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Lucci, Gina (2007) Element balances and retention for wetlands in the forest environment. Other thesis, SLU.

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Abstract

The importance of water quality, protection of watersheds and restoration of aquatic ecosystems has steadily been gaining attention. Wetlands perform many functions that are beneficial to water quality, and also play an important role in forested landscapes. Peatlands in forested catchments act as both sinks and sources for different nutrients. The effects of leached nutrients from a forested catchment on a fen and the retention properties of the fen were investigated using data collected from the Bohyttan fen in the commune of Nora, Sweden. In addition, the effects of forestry management on nutrient loading and how the fen affects the flow of nutrients into the nearby lake were also investigated. Runoff measurements into and out of the fen were calculated using v-notch weirs and water level recorders. Water samples were collected monthly and used to calculate nutrient balances and retention of different elements. The effects of different forest management practices on nutrient leaching were investigated using the calibration period and control area technique. The peatland retention was obvious for nitrate (34%), ammonium (6%) phosphate (5%), potassium (8%) and sulfate (7%). Nitrate retention is beneficial for water quality and helps to mitigate the effects of nutrient leaching, however the peatland exported organic nitrogen (-6.5%) and iron (-9%). Results show that the effects of forestry practices like clear-cutting increased the transport of nitrate and potassium even six years after it was carried out. Ditching of a cleared forest stand lowered the groundwater and also caused a rise in the pH of nearby stream water. Leaching from forest land showed a correlation between high water color, DOC and iron concentrations. These conditions furnish additional organic matter and lead to a deterioration in water quality.

Item Type: Thesis (Other)
Keywords: Retention, element balances, wetlands, peatland, water quality, forestry
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Dept. of Forest Soils
Divisions: SLU > Faculty of Natural Resources and Agricultural Sciences
Depositing User: Gertrud Nordlander
Date Deposited: 06 Feb 2008
Last Modified: 18 Aug 2015 09:52
URI: http://ex-epsilon.slu.se/id/eprint/1751

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