WHY DO WE NEED NITROGEN?? Nitrogen is needed to make up DNA and protein!
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- Noreen Randall
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1 Nitrogen Cycle 2.2
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3 WHY DO WE NEED NITROGEN?? Nitrogen is needed to make up DNA and protein! In animals, proteins are vital for muscle function. In plants, nitrogen is important for growth.
4 NITROGEN Nitrogen stores Largest store = atmosphere (N 2 ) Also stored in oceans and organic matter, like the soil Much smaller amounts
5 Nitrogen Cycling 78% of the planet s Nitrogen is N 2 (atmosphere) but most organisms cannot use this form. There are 3 main ways that nitrogen is made available to plants/ animals... Nitrogen Fixation - Rhizobium Nitrification Uptake
6 Nitrogen Fixation This is a process that changes N 2 into forms that plants can use! (nitrate) (ammonium) Happens in atmosphere... LIGHTNING! Happens in soil, and in water bodies
7 Lightning provides the energy for nitrogen to react with oxygen in the atmosphere!
8 Nitrogen-fixing bacteria in the soil can convert ( fix ) N 2 to ammonium. In the soil Nitrogen-fixing cyanobacteria in water can also do this! In the water Rhizobium Usually live on roots of legumes and other plants.
9 Nitrogen fixing Bacteria In the soil are an example of Symbiosis These bacteria grow on the root nodules of legumes like peas. The plants provide sugars, while bacteria provide nitrogen ions.
10 Cyanobacteria They are blue-green bacteria that manufacture their own food during photosynthesis These nitrogen-fixing cyanobacteria make these nitrogen compounds available to plants in the surface of oceans, wetlands and lakes
11 Nitrification and Uptake In the soil, nitrifying bacteria convert NH4+ in two steps: NH4+ NO2- NO3- Nitrate can be taken up by plant roots! (Uptake) So, plants that don t live with nitrogen fixing bacteria, can also get nitrogen from the soil.
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13 The Nitrogen Cycle How does Nitrogen then get back into the atmosphere? By the process of denitrfication! Denitrification is the process of changing: NO 3- back to N 2 This occurs in aquatic and land ecosystems by denitrifying bacteria
14 Excess nitrogen dissolves in water, enters the waterways, and washes into lakes and oceans. The nitrogen compounds eventually become trapped in sedimentary rocks and will not be released again until the rocks undergo hundreds of years of weathering.
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17 The Nitrogen Cycle
18 Human Activities and Nitrogen Cycle Human activities can also affect the nitrogen cycle. Due to human activities, the amount of nitrogen in the ecosystem has doubled in the last 50 years. Burning fossil fuels and treating sewage releases nitrogen oxide (NO) and nitrogen dioxide (NO 2 ). Burning also releases nitrogen compounds that increase acid precipitation in the form of nitric acid (HNO 3 ). Acid rain damaged these trees
19 Agricultural Practices Agricultural practices often use large amounts of nitrogen-containing fertilizers. Excess nitrogen is washed away, or leaches, into the waterways. This promotes huge growth in aquatic algae called algae blooms. Algae blooms use up all CO 2 and O 2 and block sunlight, killing many aquatic organisms. Algae blooms can also produce neurotoxins that poison animals.
20 Agricultural Practices Eutrophication is the process by which excess nutrients result in increased plant production and decay
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22 Phosphorus Cycle
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24 The Phosphorus Cycle Phosphorus is essential for life processes in plants and animals. Phosphorus is a part of the molecule that carries energy in living cells = ATP (cellular respiration)!!
25 The Phosphorus Cycle How do plants and animals use phosphorus? Plants Developing healthy seeds, root growth, and stem strength! Animals (humans) Developing healthy bones (works with Ca to build bone tissue) Corn with a Phosphorus deficiency
26 Where do we find P? It is not stored as a gas in the atmosphere like C and N... P is stored in phosphate rock and sediments on the ocean floors (Phosphates: PO 4 3-, HPO 4 2-, and H 2 PO 4- )
27 How it gets from rock soil Phosphorus is released from rock into the soil by a process called weathering CHEMICAL -Acid rain - Chemical in lichens PHYSICAL -Wind, rain, freezing Weathering = rock breaks down into smaller pieces. These pieces make their way into the soil.
28 The Land Cycle Plants take up phosphate through their roots Animals eat the plants (get phosphate) Decomposers return it to the soil
29 The Aquatic Cycle Phosphate gets into the water by erosion, leaching, run-off Most settles at the bottom (turns into sediment) Some phosphate is taken up by aquatic plants
30 Geological Uplift Mountains and hills are created when rock gets uplifted The earth s crust folds (very slowly) and deeply buried rock layers rise up Mt. Everest is made of limestone that must have originally formed on ancient sea floor. It contains fossils of marine creatures.
31 This is a rock in Scotland. Below the yellow line was once horizontal rock. It has been uplifted over time. It has now started to erode due to weathering.
32 Human Activity & the P Cycle We affect the P cycle by: Mining phosphate rock (for fertilizers and detergents) Making fertilizers and detergents (industrial waste) Applying fertilizer to land Fishing (remove aquatic organisms small effect)
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34 How Changes in Nutrient Cycles Affect Biodiversity Any significant changes to any of these nutrients (C, H, O, N, or P) can greatly affect biodiversity. Carbon cycle changes contribute to climate change and global warming. Slight temperature fluctuations and changes in water levels can drastically change ecosystems. Changes influence other organism in the food webs.
35 How Changes in Nutrient Cycles Affect Biodiversity Increased levels of nitrogen can allow certain plant species to outcompete other species, decreasing resources for every species in the food webs. Decreased levels of phosphorus can inhibit the growth of algae that are very important producers in many food chains.
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