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Quantifying moss moisture stresses in undrained, afforested and rewetted peatlands located in Republic of Ireland using laboratory measurements and computer modelling

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posted on 2022-10-14, 13:32 authored by Amey S. Tilak, KENNETH BYRNEKENNETH BYRNE, Antonio Jonay Jovani-Sancho, Matthew Saunders, Seamus Hoyne
This study utilized site-specific peat hydrophysical properties (inverse of air-entry pressure, α; pore size distribution index, n; saturated hydraulic conductivity, Ks; and pore tortuosity, L) as inputs into the HYDRUS 1-D computer model for quantifying moss moisture stresses on Irish peatlands. The site-specific peat hydrophysical properties computed using pedotransfer functions obtained from laboratory measured bulk density (BD) and % organic matter (OM). The peat samples obtained from undrained sites (Scohaboy, Pollagoona and Lough Ghe), three afforested sites (S18, S28 and S44) and rewetted sites (Scohaboy and Pollagoona). The moss moisture stresses quantified using a known ecohydrological threshold of −100 cm. The site-specific peat hydrophysical properties, four initial WTDs (3, 8, 20 and 30 cm) and two distinct precipitation regimes (single and consecutive 4 years having severely dry [SD], extremely dry [ED], near normal [NN], very wet [VW] and extremely wet [EW] periods) were inputs into HYDRUS 1-D model. The modelling results showed that none of the peatland sites ever reached −100 cm threshold in single year simulations at all initial WTDs. However, in the consecutive 4-year simulations, Scohaboy, Pollagoona and Lough Ghe undrained, S28 afforested and Pollagoona rewetted sites first reached −100 cm threshold on 516, 508, 624, 1329 and 517 day, respectively. In the consecutive 4-year simulations, undrained Scohaboy, Pollagoona, Lough Ghe, S28 afforested and Pollagoona rewetted reached −100 cm threshold in ED and SD years. We concluded that moss recolonization is likely to be successfully on peatlands having minimal to no −100 cm threshold days.

History

Publication

Ecohydrology; e2374

Publisher

Wiley and Sons Ltd

Note

peer-reviewed The full text of this article will not be available in ULIR until the embargo expires on the 25/10/2022

Other Funding information

European Union (EU)

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This is the peer reviewed author version of the following article: Quantifying moss moisture stresses in undrained, afforested and rewetted peatlands located in Republic of Ireland using laboratory measurements and computer modelling , Ecohydrology which has been published in final form at https://doi.org/10.1002/eco.2374 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. http://olabout.wiley.com/WileyCDA/Section/id-828039.html#terms

Language

English

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