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Piping and woody plants in peatlands: Cause or effect?

Holden, Joseph (2005) Piping and woody plants in peatlands: Cause or effect? Water Resources Research, 41 (6). W06009. ISSN 0043-1397

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Abstract

This paper presents, for the first time, evidence to show that Calluna species are one causative factor of piping in blanket peat catchments. Ground-penetrating radar survey on 960 plots illustrated that piping was prevalent throughout blanket peats. However, soil pipe occurrence was significantly higher where bare peat (149 pipes/km) or Calluna (87 pipes/km) were present compared to other species (67 pipes/km). A case study catchment where there was an altitudinal limit to Calluna provided some control over potential factors that may lead to an association between piping and Calluna. Under the controlled conditions of topographic index, peat depth, and water table, piping was greater under the Calluna-covered peat than under other vegetation covers. Laboratory experiments demonstrated that 10 years worth of rainfall was enough to almost double the proportion of macropore flow occurring in recently colonized Calluna peatlands. This suggests that given enough water and time, the woody Calluna plants result in water being preferentially channeled through the upper peat. Improvements are therefore required in our understanding of the relationships between peatland plant nutrient and water supply and the feedbacks between ecosystem functioning and landform development. These results are also important given the propensity to encourage Calluna growth for game bird enhancement in many northern peatlands.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright 2005 by the American Geophysical Union. 0043-1397/05/2004WR003909$09.00. An edited version of this paper was published by AGU.
Keywords: Piping, woody plants, peatlands
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds)
Depositing User: S.A Khan
Date Deposited: 11 Oct 2006
Last Modified: 08 Feb 2013 17:02
Published Version: http://dx.doi.org/10.1029/2004WR003909
Status: Published
Publisher: American Geophysical Union
Refereed: Yes
Identification Number: 10.1029/2004WR003909
URI: http://eprints.whiterose.ac.uk/id/eprint/1605

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