Data from: Lichens: a limit to peat growth?

1. The fruticose lichens Cladina stellaris and Cladina rangiferina, form thick mats that can cover large areas of northern peatlands (above ~ 50° latitude), including the extensive peatlands of the Hudson Bay Lowland (HBL) in Canada, where lichens may cover up to 50 % of the landscape. Despite the a...

Full description

Bibliographic Details
Main Authors: Harris, Lorna I., Moore, Tim R., Roulet, Nigel T., Pinsonneault, Andrew J.
Format: Dataset
Language:unknown
Published: 2019
Subjects:
Online Access:https://doi.org/10.5061/dryad.s136dc8
id fttriple:oai:gotriple.eu:50|dedup_wf_001::0ec8f484ac7834b7a65b86582a258422
record_format openpolar
spelling fttriple:oai:gotriple.eu:50|dedup_wf_001::0ec8f484ac7834b7a65b86582a258422 2023-05-15T16:35:33+02:00 Data from: Lichens: a limit to peat growth? Harris, Lorna I. Moore, Tim R. Roulet, Nigel T. Pinsonneault, Andrew J. 2019-01-01 https://doi.org/10.5061/dryad.s136dc8 undefined unknown http://dx.doi.org/10.5061/dryad.s136dc8 https://dx.doi.org/10.5061/DRYAD.S136DC8 lic_creative-commons oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:103165 oai:easy.dans.knaw.nl:easy-dataset:103165 10.5061/DRYAD.S136DC8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 re3data_____::r3d100000044 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f Life sciences medicine and health care (:tba) Plant–soil (below-ground) interactions productivity peat decomposition lichens northern peatlands peat accumulation Sphagnum envir anthro-bio Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2019 fttriple https://doi.org/10.5061/dryad.s136dc8 https://doi.org/10.5061/DRYAD.S136DC8 2023-01-22T17:22:51Z 1. The fruticose lichens Cladina stellaris and Cladina rangiferina, form thick mats that can cover large areas of northern peatlands (above ~ 50° latitude), including the extensive peatlands of the Hudson Bay Lowland (HBL) in Canada, where lichens may cover up to 50 % of the landscape. Despite the abundance of lichens in northern peatlands, our understanding of their role within peatland ecosystems, and peat accumulation in particular, is limited. 2. We investigate the potential effect of these mat-forming lichens on peat production and decomposition processes, using field data from an ombrogenous bog in the HBL and laboratory analyses. We hypothesise that (a) production in lichen-shrub hummocks is less than in Sphagnum-shrub hummocks; (b) the decay of lichen litter is faster than that of Sphagnum moss so the mass litter input to the peat profile is reduced; and (c) faster decomposition of the underlying peat is stimulated by lichen leachates, resulting in greater mass loss. 3. We found that thick lichen mats alter vegetation composition in peatlands, reducing Sphagnum cover and inhibiting the growth of small shrubs. Coupled with low lichen productivity that is constrained by moisture conditions, production for lichen-shrub hummocks is significantly smaller than for Sphagnum-shrub hummocks, confirming hypothesis (a). Our data also support hypothesis (b), with chemical analyses of lichen mats and leachates from lichen mats indicating faster decay of lichens compared to Sphagnum moss, and therefore reduced mass litter input to the peat profile in lichen-dominated hummocks. Although we found no evidence to suggest leachates from lichens enhance decomposition processes in peatlands (hypothesis c), larger dry bulk densities for peat under lichen mats indicate a loss of structural integrity and potential collapse of the peat column. 4. Synthesis: As production of new material added to the peat column is less in lichen-dominated hummocks, local peat accumulation slows or ceases, representing a potential temporary limit ... Dataset Hudson Bay Unknown Hudson Bay Canada Hudson
institution Open Polar
collection Unknown
op_collection_id fttriple
language unknown
topic Life sciences
medicine and health care
(:tba)
Plant–soil (below-ground) interactions
productivity
