Consequences of rewetting and ditch cleaning on hydrology, water quality and greenhouse gas balance in a drained northern landscape

Laudon, Hjalmar; Mosquera, Virginia; Eklöf, Karin; Järveoja, Järvi; Karimi, Shirin; Krasnova, Alisa; Peichl, Matthias; Pinkwart, Alexander; Tong, Cheuk Hei Marcus; Wallin, Marcus B; Zannella, Alberto; Hasselquist, Eliza Maher

doi:10.1038/s41598-023-47528-4

Cited by 9 publications

(2 citation statements)

References 66 publications

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“…Yet, even in the catchment with the higher solute concentration, the percentage of N removed was low (7%) compared with other studies, where the biochar was shown to reduce 58% of the TN concentration (Kakaei Lafdani et al, 2020). Or, even compared with the increase in DOC and TN after clear-cut (i.e., an average increase of 42% ± 8 and 56% ± 12, respectively) in our study sites (Laudon et al, 2023). However, the observed low adsorption capacity might be an artifact of our filter setup, particularly when compared with other configurations such as horizontally oriented columns with longer residence time (Kakaei Lafdani et al, 2020).…”

Section: Biochar To Adsorb Nutrients In Field Conditionscontrasting

confidence: 82%

Biochar as a potential tool to mitigate nutrient exports from managed boreal forest: A laboratory and field experiment

Mosquera,

Gundale,

Palviainen

et al. 2024

GCB Bioenergy

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Forest management in drained forested peatlands can negatively affect water quality due to the increase in exports of organic matter and nutrients. Therefore, new methods to alleviate this impact are needed. In laboratory conditions, biochar has been shown to be a strong sorbent of organic and inorganic nutrients due to its high surface area and ion‐exchange capacity. However, evidence of the adsorption capacity in field conditions is lacking. Here, we studied the water purification performance of two different biochar feedstocks (wood‐ and garden residue‐based) in a 10‐day laboratory experiment where we incubated biochar with runoff water collected from drainage ditches in clear‐cut peatland forests. We measured changes in pH and concentrations of inorganic phosphorus (PO4), total dissolved nitrogen (TDN), and dissolved organic carbon (DOC). The biochar with the best adsorbent capacity in the laboratory experiment was then tested in field conditions in a replicated catchment‐scale experiment, where both clear‐cutting and ditch cleaning were performed. We determined the nutrient concentration of water at the inlet and outlet of biochar filters placed in outflow ditches of four catchments. We found that under laboratory conditions wood‐based biochar efficiently adsorbed TDN and DOC, however, it released PO4. Furthermore, we found that the biochar filters reduced TDN and DOC concentration in field conditions. However, the percentage decrease in concentration was dependent on the initial concentrations of nutrients in the water and could be considered low. Moreover, we found that the biochar in the filters increased in TN content over the course of the experiment. This suggests that a wood‐based biochar filter has the potential to be a water protection tool for reducing the export of nutrients from catchments with high nutrient concentration. And that the biochar from the ditches could be applied back to the regenerating forest catchment as a potential soil amendment, closing the nutrient cycle.

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Section: Biochar To Adsorb Nutrients In Field Conditionscontrasting

confidence: 82%

Biochar as a potential tool to mitigate nutrient exports from managed boreal forest: A laboratory and field experiment

Mosquera,

Gundale,

Palviainen

et al. 2024

GCB Bioenergy

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“…Large areas of peatland are used for agriculture or forestry. As one form of environmental interference, research found that the blocking ditch that occurred in the first two years after wetness significantly increased groundwater levels [23]. In Europe, more than half of the total peatland has been dried for agriculture or forestry [24].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Greenhouse Gas Emission Patterns in Different Water Levels in Peatlands

Peng,

Li,

Yang

et al. 2024

Water

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Peatlands store large amounts of carbon in wetland ecosystems. The hydrological conditions within peatlands are important factors that affect the biochemical cycle and patterns of greenhouse gas emissions in these peatlands. This study was carried out in Changbai Mountain Jinchuan peatland to investigate variations in carbon dioxide and methane emissions in peat swamps that have undergone distinct saturation conditions. Three peatland types (high water levels (S1); medium water levels (S2); low water levels (S3)) at different flood depths were selected as specific sampling points. The static box and gas chromatography methods were used at different time periods (6:00; 12:00; and 18:00) from July to September. The discharge flux of CO2 and CH4 slowly increased with the increase in the water level. The results indicate similarity in the fluctuation trends between the fluxes of CO2 and CH4 in S1 and S2 to the fluctuations of water levels. During the entire growth season, the flux range of CO2 and CH4 was −695.329~859.907 mg m2h−1 and 259.981~147.155 mg m2h−1, respectively. Furthermore, there was variation in mutation characteristics between two gases, the CO2 exhibited larger mutation range (−7.08~3.40)than CH4 (−1.79~1.26). In terms of daily flux changes, CO2 showed an upward trend, while CH4 had a downward trend. These results indicate variations in saturation conditions tend to affect discharge of greenhouse gases, with subsequent effects on climate change. This study highlights potential theoretical support to reduce anthropogenic activities on peatlands. This can be achieved by undertaking measures to conserve peatlands and explore mitigation measures to minimize greenhouse gas emissions and hence impacts of climate change.

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Water Quality

Sarkkola,

Nieminen,

Laudon

et al. 2024

Managing Forest Ecosystems

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Conventional forest operations can exert significant impacts on the hydrology and water quality of downstream aquatic environments. Few research results have been published on the impacts of continuous cover forestry (CCF) on water quality. CCF could be useful for reducing nutrient, carbon, and suspended solid exports in waterways. CCF may be a better alternative to rotation forestry (RF) on mineral soils and drained peatlands. Further research is needed on the many processes controlling nutrient and carbon exports in CCF and RF.

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Consequences of rewetting and ditch cleaning on hydrology, water quality and greenhouse gas balance in a drained northern landscape

Cited by 9 publications

References 66 publications

Biochar as a potential tool to mitigate nutrient exports from managed boreal forest: A laboratory and field experiment

Biochar as a potential tool to mitigate nutrient exports from managed boreal forest: A laboratory and field experiment

A Comparison of Greenhouse Gas Emission Patterns in Different Water Levels in Peatlands

Water Quality

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