Announcements Announcements • Kevin and I will hold office Kevin and I will hold office hours together today in Girvetz hours together today in Girvetz 2307 2307 • Michael Pollan article to read Michael Pollan article to read for section this week for section this week
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Announcements Kevin and I will hold office hours together today in Girvetz 2307 Kevin and I will hold office hours together today in Girvetz 2307 Michael.
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AnnouncementsAnnouncements
• Kevin and I will hold office hours Kevin and I will hold office hours together today in Girvetz 2307together today in Girvetz 2307
• Michael Pollan article to read for Michael Pollan article to read for section this weeksection this week
Summary from FridaySummary from Friday
• Definition of soilDefinition of soil• Soil developmentSoil development
• additions, losses, transformations, and additions, losses, transformations, and translocationstranslocations
• Classification of soilClassification of soil• 12 different orders12 different orders
• Factors of soil formation: Factors of soil formation: Cl.O.R.P.T.H.Cl.O.R.P.T.H.• BiomesBiomes
• function of temperature and moisturefunction of temperature and moisture
Two-Minute QuizTwo-Minute QuizDuring your spring break you decide to During your spring break you decide to take a road trip through 18 states in 7 take a road trip through 18 states in 7 days. Early one morning in the middle days. Early one morning in the middle of the week you wake up and realize of the week you wake up and realize that you can’t remember where you that you can’t remember where you are.are.
You step outside to investigate your You step outside to investigate your surroundings, and notice a lovely road surroundings, and notice a lovely road cut where the soil profile is visible from cut where the soil profile is visible from “O” horizon to bedrock.“O” horizon to bedrock.
Here are your Here are your observations:observations:
• The soil is dark red and The soil is dark red and clayey.clayey.
• The profile is deep.The profile is deep.• There are rolling hills, There are rolling hills,
but no sharp peaks in but no sharp peaks in the distancethe distance
• The temperature is 65° The temperature is 65° F.F.
• The air is humid, and The air is humid, and the vegetation is lush. the vegetation is lush.
Where are you?Where are you?
a)a) upstate New Yorkupstate New York
b)b) near Ames, Iowanear Ames, Iowa
c)c) down a backcountry road in Georgiadown a backcountry road in Georgia
d)d) along the coast of Mainealong the coast of Maine
e)e) near the border of New Mexico in near the border of New Mexico in ArizonaArizona
Biome:
A large climatic region where plants are similar to each other
• Fires feed on large fuel supplyFires feed on large fuel supply
AnnouncementsAnnouncements
• I will be gone on Friday – Theresa and I will be gone on Friday – Theresa and Kevin will be giving presentationsKevin will be giving presentations
• Read the Michael Pollan article for Read the Michael Pollan article for section. It is now available online too. section. It is now available online too.
Summary from MondaySummary from Monday
• Biome= climatic region where the Biome= climatic region where the vegetation is similarvegetation is similar
• Streams and RiversStreams and Rivers• LakesLakes• EstuariesEstuaries• Freshwater wetlandsFreshwater wetlands• OceansOceans
Streams and RiversStreams and Rivers
Streams and RiversStreams and Rivers
5th order
4th order
3rd order
2nd order
1st order (headwaters
)
How do large and small streams How do large and small streams differ?differ?
• Low stream order (i.e., 1Low stream order (i.e., 1stst or 2 or 2ndnd order) order)• Small, narrow, shallowSmall, narrow, shallow• Steep, fast-flowing rocky bottomSteep, fast-flowing rocky bottom• Detritivore community breaks down litterDetritivore community breaks down litter
• High stream order (i.e., 4High stream order (i.e., 4thth or 5 or 5thth order) order)• Big, wide, deepBig, wide, deep• Shallow slope, slow flowingShallow slope, slow flowing• Processed litter comes from upstreamProcessed litter comes from upstream
Production vs. Biomass Production vs. Biomass PyramidsPyramids
Primary Producers
Herbivores
Carnivores
Production vs. Biomass Production vs. Biomass PyramidsPyramids
Primary Producers
Herbivores
Carnivores
Standing Biomass
Primary Producers
Herbivores
Carnivores
Productivity
Production vs. Biomass Production vs. Biomass PyramidsPyramids
Primary Producers
Herbivores
Carnivores
Standing Biomass
Primary Producers
Herbivores
Carnivores
Productivity
How do these pyramids differ in terrestrial vs. aquatic ecosystems?
Light Penetration in LakesLight Penetration in Lakes
Secchi disk
Euphotic zone
Aphotic zone
Sediment
eu: well or good a:
without
Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
HypolimnionSediment
Summer
Thermocline
Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Well-mixed profileSediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
Winter
Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Well-mixed profileSediment
Well-mixed profileSediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
WinterSpring
Thermal Stratification and Thermal Stratification and OxygenOxygen
Well-mixed profile
Sediment
Epilimnion
Hypolimnion
Sediment
Summer
Winter
Phytoplankton and abiotic factors in a lake
Oligotrophic vs. Eutrophic Lakes
Wetlands: where water meets Wetlands: where water meets landland
All wetlands are All wetlands are ecotonesecotones
• Salt marshes: costal, brackishSalt marshes: costal, brackish• Swamps: wooded, fresh waterSwamps: wooded, fresh water• Fens: external water and nutrient Fens: external water and nutrient
inputsinputs• dominated by sedgesdominated by sedges
• Bogs: little external nutrient input Bogs: little external nutrient input • dominated by sphagnum mossdominated by sphagnum moss
Wetland Biogeochemistry
• When land is flooded, OWhen land is flooded, O22 gets used up by gets used up by decomposers and the soil becomes decomposers and the soil becomes anaerobicanaerobic
Wetland BiogeochemistryWetland Biogeochemistry
• When land is flooded, OWhen land is flooded, O22 gets used up by gets used up by decomposers and the soil becomes decomposers and the soil becomes anaerobicanaerobic
• Demand for ODemand for O22 is still high is still high
Wetland BiogeochemistryWetland Biogeochemistry
• When land is flooded, OWhen land is flooded, O22 gets used up by gets used up by decomposers and the soil becomes decomposers and the soil becomes anaerobicanaerobic
• Demand for ODemand for O22 is still high is still high• Other minerals containing oxygen get Other minerals containing oxygen get
reducedreduced
Wetland BiogeochemistryWetland Biogeochemistry
• When land is flooded, OWhen land is flooded, O22 gets used up by gets used up by decomposers and the soil becomes decomposers and the soil becomes anaerobicanaerobic
• Demand for ODemand for O22 is still high is still high• Other minerals containing oxygen get Other minerals containing oxygen get
reducedreduced• Reduction is when a compound gains an Reduction is when a compound gains an
electron- in this case by giving up an Oelectron- in this case by giving up an O22 atom atom
• Some molecules release OSome molecules release O22 more easily than more easily than othersothers
Wetland BiogeochemistryWetland Biogeochemistry
O2 NO3- Fe(OH)3 MnO2 SO4
2- CO2
• When land is flooded, OWhen land is flooded, O22 gets used up by gets used up by decomposers and the soil becomes decomposers and the soil becomes anaerobicanaerobic
• Demand for ODemand for O22 is still high is still high• Other minerals containing oxygen get Other minerals containing oxygen get reducedreduced
• Reduction is when a compound gains an electron- in Reduction is when a compound gains an electron- in this case by giving up an Othis case by giving up an O22 atom atom
• Some molecules release OSome molecules release O22 more easily than others more easily than others
• If the water level drops, OIf the water level drops, O22 enters the soil again, enters the soil again, and the reduced substances can get and the reduced substances can get oxidizedoxidized