sites, Honkola (2 stands) and 34Haukilahti (6 stands) were mounded. In both treatments, soil samples were taken from 35 different soil layers down to a total depth of 20 cm from (i) mounds, (ii) undisturbed soil and 36 (iii) pits. The sampling was performed 11-12 years after treatments. Soil C and N 37 mineralization rates were determined in laboratory incubation experiments. In addition, total 38 C and N pools (g m -2 ) were estimated for each disturbance class and soil layer. Soil C and N 39 pools tended to be lower following stump harvesting, but no statistically significant treatment 40 effect was detected. Stump harvesting increased soil mixing as indicated by a significant 41 decrease in C concentration in the mound disturbance class. There was no significant effect 42 of stump harvesting on soil C mineralization rates. A combination of mineralization rates and 43 soil pool data showed that field C mineralization (g CO2-C m -2 yr -1 ) did not significantly 44 differ between stands where stumps were removed or were retained. Further, stump 45 harvesting did not seem to have any stimulating effect on soil CO2 efflux 11-12 years after 46 treatment. 47 48 49 3

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Stump harvesting for bioenergy: A review of climatic and environmental impacts in northern Europe and America

Persson

Egnell²

2018

WIREs Energy & Environment

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Stump harvesting is defined as an intensification of forest management in comparison with stem-only harvesting and removal of tops and branches. It increases soil mixing and the proportion of bare soil. In contrast to earlier hypotheses, stump harvesting was found to reduce emissions of carbon dioxide (CO 2 ), nitrous oxide, and methane in the short term. In the long term, heterotrophic soil CO 2 evolution is reduced. Both model and empirical studies indicate that stump removal can reduce the soil organic carbon (SOC) pool in the short term, but long-term experiments (32-39 years) could not verify any SOC decline. Life cycle assessment studies showed that stumps as fuel resulted in markedly lower emissions of CO 2 into the atmosphere, viewed over a whole forest rotation compared to heating by natural gas and coal. Stump removal does not seem to affect timber production in the next forest rotation and often reduces the infection rate of root rot. It increases the natural regeneration of birch and pine, it can increase nitrate leaching at N-rich sites, and it can increase the number of water-filled cavities where methylmercury is formed. Stump extraction decreases the amount of dwarf shrubs in young clearcuts, but after 1-2 decades, these species are generally recovered. Many species dependent on dead wood are adversely affected by intense stump harvest. Model studies suggest that the risk of species extinction is small when only 10% of the total clear-cut area in the forest landscape is stump harvested, but the risk of extinction rises at increasing extraction intensities.

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Impact of site-preparation on soil-surface CO<sub>2</sub> fluxes and litter decomposition in a clear-cut in Sweden

Cited by 22 publications

References 54 publications

Soil changes and long-term ecosystem recovery from physical and chemical load – stump harvesting and sprinkling infiltration as case studies

Soil changes and long-term ecosystem recovery from physical and chemical load – stump harvesting and sprinkling infiltration as case studies

Carbon and nitrogen pools and mineralization rates in boreal forest soil after stump harvesting

Stump harvesting for bioenergy: A review of climatic and environmental impacts in northern Europe and America

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