Concept to UnderstandMatter, in the form of nutrients, cycleswithin and among ecosystems and in thebiosphere, and human activities arealtering these nutrient cycles.
Nutrient CyclesDriven by solar energy and gravityReservoirs – storage sites where nutrientsaccumulate and remain there for sometimeConnect all organisms through timeNutrient Cycles - Water, Carbon,Nitrogen
Hydrologic (Water) Cycle Water cycle is powered by the sun 1. Evaporation 2. Transpiration - evaporates from plant surfaces 3. Condenses (in atmosphere) 4. Precipitation
Hydrologic Cycle Water vapor in the atmosphere comes from theoceans 84% Over land, ???% of water reaching the atmospherecomes from transpiration 90% Only 0.024% of water is available for human use (toosalty, ice, too deep underground)
Increasedfloodingfrom wetlanddestructionCondensationEvaporationfrom oceanClimatechangeInfiltrationand percolationinto aquiferCondensationOceanLakes andreservoirsIce andsnowSurfacerunoffSurface runoffAquiferdepletion fromoverpumpingPointsourcepollutionReduced recharge ofaquifers and floodingfrom covering landwith crops andbuildingsGroundwatermovement (slow)RunoffPrecipitationto landPrecipitationto oceanTranspirationfrom plantsEvaporationfrom landFig. 3-12, p. 49ProcessesProcesses affected by humansReservoirPathway affected by humansNatural pathway
Carbon Cycle Carbon – basic building block of organic molecules(carbohydrates, fats, protein, DNA) Carbon dioxide (CO2) also controls warming and cooling ofthe Earth.
Carbon Cycle Major cycle processes Photosynthesis – remove from air make sugars Aerobic respiration – release CO2 into air Burning Fossil fuels add CO2 to the atmosphere andcontribute to global warming