Responses of aerobic microbial communities and soil respiration to water‐level drawdown in a northern boreal fen

Jaatinen, Krista; Laiho, Raija; Vuorenmaa, Anita; Castillo, Urko del; Minkkinen, Kari; Pennanen, Taina; Penttilä, Timo; Fritze, Hannu

doi:10.1111/j.1462-2920.2007.01455.x

Cited by 111 publications

(71 citation statements)

References 78 publications

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“…Indeed, laboratory and field experiments have demonstrated that mass loss is higher under aerobic conditions than under anaerobic conditions [Belyea, 1996;Scanlon and Moore, 2000;Yavitt et al, 2000;Blodau et al, 2004;Laiho, 2006;Moore and Basiliko, 2006;Jaatinen et al, 2008;Wickland and Neff, 2008]. In Figure 3, mass losses from vascular plant litter and Sphagnum litter decomposing in parallel under aerobic and anaerobic conditions are compared.…”

Section: Litter Decomposition In Aerobic Versus Anaerobic Conditionsmentioning

confidence: 99%

Plant Litter Decomposition and Nutrient Release in Peatlands

Bragazza

Buttler

Siegenthaler

et al. 2013

Carbon Cycling in Northern Peatlands

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Section: Litter Decomposition In Aerobic Versus Anaerobic Conditionsmentioning

confidence: 99%

Plant Litter Decomposition and Nutrient Release in Peatlands

Bragazza

Buttler

Siegenthaler

et al. 2013

Carbon Cycling in Northern Peatlands

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“…True chimeric and clearly non-fungal or non-actinobacterial sequences were eliminated from further analyses. Phylogenetic analyses were conducted as in Jaatinen et al (2008).…”

Section: Microbial Community Analysesmentioning

confidence: 99%

“…The structure of the peatland microbial community varies with the plant community (Borgå et al, 1994;Fisk et al, 2003;Thormann et al, 2004;Jaatinen et al, 2007Jaatinen et al, , 2008, and it has been shown that changes in peatland hydrology affect both (Jaatinen et al, 2007;Peltoniemi et al, 2009). Microbial responses in the form of enzyme activities have been detected (Fenner et al, 2005a;Toberman et al, 2010) and may be directly induced by the increased availability of oxygen and/or changes in pH.…”

Section: Introductionmentioning

confidence: 99%

Litter type affects the activity of aerobic decomposers in a boreal peatland more than site nutrient and water table regimes

et al. 2011

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Abstract. Peatlands are carbon (C) storage ecosystems sustained by a high water table (WT). High WT creates anoxic conditions that suppress the activity of aerobic decomposers and provide conditions for peat accumulation. Peatland function can be dramatically affected by WT drawdown caused by climate and/or land-use change. Aerobic decomposers are directly affected by WT drawdown through environmental factors such as increased oxygenation and nutrient availability. Additionally, they are indirectly affected via changes in plant community composition and litter quality. We studied the relative importance of direct and indirect effects of WT drawdown on aerobic decomposer activity in plant litter at two stages of decomposition (incubated in the field for 1 or 2 years). We did this by profiling 11 extracellular enzymes involved in the mineralization of organic C, nitrogen (N), phosphorus (P) and sulphur. Our study sites represented a three-stage chronosequence from pristine to shortterm (years) and long-term (decades) WT drawdown conditions under two nutrient regimes (bog and fen). The litter types included reflected the prevalent vegetation: Sphagnum mosses, graminoids, shrubs and trees.Litter type was the main factor shaping microbial activity patterns and explained about 30 % of the variation in enzyme activities and activity allocation. Overall, enzyme activities were higher in vascular plant litters compared to Sphagnum litters, and the allocation of enzyme activities towards C or nutrient acquisition was related to the initial litter quality Correspondence to: P. Straková (petra.strakova@helsinki.fi) (chemical composition). Direct effects of WT regime, site nutrient regime and litter decomposition stage (length of incubation period) summed to only about 40 % of the litter type effect. WT regime alone explained about 5 % of the variation in enzyme activities and activity allocation. Generally, enzyme activity increased following the long-term WT drawdown and the activity allocation turned from P and N acquisition towards C acquisition. This caused an increase in the rate of litter decomposition. The effects of the shortterm WT drawdown were minor compared to those of the long-term WT drawdown: e.g., the increase in the activity of C-acquiring enzymes was up to 120 % (bog) or 320 % (fen) higher after the long-term WT drawdown compared to the short-term WT drawdown. In general, the patterns of microbial activity as well as their responses to WT drawdown depended on peatland type: e.g., the shift in activity allocation to C-acquisition was up to 100 % stronger at the fen compared to the bog.Our results imply that changes in plant community composition in response to persistent WT drawdown will strongly affect the C dynamics of peatlands. The predictions of decomposer activity under changing climate and/or land-use thus cannot be based on the direct effects of the changed environment only, but need to consider the indirect effects of environmental changes: the changes in plant community composition, their dependen...

