Carbon, Nutrients and Methylmercury in Water from Small Catchments Affected by Various Forest Management Operations

Forest management activities in boreal and hemiboreal environments have been found to increase the concentration of carbon, nutrients, and methylmercury (MeHg) in runoff water, thus contributing to environmental quality issues. We evaluated carbon, nutrient, and MeHg concentrations in water at eight...

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Veröffentlicht in:Forests 2021-09, Vol.12 (9), p.1278, Article 1278
Hauptverfasser: Klavina, Zane, Bardule, Arta, Eklof, Karin, Bitenieks, Kriss, Klavins, Ivars, Libiete, Zane
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container_start_page 1278
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creator Klavina, Zane
Bardule, Arta
Eklof, Karin
Bitenieks, Kriss
Klavins, Ivars
Libiete, Zane
description Forest management activities in boreal and hemiboreal environments have been found to increase the concentration of carbon, nutrients, and methylmercury (MeHg) in runoff water, thus contributing to environmental quality issues. We evaluated carbon, nutrient, and MeHg concentrations in water at eight small, forested catchments on organic soils in Latvia, subject to ditch cleaning and beaver dam removal. These management-induced disturbances were classified into a major, minor, or no disturbance classes. The concentrations of dissolved organic carbon and total nitrogen were elevated in disturbed catchments (both major and minor) compared to the catchments with no disturbance. The concentrations of MeHg in the water displayed a clear seasonal variation with higher concentrations in spring and summer, but there were no significant differences in MeHg concentrations between catchments with major, minor, and no disturbances. However, the higher concentrations of SO42- in the disturbed catchments compared to those undisturbed may promote MeHg formation if the conditions become more reduced further downstream. While most former studies of forest management effects on water quality have focused on forest harvest, our research contributes to the currently rather scarce pool of data on the impact of less-studied management operations, such as ditch cleaning and beaver dam removal, on carbon, nutrient, and MeHg concentrations in runoff water.
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subjects Bacteria
Carbon
Catchments
Cleaning
Dam effects
Dams
Dimethylmercury
Dissolved organic carbon
Disturbance
Disturbances
Downstream effects
drainage ditches
Environmental quality
Eutrophication
Forest harvesting
forest land
Forest management
Forest Science
Forest soils
Forest watersheds
Forestry
Forestry research
Forests
Land use planning
Life Sciences & Biomedicine
Mercury (metal)
Methylmercury
Nutrient concentrations
Nutrient removal
Nutrients
Organic soils
Runoff
Science & Technology
Seasonal variations
Skogsvetenskap
Water quality
Water quality management
title Carbon, Nutrients and Methylmercury in Water from Small Catchments Affected by Various Forest Management Operations
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