peat decomposition
lichens
northern peatlands
peat accumulation
Sphagnum
envir
anthro-bio
spellingShingle Life sciences
medicine and health care
(:tba)
Plant–soil (below-ground) interactions
productivity
peat decomposition
lichens
northern peatlands
peat accumulation
Sphagnum
envir
anthro-bio
Harris, Lorna I.
Moore, Tim R.
Roulet, Nigel T.
Pinsonneault, Andrew J.
Data from: Lichens: a limit to peat growth?
topic_facet Life sciences
medicine and health care
(:tba)
Plant–soil (below-ground) interactions
productivity
peat decomposition
lichens
northern peatlands
peat accumulation
Sphagnum
envir
anthro-bio
description 1. The fruticose lichens Cladina stellaris and Cladina rangiferina, form thick mats that can cover large areas of northern peatlands (above ~ 50° latitude), including the extensive peatlands of the Hudson Bay Lowland (HBL) in Canada, where lichens may cover up to 50 % of the landscape. Despite the abundance of lichens in northern peatlands, our understanding of their role within peatland ecosystems, and peat accumulation in particular, is limited. 2. We investigate the potential effect of these mat-forming lichens on peat production and decomposition processes, using field data from an ombrogenous bog in the HBL and laboratory analyses. We hypothesise that (a) production in lichen-shrub hummocks is less than in Sphagnum-shrub hummocks; (b) the decay of lichen litter is faster than that of Sphagnum moss so the mass litter input to the peat profile is reduced; and (c) faster decomposition of the underlying peat is stimulated by lichen leachates, resulting in greater mass loss. 3. We found that thick lichen mats alter vegetation composition in peatlands, reducing Sphagnum cover and inhibiting the growth of small shrubs. Coupled with low lichen productivity that is constrained by moisture conditions, production for lichen-shrub hummocks is significantly smaller than for Sphagnum-shrub hummocks, confirming hypothesis (a). Our data also support hypothesis (b), with chemical analyses of lichen mats and leachates from lichen mats indicating faster decay of lichens compared to Sphagnum moss, and therefore reduced mass litter input to the peat profile in lichen-dominated hummocks. Although we found no evidence to suggest leachates from lichens enhance decomposition processes in peatlands (hypothesis c), larger dry bulk densities for peat under lichen mats indicate a loss of structural integrity and potential collapse of the peat column. 4. Synthesis: As production of new material added to the peat column is less in lichen-dominated hummocks, local peat accumulation slows or ceases, representing a potential temporary limit ...
format Dataset
author Harris, Lorna I.
Moore, Tim R.
Roulet, Nigel T.
Pinsonneault, Andrew J.
author_facet Harris, Lorna I.
Moore, Tim R.
Roulet, Nigel T.
Pinsonneault, Andrew J.
author_sort Harris, Lorna I.
title Data from: Lichens: a limit to peat growth?
title_short Data from: Lichens: a limit to peat growth?
title_full Data from: Lichens: a limit to peat growth?
title_fullStr Data from: Lichens: a limit to peat growth?
title_full_unstemmed Data from: Lichens: a limit to peat growth?
title_sort data from: lichens: a limit to peat growth?
publishDate 2019
url https://doi.org/10.5061/dryad.s136dc8
geographic Hudson Bay
Canada
Hudson
geographic_facet Hudson Bay
Canada
Hudson
genre Hudson Bay
genre_facet Hudson Bay
op_source oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:103165
oai:easy.dans.knaw.nl:easy-dataset:103165
10.5061/DRYAD.S136DC8
10|eurocrisdris::fe4903425d9040f680d8610d9079ea14
10|re3data_____::84e123776089ce3c7a33db98d9cd15a8
10|openaire____::9e3be59865b2c1c335d32dae2fe7b254
re3data_____::r3d100000044
10|re3data_____::94816e6421eeb072e7742ce6a9decc5f
op_relation http://dx.doi.org/10.5061/dryad.s136dc8
https://dx.doi.org/10.5061/DRYAD.S136DC8
op_rights lic_creative-commons
op_doi https://doi.org/10.5061/dryad.s136dc8
https://doi.org/10.5061/DRYAD.S136DC8
_version_ 1766025794742648832