test 3 notes

test 3 notes - Friday Ecosystem collection of living...

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2/26/10 Friday Ecosystem- collection of living organisms and their physical environment o System- all parts are interrelated o Can occur at different scales ( small localized, or huge) Photosynthesis ** Combines H2O and C02 in series of reactions to fix solar energy as carbohydrates o Gives off oxygen Stoma ( stomata)- C02 enters in the leaves Water enters in the roots and moves up Fundamental process for all living organisms Respiration Oxidation of carbohydrates to give metabolic energy o Oxidizing- generating energy o Carbohydrate combines with 02—energy to cells o By-products: C02 and H20 and heat o Happens at cellular level o Dissipates energy as heat Transpiration - evaporation of water from the stomata out o Conversion of liquid to vapor water Water Transport Water transport stops if: o Stomata closes ( if plant is too dry Pulls water in through the roots when stomata closes o Leaves drop off the plant ( openings through which transpiration would occur is no longer there) Primary Productivity Gross primary productivity ( GPP)-Rate at which sunlight is converted to chemical energy Net primary productivity (NPP)- rate of accumulation of biomass per unit time NPP= GPP- Respiration ( use of energy to live( expenses)
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Nitrogen Cycle- environmental compartments that contain energy focused specifically on a form that plants cant take up to one that they can. N needs to be mineralized( gaseous nitrogen has to be converted to a form they can take up) b/c they cant take up nitrogen WAYS of converting: o Lightning o Decomposition o Nitrogen Fixing Bacteria 3/1/10 Factors influencing Vegetation Tropic level- organisms that obtain energy in the same number of steps from the producers o RSP ( respiration) – with every transfer o Input to decomposers at every level o Limit to the number of levels Climate Light Water Temperature Substrate -Geologic material that plants grow in – o supply of nutrients in the soil basalt vs. Beach sand or sandstone o soil texture—available water capacity Topography elevation o temperature decreases with elevation o rainfall increases with elevation- orographic effects slope steepness o steeper slopes—drier slope aspect- direction that the slope faces o north facing slopes are cooler and moister than south facing slope biotic influences – other plants and animals Time since disturbance
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Vegetation Classification Longevity o Annual ( lifespan is less than a year) o Perennial-lives season to season for many many years Stature/woodiness o Herbs ( non-woody, low in stature) o Shrubs-woody plant and branches from the base o Trees-woody plant that doesn’t typically branch from the base Leave form and persistence o Form: needle leaf vs. broadleaf There is broadleaf evergreens for exeptions and deciduous needle leafs o Persistence: deciduous vs evergreen Deciduous drop leaves on seasonal basis Deciduous and broadleaf usually go together
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test 3 notes - Friday Ecosystem collection of living...

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