Peatland

Description

This site is typically an open wetland, with an abundance of broad-leaved sedges and frequent fluctuations in water table depth. High levels of water on-site typically preclude tree establishment, although sometimes tree seedlings of American elm, black ash, and red maple can be present (MN DNR 2003). Trees in the canopy layer are not common and when present have less than 25% cover, the most common occurrence including American elm and black ash (MN DNR 2003). Forbs can be found in all community phases, and can include marsh bellflower, tufted loosestrife, marsh skullcap, great water dock, eastern marsh fern, purple marshlocks, and Epilobium sp. In reference condition, these sites are an important habitat for many songbirds, ruffed grouse, American woodcock and small mammals, and are particularly important winter habitat for ring-necked pheasant, eastern cottontail and white-tailed deer (Eggers 1997).

Dominant plant species

1. American elm (Ulmus americana), tree

2. black ash (Fraxinus nigra), tree

3. marsh bellflower (Campanula aparinoides), grass

4. tufted loosestrife (Lysimachia thyrsiflora), grass

Submodel

Description

The invasive species reed canarygrass and common reed grass have become more abundant in recent decades, resulting in displacement of native vegetation and lowered species diversity on-site. Purple loosestrife is also a common invasive species. Typically, these invasions are the result of proximity to seed source, higher levels of nutrient loading (Nitrogen and Phosphorus) on-site, and human-induced alterations to fluctuations of the water table.

Dominant plant species

1. reed canarygrass (Phalaris arundinacea), grass

2. purple loosestrife (Lythrum salicaria), grass

Submodel

Description

In cases where the water table and hydrology are permanently altered; or altered for prolonged periods of time, there results an overall average lower water table and decrease in water level fluctuations. Due to this lack of water, the site may dry up enough to allow for tree establishment and recruitment. This often occurs when seed sources are available on adjacent landscape positions. American elm and black ash are the most common species to establish in this state (MN DNR 2003).

Dominant plant species

1. American elm (Ulmus americana), tree

2. black ash (Fraxinus nigra), tree

Submodel