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

Show full item record



Permalink

http://hdl.handle.net/10138/162689

Citation

Strakova , P , Niemi , M , Freeman , C , Peltoniemi , K , Toberman , H , Heiskanen , I , Fritze , H & Laiho , R 2011 , ' Litter type affects the activity of aerobic decomposers in a boreal peatland more than site nutrient and water level regimes ' , Biogeosciences , vol. 8 , pp. 2741-2755 . https://doi.org/10.5194/bg-8-2741-2011

Title: Litter type affects the activity of aerobic decomposers in a boreal peatland more than site nutrient and water level regimes
Author: Strakova, Petra; Niemi, Maarit; Freeman, Chris; Peltoniemi, Krista; Toberman, Hannah; Heiskanen, Ilse; Fritze, Hannu; Laiho, Raija
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2011
Language: eng
Belongs to series: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/162689
Abstract: Peatlands are carbon (C) storage ecosystems sustained by a high water level (WL). High WL creates anoxic conditions that suppress the activity of aerobic decomposers and provide conditions for peat accumulation. Peatland function can be dramatically affected by WL drawdown caused by land-use and/or climate change. Aerobic decomposers are directly affected by WL 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 WL drawdown on aerobic decomposer activity in plant litter. We did this by profiling 11 extracellular enzymes involved in the mineralization of organic C, nitrogen, phosphorus and sulphur. Our study sites represented a three-stage chronosequence from pristine (undrained) to short-term (years) and long-term (decades) WL drawdown conditions under two nutrient regimes. The litter types included reflected the prevalent vegetation, i.e., Sphagnum mosses, graminoids, shrubs and trees. WL drawdown had a direct and positive effect on microbial activity. Enzyme allocation shifted towards C acquisition, which caused an increase in the rate of decomposition. However, litter type overruled the direct effects of WL drawdown and was the main factor shaping microbial activity patterns. Our results imply that changes in plant community composition in response to persistent WL drawdown will strongly affect the C dynamics of peatlands.
Subject: 4112 Forestry
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
bg_8_2741_2011.pdf 2.762Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record