Regular Article

Plant and Soil

, Volume 335, Issue 1, pp 501-520

First online:

Litter quality and its response to water level drawdown in boreal peatlands at plant species and community level

  • Petra StrakováAffiliated withPeatland Ecology Group, Department of Forest Sciences, University of HelsinkiFinnish Forest Research Institute Email author 
  • , Jani AnttilaAffiliated withPeatland Ecology Group, Department of Forest Sciences, University of Helsinki
  • , Peter SpetzAffiliated withFinnish Forest Research Institute
  • , Veikko KitunenAffiliated withFinnish Forest Research Institute
  • , Tarja TapanilaAffiliated withFinnish Forest Research Institute
  • , Raija LaihoAffiliated withPeatland Ecology Group, Department of Forest Sciences, University of Helsinki

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Changes in the structure of plant communities may have much more impact on ecosystem carbon (C) cycling than any phenotypic responses to environmental changes. We studied these impacts via the response of plant litter quality, at the level of species and community, to persistent water-level (WL) drawdown in peatlands. We studied three sites with different nutrient regimes, and water-level manipulations at two time scales. The parameters used to characterize litter quality included extractable substances, cellulose, holocellulose, composition of hemicellulose (neutral sugars, uronic acids), Klason lignin, CuO oxidation phenolic products, and concentrations of C and several nutrients. The litters formed four chemically distinct groups: non-graminoid foliar litters, graminoids, mosses and woody litters. Direct effects of WL drawdown on litter quality at the species level were overruled by indirect effects via changes in litter type composition. The pristine conditions were characterized by Sphagnum moss and graminoid litters. Short-term (years) responses of the litter inputs to WL drawdown were small. In long-term (decades), total litter inputs increased, due to increased tree litter inputs. Simultaneously, the litter type composition and its chemical quality at the community level greatly changed. The changes that we documented will strongly affect soil properties and C cycle of peatlands.


Litter quality Litter inputs Peatlands Water level drawdown