Ecosystems

, Volume 10, Issue 6, pp 949–963 | Cite as

Litter Decomposition in Temperate Peatland Ecosystems: The Effect of Substrate and Site

Article

Abstract

The large accumulation of organic matter in peatlands is primarily caused by slow rates of litter decomposition. We determined rates of decomposition of major peat-forming litters of vascular plants and mosses at five sites: a poor fen in New Hampshire and a bog hummock, a poor fen, a beaver pond margin and a beaver pond in Ontario. We used the litterbag technique, retrieving triplicate litterbags six or seven times over 3–5 years, and found that simple exponential decay and continuous-quality non-linear regression models could adequately characterize the decomposition in most cases. Within each site, the rate of decomposition at the surface was generally Typha latifolia leaves = Chamaedaphne calyculata leaves = Carex leaves > Chamaedaphne calyculata stems > hummock Sphagnum = lawn/hollow Sphagnum, with exponential decay constant (k) values generally ranging from 0.05 to 0.37 and continuous-quality model initial quality (q 0 ) values ranging from 1.0 (arbitrarily set for Typha leaves) to 0.7 (Sphagnum). In general, surface decay rates were slowest at the bog hummock site, which had the lowest water table, and in the beaver pond, which was inundated, and fastest at the fens. The continuous-quality model site decomposition parameter (u 0 ) ranged from 0.80 to 0.17. Analysis of original litter samples for carbon, nitrogen and proximate fractions revealed a relatively poor explanation of decomposition rates, as defined by k and q 0 , compared to most well-drained ecosystems. Three litters, roots of sedge and a shrub and Typha leaves, were placed at depths of 10, 30 and 60 cm at the sites. Decomposition rates decreased with depth at each site, with k means of 0.15, 0.08 and 0.05 y−1 at 10, 30 and 60 cm, respectively, and u 0 of 0.25, 0.13 and 0.07. These differences are primarily related to the position of the water table at each site and to a lesser extent the cooler temperatures in the lower layers of the peat. The distinction between bog and fen was less important than the position of the water table. These results show that we can characterize decomposition rates of surface litter in northern peatlands, but given the large primary productivity below-ground in these ecosystems, and the differential rates of decomposition with depth, subsurface input and decomposition of organic matter is an important and relatively uncertain attribute.

Keywords

bog fen sedge moss shrub roots 

Notes

ACKNOWLEDGEMENTS

This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada (to TM) and from the U.S. National Science Foundation (NSF grant DEB-0346625 (to JB)). We gratefully acknowledge the field and laboratory assistance of Mike Dalva, Andy Mosedale, Ruth Varner and several Mount Holyoke students. Professor Göran Ågren, of the Swedish University of Agricultural Sciences, Uppsala, suggested the use of the continuous-quality model and we are grateful for his advice in its implementation. Infrastructural facilities at Mer Bleue that made this work possible are supported by the Fluxnet Canada Research Network and at Sallie’s Fen by NSF LTREB Program grant DEB-0316326.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Tim R. Moore
    • 1
  • Jill L. Bubier
    • 2
  • Leszek Bledzki
    • 2
  1. 1.Department of Geography and Global Environmental and Climate Change CentreMcGill UniversityMontrealCanada
  2. 2.Environmental Studies Program, Department of Earth and EnvironmentMount Holyoke CollegeSouth HadleyUSA

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