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“…This alters the functioning and surface structure of the peatland, increasing the aerated volume of the surface peat where rapid decomposition is possible (Freeman et al, 2001;Jaatinen et al, 2008) and causing subsidence of the soil first by physical compression, removing the supporting pressure of the water and then by the increased decomposition of the surface peat layers (Minkkinen & Laine, 1998;Jaatinen et al, 2008).…”

Section: Exploitation Of Peatlandsmentioning

confidence: 99%

Impacts of restoration of forestry-drained peatlands on nutrient and organic carbon exports and methane dynamics

Koskinen

2016

Diss. For.

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3Koskinen M. (2016). Impacts of restoration of forestry-drained peatlands on nutrient and organic carbon exports and methane dynamics. Dissertationes Forestales 232, 36p. http://dx.doi.org/10.14214/df.232In this study, the effects of restoration of forestry-drained peatlands on the nutrient and organic carbon exports and methane dynamics of the restored sites are explored. The study consists of four sub-studies. Two of the sub-studies are concerned with the effects on water quality and export of elements of restoration and were conducted on a catchment scale. One of the studies was conducted in the laboratory, and assessed the release of elements from peat samples under anaerobic inundation simulating the effects of a rising water table after restoration or logging. The fourth study was again a field study, in which the differences in methane emissions between undrained, drained and restored spruce swamp forests were assessed. In all, 24 different pristine, drained and restored sites are featured in the study, one site being present in two of the sub-studies.The results indicate potentially large effects of restoration especially on the nutrient rich spruce-dominated sites, which had the highest restoration-induced increases in organic carbon and nutrient exports in the catchment studies, and which also exhibited high methane emissions after restoration, higher than in the undrained or drained state. The results should prompt research into the techniques applied in restoration of such sites and into the processes which lie behind these large effects. After that I had a period of several years of no chance to work on the PhD project, during which I was given the chance to work on greenhouse gas measurement methodology by Dr. Kari Minkkinen. Under his supervision I learned programming, gas measurements, statistics and scientific writing. I also worked with Dr. Paavo Ojanen from the department, as well as with Dr. Annalea Lohila from the Finnish Meteorological Institute. Great times were had. Thank you for tolerating my temperament during the field work, and Paavo especially for all the conversations over the years.The good will of Prof. Eeva-Stiina Tuittila, now in the University of Eastern Finland, was instrumental for the methane study. I also want to thank our field workers, Jyri Mikkola, Mirkka Kotiaho, Janne Sormunen and Salli Uljas. Dr. Liisa Maanavilja provided insight on the sites. PhD candidate Maija Lampela assisted me with topographical measurements in the field.When it seemed improbable that I could ever make a thesis on the water quality effects of restoration of forestry-drained peatlands, Dr. Mika Nieminen from the Natural Resources Institute (then METLA) got a grant from the Maj and Tor Nessling foundation to do just that, and asked me if I would be the N.N. for whose work the funds had been granted. I said yes, and haven't regretted it. He has taught me a lot on getting work published. I have also had the opportunity to work with PhD candidate Annu Kaila, whose painstaking laboratory work and theo...

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Responses of aerobic microbial communities and soil respiration to water‐level drawdown in a northern boreal fen

Cited by 111 publications

References 78 publications

Plant Litter Decomposition and Nutrient Release in Peatlands

Plant Litter Decomposition and Nutrient Release in Peatlands

Litter type affects the activity of aerobic decomposers in a boreal peatland more than site nutrient and water table regimes

Impacts of restoration of forestry-drained peatlands on nutrient and organic carbon exports and methane dynamics

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