Wetlands are effective – on average the removal efficiency is 40%.

A widely used method for reducing the input of nutrients into freshwater and marine environments is to allow contributing water to pass through a created or restored wetland. Mistra EviEM has assessed the evidence and concluded that this intervention generally works well. The variation between wetlands is however large, and to obtain significant effects it is important to carefully consider where and how the wetland is constructed.

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Reviews

The elk (Alces alces) is one of the most important browsers in Swedish forests. Photo: Anna Fuster/Creative Commons.

SR13 Forest grazing

Review of how changes of the grazing and browsing pressure by game and livestock affect forest plants and invertebrates.

Girdled spruce trees. Photo: Göran Eriksson / Länsstyrelsen i Jämtland.

SR12 Dead wood

EviEM examines the consequences for diversity of three kinds of manipulation: creation of dead wood, addition of dead wood from elsewhere, and prescribed burning.

Foto: iStock

SR11 Time series data

Farming practices can affect the amount of carbon stored in soil. EviEM is reviewing time series data about farmland management methods affect soil organic carbon.

Photo: iStock

SR10 Tillage and soil carbon

Farming practices can affect the amount of carbon stored in soil. EviEM is reviewing how reduced tillage intensity affects soil organic carbon.