Decomposition in peatlands: Reconciling seemingly contrasting results on the impacts of lowered water levels

Laiho, Raija

doi:10.1016/j.soilbio.2006.02.017

Cited by 387 publications

(322 citation statements)

References 111 publications

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“…Decomposition of the organic matter in peat soils depends mainly on peat type, environmental conditions, the decomposers present and nutrient availability (Laiho, 2006). All these factors interact, making it complicated to predict the decomposition rate.…”

Section: Discussionmentioning

confidence: 99%

Influence of water table level and soil properties on emissions of greenhouse gases from cultivated peat soil

Berglund

2011

Soil Biology and Biochemistry

134

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A lysimeter method using undisturbed soil columns was used to investigate the effect of water table depth and soil properties on soil organic matter decomposition and greenhouse gas (GHG) emissions from cultivated peat soils. The study was carried out using cultivated organic soils from two locations in Sweden: Örke, a typical cultivated fen peat with low pH and high organic matter content and Majnegården, a more uncommon fen peat type with high pH and low organic matter content. Even though carbon and nitrogen contents differ greatly between the sites, carbon and nitrogen density are quite similar. A drilling method with minimal soil disturbance was used to collect 12 undisturbed soil monoliths (50 cm high, ⌀29.5 cm) per site. They were sown with ryegrass (Lolium perenne) after the original vegetation was removed. The lysimeter design allowed the introduction of water at depth so as to maintain a constant water table at either 40 cm or 80 cm below the soil surface. CO 2 , CH 4 and N 2 O emissions from the lysimeters were measured weekly and complemented with incubation experiments with small undisturbed soil cores subjected to different tensions (5, 40, 80 and 600 cm water column). CO 2 emissions were greater from the treatment with the high water table level (40 cm) compared with the low level (80 cm). N 2 O emissions peaked in springtime and CH 4 emissions were very low or negative. Estimated GHG emissions during one year were between 2.70 and 3.55 kg CO 2 equivalents m -2 . The results from the incubation experiment were in agreement with emissions results from the lysimeter experiments. We attribute the observed differences in GHG emissions between the soils to the contrasting dry matter liability and soil physical properties. The properties of the different soil layers will determine the effect of water table regulation. Lowering the water table without exposing new layers with easily decomposable material would have a limited effect on emission rates.

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Section: Discussionmentioning

confidence: 99%

Influence of water table level and soil properties on emissions of greenhouse gases from cultivated peat soil

Berglund

2011

Soil Biology and Biochemistry

134

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“…Enhanced temperature and O 2 not only increased microbial quantity but also enriched the structure of soil microorganism community (Lee et al, 2012;Mikan et al, 2002). Bacteria, fungus and Actinomyce are the main decomposers in peatlands carbon dynamic (Briones et al, 2014;Laiho, 2006;Tveit et al, 2013), all involved in both AN and AE respiration (Szafranek-Nakonieczna and Stêpniewska, 2014). The increase of aerobic bacteria in O 2 abundant environment may lead to higher Rs.…”

Section: Roles Of Microbes Soil Enzyme and Soil Substratementioning

confidence: 99%

“…Large quantity of carbon deposits in peatlands is a result of the imbalance between production and decomposition (Knoblauch et al, 2013;Laiho, 2006). The decomposition was much lower than production for water saturated condition in peatlands and the consequent anaerobic environment accompanied with low temperature (Bubier et al, 2003;Griffis et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Warming leads to an earlier spring thawing in peatlands (Briones et al, 2014) with an advanced increase in microbial activity, as well as Rs. O 2 can activate most oxygen enzyme activities which could be a proximate control of soil organic matter (SOM) dynamics, especially in plateau peatlands (Laiho, 2006;Sinsabaugh et al, 2008;Tian and Shi, 2014). O 2 also relieves the inhibition effect of polyphenolic on soil hydrolase and microbial activity (Freeman et al, 1997;Freeman et al, 2001a).…”

Section: Introductionmentioning

confidence: 99%

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Responses of peat carbon at different depths to simulated warming and oxidizing

Liu

Chen

Zhu

et al. 2016

Science of The Total Environment

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“…Anoxia, low temperature and low pH conditions (Fenner and Freeman, 2011;Gorham, 1991;Laiho, 2006) resulted in the development of 4605 km 2 peatlands and an accumulation of approximately 0.48 Pg C (Chen et al, 2014). These peat areas are quite sensitive to climate change because they depend on the specific cool and humid climatic conditions (Essl et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of soil warming, rainfall reduction and water table level on CH 4 emissions from the Zoige peatland in China

Yang

Chen

et al. 2014

Soil Biology and Biochemistry

107

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Decomposition in peatlands: Reconciling seemingly contrasting results on the impacts of lowered water levels

Cited by 387 publications

References 111 publications

Influence of water table level and soil properties on emissions of greenhouse gases from cultivated peat soil

Influence of water table level and soil properties on emissions of greenhouse gases from cultivated peat soil

Responses of peat carbon at different depths to simulated warming and oxidizing

Effects of soil warming, rainfall reduction and water table level on CH 4 emissions from the Zoige peatland in China

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