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Dissolved organic carbon production and runoff quality following peatland extraction and restoration

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Title: Dissolved organic carbon production and runoff quality following peatland extraction and restoration
Authors: Strack, M.1 mstrack@ucalgary.ca, Tóth, K.2, Bourbonniere, R.3, Waddington, J.M.2
Source: Ecological Engineering. Dec2011, Vol. 37 Issue 12, p1998-2008. 11p.
Subjects: Carbon compounds, Runoff, Water quality, Peatland restoration, Temperature effect, Herbaceous plants, Humic acid, Chemical decomposition
Abstract: Abstract: We examined dissolved organic carbon (DOC) production and quality in a cutover (extracted) and restored peatland in eastern Québec through a combined laboratory DOC production study and an accompanying field DOC runoff quality study. Both temperature and substrate were significant for explaining variability in net DOC production rate in both short (5 days) and longer term (25 day) laboratory incubations. Moss (Sphagnum spp. and Polytricum spp.) produced the least amount of DOC, with initial release rates of 0.02–0.35mgDOCg−1 d−1. Shrubs, and to a lesser extent herbaceous vegetation, showed an initial high release of DOC followed by a decrease. Peat from the restored site had significantly higher longer-term DOC production rates than the cutover site. Humic acid (HA) was more likely to be produced by shrub and herbaceous plant material than by peat, mosses and straw. The hydrophilic (HPI) fraction of the DOC increased at higher temperatures. Despite differences in the surface cover of available substrate (e.g. vascular vegetation, moss, and straw), there was no difference in the quality of DOC exported from the cutover and restored sites. However, hydrological and biogeochemical controls were apparent in temporal variability of DOC quality in discharge. DOC exported during snowmelt and most storm events was high in HPI with little contribution from HA. Since contact time between water and soil is limited during these high flow periods, larger more hydrophobic HA molecules are less likely to be mobilized. Higher export of HA in summer compared to spring and autumn suggests that polycondensation and increased vascular plant productivity are important for controlling seasonal patterns of DOC export quality. As various substrates produced different amounts and quality of DOC, it is likely that the DOC quality exported from the restored site will continue to change as the new vegetation community develops. DOC production rates and DOC quality should be considered when developing a plan to control DOC runoff/export from managed peatlands. [Copyright &y& Elsevier]
Copyright of Ecological Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Dissolved organic carbon production and runoff quality following peatland extraction and restoration
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  Data: <searchLink fieldCode="AR" term="%22Strack%2C+M%2E%22">Strack, M.</searchLink><relatesTo>1</relatesTo><i> mstrack@ucalgary.ca</i><br /><searchLink fieldCode="AR" term="%22Tóth%2C+K%2E%22">Tóth, K.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Bourbonniere%2C+R%2E%22">Bourbonniere, R.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Waddington%2C+J%2EM%2E%22">Waddington, J.M.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Ecological+Engineering%22">Ecological Engineering</searchLink>. Dec2011, Vol. 37 Issue 12, p1998-2008. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+compounds%22">Carbon compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Runoff%22">Runoff</searchLink><br /><searchLink fieldCode="DE" term="%22Water+quality%22">Water quality</searchLink><br /><searchLink fieldCode="DE" term="%22Peatland+restoration%22">Peatland restoration</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Herbaceous+plants%22">Herbaceous plants</searchLink><br /><searchLink fieldCode="DE" term="%22Humic+acid%22">Humic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+decomposition%22">Chemical decomposition</searchLink>
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  Data: Abstract: We examined dissolved organic carbon (DOC) production and quality in a cutover (extracted) and restored peatland in eastern Québec through a combined laboratory DOC production study and an accompanying field DOC runoff quality study. Both temperature and substrate were significant for explaining variability in net DOC production rate in both short (5 days) and longer term (25 day) laboratory incubations. Moss (Sphagnum spp. and Polytricum spp.) produced the least amount of DOC, with initial release rates of 0.02–0.35mgDOCg−1 d−1. Shrubs, and to a lesser extent herbaceous vegetation, showed an initial high release of DOC followed by a decrease. Peat from the restored site had significantly higher longer-term DOC production rates than the cutover site. Humic acid (HA) was more likely to be produced by shrub and herbaceous plant material than by peat, mosses and straw. The hydrophilic (HPI) fraction of the DOC increased at higher temperatures. Despite differences in the surface cover of available substrate (e.g. vascular vegetation, moss, and straw), there was no difference in the quality of DOC exported from the cutover and restored sites. However, hydrological and biogeochemical controls were apparent in temporal variability of DOC quality in discharge. DOC exported during snowmelt and most storm events was high in HPI with little contribution from HA. Since contact time between water and soil is limited during these high flow periods, larger more hydrophobic HA molecules are less likely to be mobilized. Higher export of HA in summer compared to spring and autumn suggests that polycondensation and increased vascular plant productivity are important for controlling seasonal patterns of DOC export quality. As various substrates produced different amounts and quality of DOC, it is likely that the DOC quality exported from the restored site will continue to change as the new vegetation community develops. DOC production rates and DOC quality should be considered when developing a plan to control DOC runoff/export from managed peatlands. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Ecological Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ecoleng.2011.08.015
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 1998
    Subjects:
      – SubjectFull: Carbon compounds
        Type: general
      – SubjectFull: Runoff
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      – SubjectFull: Water quality
        Type: general
      – SubjectFull: Peatland restoration
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Herbaceous plants
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      – SubjectFull: Humic acid
        Type: general
      – SubjectFull: Chemical decomposition
        Type: general
    Titles:
      – TitleFull: Dissolved organic carbon production and runoff quality following peatland extraction and restoration
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              Text: Dec2011
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