Announcements Kevin and I will hold office hours together today in Girvetz 2307 Kevin and I will...
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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
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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
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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.
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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.
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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
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Biome:
A large climatic region where plants are similar to each other
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What is missing?
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Arctic Tundra:
Short growing season
Intense cold
Strong winds
Permafrost
Low primary productivity
Slow decomposition
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Boreal forest: Cold winters, warm summers
Cone-shaped trees- shed snow
- catch light
Peatlands- slow decomposition
Fire
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Temperate forest: Evergreen and deciduous
Intermediate temperature
Adequate moisture
Few constraints on growth
High primary
productivity
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Grasslands: Continental regions
- hot summer, low rainfall
Fires
Grazing
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Deserts: North and south of tropics
Dry
Hot or cold
Organisms have adapted
to this environment
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Plant adaptation to hot environments:
Physical Structure
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Plant adaptations: Plant adaptations: PhysiologyPhysiology
• Stomata must be open to take in COStomata must be open to take in CO22
• Open stomata = water lossOpen stomata = water loss• How can a plant minimize water loss?How can a plant minimize water loss?
• Keep stomata closed as much as possibleKeep stomata closed as much as possible• Open only at night = CAM plantsOpen only at night = CAM plants
• Cactus, some epiphytes, succulentsCactus, some epiphytes, succulents
• Open only a little bit = COpen only a little bit = C44 plants plants• Some grassesSome grasses
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Which grasslands are likely to be C4?
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Tropical Rainforests
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Tropical rainforests: Near the equator
Hot
Moist conditions
Tight cycling of nutrients- soils are actually quite poor
High primary productivity
Fast decomposition
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Where is Santa Barbara?
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Chaparral or Mediterranean-Chaparral or Mediterranean-typetype
• Strong seasonality Strong seasonality • Hot, dry summersHot, dry summers• Mild, wet winters Mild, wet winters high productivity high productivity
• Fires feed on large fuel supplyFires feed on large fuel supply
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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.
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Summary from MondaySummary from Monday
• Biome= climatic region where the Biome= climatic region where the vegetation is similarvegetation is similar
• Hadley CellsHadley Cells• Terrestrial BiomesTerrestrial Biomes
• Arctic TundraArctic Tundra• Boreal ForestBoreal Forest• Temperate ForestTemperate Forest• GrasslandGrassland• Desert- Desert- physical and physiological adaptations of physical and physiological adaptations of
plantsplants• Tropical RainforestTropical Rainforest• Mediterranean/ChaparralMediterranean/Chaparral
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What is missing?
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Aquatic EcosystemsAquatic Ecosystems
• Streams and RiversStreams and Rivers• LakesLakes• EstuariesEstuaries• Freshwater wetlandsFreshwater wetlands• OceansOceans
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Streams and RiversStreams and Rivers
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Streams and RiversStreams and Rivers
5th order
4th order
3rd order
2nd order
1st order (headwaters
)
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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
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Production vs. Biomass Production vs. Biomass PyramidsPyramids
Primary Producers
Herbivores
Carnivores
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Production vs. Biomass Production vs. Biomass PyramidsPyramids
Primary Producers
Herbivores
Carnivores
Standing Biomass
Primary Producers
Herbivores
Carnivores
Productivity
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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?
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Light Penetration in LakesLight Penetration in Lakes
Secchi disk
Euphotic zone
Aphotic zone
Sediment
eu: well or good a:
without
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Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
HypolimnionSediment
Summer
Thermocline
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Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
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Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Well-mixed profileSediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
Winter
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Thermal Stratification of Thermal Stratification of LakesLakes
Epilimnion
Hypolimnion
Thermocline Sediment
Well-mixed profileSediment
Well-mixed profileSediment
Epilimnion
HypolimnionSediment
(wind)
Summer Fall
WinterSpring
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Thermal Stratification and Thermal Stratification and OxygenOxygen
Well-mixed profile
Sediment
Epilimnion
Hypolimnion
Sediment
Summer
Winter
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Phytoplankton and abiotic factors in a lake
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Oligotrophic vs. Eutrophic Lakes
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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
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Wetland Biogeochemistry
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• 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
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• 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
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• 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
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• 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
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• 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
Wetland BiogeochemistryWetland Biogeochemistry
O2 NO3- Fe(OH)3 MnO2 SO4
2- CO2