Most importantly, nitrogen is one of the most important elements because it is the base of the food web and it is involved in a fundamental cycle. Free nitrogen in the air is absorbed by plants and converted to plant proteins. It is then eaten by animals that convert it to animal proteins and return it to the soil as nitrogen waste. Then bacterial action causes the nitrogen compounds to become free nitrogen again. Thus, plants need nitrogen to survive, the animals need the plant proteins to survive, and we in turn need animals and plants to survive.
TABLE OF CONTENTS Introduction Nitrogen is essential to all living systems, which makes the nitrogen cycle one of Earth's most important nutrient cycles. Atoms of nitrogen don't just stay in one place. They move slowly between living things, dead things, the air, soil and water. These movements are called the nitrogen cycle. The nitrogen cycle is one of the biogeochemical cycles and is very important for ecosystems.
Phosphates are present in many natural waters, such as lakes and streams. Phosphates are essential to aquatic plant growth, but too much phosphate can lead to the growth of algae and results in an algae bloom. Too much algae can cause a decrease in the amount in dissolved oxygen in the water. Oxygen in water is affected in many different ways by phosphates Phosphorus is usually present in natural waters as phosphate(Mcwelsh and Raintree, 1998). Phosphates are present in fertilizers and laundry detergents and can enter the water from agricultural runoff, industrial waste, and sewage discharge (Outwater,1996) .
Nitrogen is released from microbial decay in the form of ammonium, but can also be immobilized by microbes which take up nitrate and ammonium to satisfy their own requirements. The mobilization or immobilization of nitrogen is dependent upon the amount of N the decomposing material itself provides; insufficient nitrogen released from decaying organic matter will result in the absorption of ammonium and nitrate by the microbes. An excess of N will satisfy the requirements of the microbes and provide a surplus to be released into the soil... ... middle of paper ... ...6-100. Campbell, C.A., V.O. Biederbeck, and F.G. Warder.
Types of Biogeochemical Cycle Biogeochemical cycle is crucial for every living organism on Earth. It is strongly influenced by life forms, especially plants and microorganisms. A biogeochemical cycle can be defined as a continuous pathway by which conversion and circulation of chemical nutrients through both biotic and abiotic compartments of Earth (Butcher, 1992). Generally, biogeochemical cycles can be classified into three major categories which are nitrogen cycle, sulfur cycle and carbon cycle (Refer to Figure 1 in Appendix 1). First type of biogeochemical cycle is nitrogen cycle.
The Nitrogen Cycle is the Most Important Biogeochemical Cycle The nitrogen cycle is an important cycle to the atmosphere. Nitrogen is an essential part of the biological molecules such as proteins and nucleic acid, which makes nitrogen essential for all living organisms. Nitrogen makes up 78 percent of the atmosphere. There are five steps in the nitrogen cycle between the abiotic environment and the organisms: nitrogen fixation, nitrification, assimilation, ammonification, and dentrification. Nitrogen fixation is the conversion of gaseous nitrogen to ammonia.
They use this and the sunlight's energy to make food. Animals get it by eating the plants or eating other animals that have eaten those plants. During cell respiration oxygen and food both provide energy. Respiration makes carbon dioxide which is then put out into the atmosphere. But there is too much carbon dioxide in the atmosphere and there needs to be a solution to reduce it.
Dependence of Animals on Plants • Animals directly or indirectly depend on plants for their food. Herbivores, plant eating animals directly depend on trees, shrubs, fruits, leaves, and grass for feeding themselves. However, carnivores, ... ... middle of paper ... ...i. Bacteria and fungi are called Decomposers because they break up (decompose) the dead animals or plants that turn the dead matter into material that will be used by the producers and the cycle begins again. Decomposers get rid of all of the organic (natural) garbage that humans, animals and plants produce. They eat, digest, munch and generally reuse all of the dead plants and animals that are on the Earth.
In natural ecosystems, plants obtain their nitrogen from nitrogen fixing bacteria in the soil. Dinitrogen gas (N2) in the atmosphere can be used by soil microorganisms and converted into forms that can be used by plants, either symbiotically or non-symbiotically. Leguminous plants that contain Rhizoium bacteria may fix enough N2 to meet almost 80% of the plants nitrogen needs. The nitrogen cycle represents one of the most important nutrient cycles found in terrestrial ecosystems. Nitrogen is used by living organisms to produce a number of complex organic molecules like amino acids, proteins, and nucleic acids.