Study Guide for Midterm 2

Study Guide for Midterm 2 - Midterm Study Guide Unit 1...

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Midterm Study Guide Unit 1 Introduction · Know the critical components that define a wetland Soil, Hydrology, Vegetation, growing season, duration of inunda- tion, proximity of saturation/inundation close to surface Hydrology- dictates oxygen availability, biogeochemical cycles, organism selection/sur- vival, temp regulation, etc. · What are major functions and values we attribute to wetlands? -Water Quality (wetlands can act as a long-term storage sink for contaminants removing them from surface water. can be a trans- former of contaminants resulting in different, less toxic com- pounds.) -Water Supply -Habitat (variety and sustainability of wildlife) -Food Web Connections (vegetation provides forage, detrital ma- terial, nursery grounds for fish) -Flood Control -Fisheries -Education -Recreation · What is the difference between value and function? value- g/s wetlands provide fxn- natural processes that exist regardless of their perceived value to society · Understand some of the chronology of wetland losses in the US. -Some of biggest losses -Key issues: tile drainage in Midwest -The impacts from 20’s to 90’s -Alaska hasn’t even lost 1% of wetlands! Unit 2: Hydrology · Understand the terms hydroperiod and hydropattern Hydroperiod- # occurences/year a wetland is flooded. lumps together frequency and dura- tion and not other components of hydrology ex- HPe of 180 days indicates water was standing at that location for 180/365 days of the year, or plant species could tolerate 60 day HPe could withstand flooding 60/365 days Hydropattern- Depth, Duration, Frequency, Timing/Season, Flow · Components, differences, how each component relates to potential stress on vegetation
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Frequency- #times wetland is flooded or under saturated conditions in given time period. Determines dry/wet seasons for cultivation purposes Duration- length of single flooding event. ex- March 3-20, 17 day duration. if plant can- not withstand long periods of flooding, the duration will drown the plant Depth- depth of water in wetland or given point in wetland during flooding event. often based on minimums and maximums. more consistent in treatment wetlands or those adja- cent to control structures. This will affect the water table and which plants can withstand low/high water tables Timing/Season- period of the year flooding is likely to occur. becomes critical when ana- lyzing respiration rate of organism (greater or less than available oxygen can result in hypoxia) temperature is huge component regulating metabolism- time of year of flooding is relative to when an organism would be most active Flow- movement of water. sediment transports, deposition, nutrient limiting conditions · Know what a hydrograph is and terminology associated with it measure of depth or volume over time. Rising limb, Recession limb; storm runoff under- neath peak, base flow determining “surface” each storm event has duration and intensity, each watershed has signature hydrograph for
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Study Guide for Midterm 2 - Midterm Study Guide Unit 1...

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