Presentation is loading. Please wait.

Presentation is loading. Please wait.

Ecological Cycles Nitrogen, Carbon-Oxygen, Phosphorus, Sulfur.

Similar presentations

Presentation on theme: "Ecological Cycles Nitrogen, Carbon-Oxygen, Phosphorus, Sulfur."— Presentation transcript:

1 Ecological Cycles Nitrogen, Carbon-Oxygen, Phosphorus, Sulfur

2 The Nitrogen cycle

3 The Nitrogen Cycle Nitrogen is used by living organisms to produce a number of complex organic molecules like amino acids, proteins, and nucleic acids.organicamino acidsproteins nucleic acids 78% of the worlds atmosphere is nitrogen Despite its abundance in the atmosphere, nitrogen is often the most limiting nutrient for plant growth. This problem occurs because most plants can only take up nitrogen in two solid forms: ammonium ion (NH4+ ) and the ion nitrate (NO3- ) and CONNOT use raw atmospheric nitrogenammoniumnitrate

4 Four processes participate in the cycling of nitrogen through the biosphere: nitrogen fixation atmospheric fixation by lightning biological fixation by certain microbes industrial fixation – making ammonia decay (ammonification) – bacteria convert dead matter and wastes into ammonia nitrification – bacteria convert ammonia into nitrates and nitrites denitrification – bacteria return nitrogen to the atmosphere

5 Human Influence on Nitrogen Cycle artificial nitrogen fertilization planting of nitrogen fixing crops N 2 O has risen in the atmosphere as a result of agricultural fertilization, biomass burning, cattle and feedlots, and other industrial sources (N 2 O also destroys ozone) eutrophication


7 Water Cycle

8 Water Cycle – Mans Influence Tropical Rain Forest – deforestation Less trees = less tramsiration = less water in atmosphere = less rain Olalla Reservoir Huge groundwater store in central U.S. Being depleted faster than replenished

9 Carbon Cycle

10 O.03 carbon dioxide in atmosphere Plants take in CO 2 and release O 2 in PHOTOSYNTHEIS Animals take in O 2 and release CO 2 in CELLULAR RESPIRATION Decay also release CO 2 into the atmosphere

11 Mans Influence on Carbon Cycle Burning fossil fuels releases CO 2 into atmosphere Cellulose in dead plant material is hard to breakdown (too big) Accumulates undecomposed over time forming peat Peat over time and under pressure forms fossil fuels When fossil fuels are burned – releases carbon

12 Sulfur Cycle Sulfur Component of proteins Component of vitamins Most sulfur is in rock and mineral slats Released naturally into atmosphere from volcanoes and decomposition in wetlands In atmosphere, SO2 reacts with water to produce sulfuric acid


14 Mans Influence We release excess SO 2 into the atmosphere by: Burning fossil fuels Refining petroleum products Mining processes

15 Chemosynthesis Ocean vents in trenches Bacteria use hydrogen sulfide H 2 S as energy source

16 Phosphorus Cycle Phosphorus important in DNA molecules ATP Cell membranes Bones Teeth shells

17 Slow cycle Not much in atmosphere – but in soil, rock, and water Big water component

18 Phosphorus Cycle

Download ppt "Ecological Cycles Nitrogen, Carbon-Oxygen, Phosphorus, Sulfur."

Similar presentations

Ads by Google