Factors causing temporal and spatial variation in heterotrophic and rhizospheric components of soil respiration in afforested organic soil croplands in Finland

Mäkiranta, Päivi; Minkkinen, Kari; Hytönen, Jyrki; Laine, Jukka

doi:10.1016/j.soilbio.2008.01.009

Cited by 75 publications

(74 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason behind the variation is likely the higher average soil temperature at station 3 since it could be shown by the regression analysis that measured heterotrophic soil efflux E CO 2 responded strongly to soil temperature, whereas the inclusion of water table depth only slightly increased the fit of the regression model. The low response to water table depth was also observed by Ojanen et al (2010) and Mäkiranta et al (2008) and is likely to be caused by the generally high drainage level of below 30 cm. Fresh litter with the highest potential for decomposition is deposited on the soil surface so that the water table would need to rise considerably to have an effect on the decomposition.…”

Section: Nee As Determined By Compartment Fluxesmentioning

confidence: 62%

A fertile peatland forest does not constitute a major greenhouse gas sink

et al. 2013

View full text Add to dashboard Cite

Abstract. Afforestation has been proposed as a strategy to mitigate the often high greenhouse gas (GHG) emissions from agricultural soils with high organic matter content. However, the carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) fluxes after afforestation can be considerable, depending predominantly on site drainage and nutrient availability. Studies on the full GHG budget of afforested organic soils are scarce and hampered by the uncertainties associated with methodology. In this study we determined the GHG budget of a spruce-dominated forest on a drained organic soil with an agricultural history. Two different approaches for determining the net ecosystem CO 2 exchange (NEE) were applied, for the year 2008, one direct (eddy covariance) and the other indirect (analyzing the different components of the GHG budget), so that uncertainties in each method could be evaluated. The annual tree production in 2008 was 8.3 ± 3.9 t C ha −1 yr −1 due to the high levels of soil nutrients, the favorable climatic conditions and the fact that the forest was probably in its phase of maximum C assimilation or shortly past it. The N 2 O fluxes were determined by the closed-chamber technique and amounted to 0.9 ± 0.8 t C eq ha −1 yr −1 . According to the direct measurements from the eddy covariance technique, the site acts as a minor GHG sink of −1.2 ± 0.8 t C eq ha −1 yr −1 . This contrasts with the NEE estimate derived from the indirect approach which suggests that the site is a net GHG emitter of 0.6 ± 4.5 t C eq ha −1 yr −1 . Irrespective of the approach applied, the soil CO 2 effluxes counter large amounts of the C sequestration by trees. Due to accumulated uncertainties involved in the indirect approach, the direct approach is considered the more reliable tool. As the rate of C sequestration will likely decrease with forest age, the site will probably become a GHG source once again as the trees do not compensate for the soil C and N losses. Also forests in younger age stages have been shown to have lower C assimilation rates; thus, the overall GHG sink potential of this afforested nutrient-rich organic soil is probably limited to the short period of maximum C assimilation.

show abstract

Section: Nee As Determined By Compartment Fluxesmentioning

confidence: 62%

A fertile peatland forest does not constitute a major greenhouse gas sink

et al. 2013

View full text Add to dashboard Cite

show abstract

“…For example, Dias et al (2010) found a linear relationship between soil respiration and plant species diversity of ground cover. Further, Mäkiranta et al (2008) detected a positive correlation between ground cover biomass and respiration. Nevertheless, the role of ground cover is rarely considered in the analysis of carbon balance in forest ecosystems (Goulden & Crill 1997, Law et al 1999, Kolari et al 2006, and it is essential to understand the effects of thinning on Rs when evaluating the reaction of undergrowth vegetation (Liang et al 2012).…”

Section: Effects Of Thinning On R Smentioning

confidence: 89%

Thinning effects on soil and microbial respiration in a coppice-originated Carpinus betulus L. stand in Turkey

Akburak¹,

Makineci²

2016

iForest

View full text Add to dashboard Cite

. However, there were no significant differences in either the second year or the 2-year study period. In the thinned plots during the research period, RS was linearly correlated with GC, Ts and FRB. Thinning treatments did not affect RSM, but interestingly, they did affect RFFM, which was greater in the control plots than in the thinned plots. RSM had a significant and positive correlation with soil N and soil pH, while R FFM was linearly correlated with FFC and C/N ratio of the forest floor in both thinned and control plots during the research period.

show abstract

“…Model validations across sites/microforms showed excellent agreements within RSE of 0.24-2.41 g·CO 2 ·m −2 growing season −1 (Table 1, Figure A1). Many investigations on peatland or forest respiration components have shown that warm and dry conditions enhance autotrophic [9,30,64,65] and heterotrophic [25,26,39] respiration emissions with greater impact over longer time scales [17,32,66]. Warmer air and soil temperatures stimulate microbial activity, resulting in increased respiration fluxes; however, T 5 response of R H depends on substrate type and availability of nutrients and moisture [67,68].…”

Section: Discussionmentioning

confidence: 99%

Partitioning Forest‐Floor Respiration into Source Based Emissions in a Boreal Forested Bog: Responses to Experimental Drought

Munir

Khadka

et al. 2017

Forests

View full text Add to dashboard Cite

Abstract:Northern peatlands store globally significant amounts of soil carbon that could be released to the atmosphere under drier conditions induced by climate change. We measured forest floor respiration (R FF ) at hummocks and hollows in a treed boreal bog in Alberta, Canada and partitioned the flux into aboveground forest floor autotrophic, belowground forest floor autotrophic, belowground tree respiration, and heterotrophic respiration using a series of clipping and trenching experiments. These fluxes were compared to those measured at sites within the same bog where water-table (WT) was drawn down for 2 and 12 years. Experimental WT drawdown significantly increased R FF with greater increases at hummocks than hollows. Greater R FF was largely driven by increased autotrophic respiration driven by increased growth of trees and shrubs in response to drier conditions; heterotrophic respiration accounted for a declining proportion of R FF with time since drainage. Heterotrophic respiration was increased at hollows, suggesting that soil carbon may be lost from these sites in response to climate change induced drying. Overall, although WT drawdown increased R FF , the substantial contribution of autotrophic respiration to R FF suggests that peat carbon stocks are unlikely to be rapidly destabilized by drying conditions.

show abstract

Factors causing temporal and spatial variation in heterotrophic and rhizospheric components of soil respiration in afforested organic soil croplands in Finland

Cited by 75 publications

References 45 publications

A fertile peatland forest does not constitute a major greenhouse gas sink

A fertile peatland forest does not constitute a major greenhouse gas sink

Thinning effects on soil and microbial respiration in a coppice-originated Carpinus betulus L. stand in Turkey

Partitioning Forest‐Floor Respiration into Source Based Emissions in a Boreal Forested Bog: Responses to Experimental Drought

Contact Info

Product

Resources

About