wetlands. what are wetlands? a wetland is a water resource that has three characteristics: wetland...

WETLANDS

What are wetlands?

A wetland is a water resource that has three characteristics:

•Wetland hydrology•Wetland soils

•Wetland plants

Wetland Hydrology

Water that is present in depths less than 6 ft., or soils are

saturated, for 10 days or more during the growing season for

the prevalent vegetation;

Hydric soils

Soils with physical and chemical characteristics that are associated with lack of oxygen in the soil

Hydric or Wetland Soils Characteristics

• Very dark brown or black colored, or sometimes gray or blue;

• Distinct smell of rotten eggs when you dig in it;

• Can have distinct red or reddish colored spots, called mottles, in it;

• Sometimes a “histic epipedon” or a layer of peat-like material at the surface.

Hydrophytic vegetation

Vegetation uniquely suited for growing in water or saturated soil

conditions

Plants that grow in water have adaptations to get

air to roots • Floating leaves• Hollow stems• Roots that grow above the soil/water

surface• Trees have “buttresses”, i.e., very wide

trunks at the soil/water surface, sometimes with roots sticking out to help the tree stand in mucky soils.

Where are wetlands found?

• Associated with streams and stream margins• Low gradient (flat) valley bottoms• Sideslopes with springs and seeps• Depressions such as roadside drainage ditches• Tidal estuaries and interdunal swales• Almost anywhere there is standing water during late spring

Why are wetlands important?

Wetlands provide homes for wildlife

• Habitat for birds of all types• Refugia for deer and other

mammals• Habitat for fish, salmon and other

types of aquatic life• Habitat for frogs, turtles, newts,

salamanders

Wetlands are valuable so they are protected by law:

The Clean Water Act protects wetlands in all

states, andin Oregon, the Fill and

Removal Law also protects wetlands.

Threats to wetlands

• New development like roads, houses, shopping centers and malls:These activities threaten wetlands by filling them in to make land to build on and by increasing the amount of paved area

• Farming: Farming can drain or destroy existing

wetlands through clearing, plowing, draining, and planting them.

More threats to wetlands:

• Water and land pollution: Industrial wastewater being discharged

into wetlands, land fills and other activities that pollute surface and ground water

• Invasion of wetlands by non-native or pest plants and animals

What will you do to protect our wetlands?