Name: nitrogen in soil and living things
Uploaded: 2019-03-11T09:21:40.000Z
Duration: 1 min 49 s
Channel: JoVE

K12 Standards

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NC K-12 Science Standard Course of Study

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Ecosystems- Interactions, Energy, and Dynamics

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The Nitrogen Cycle

Азотный цикл включает в себя перемещение атомов азота между биотическими и абиотическими компонентами экосистемы. Большая часть азота в экосистеме хранится в атмосфере как газ N2, но только бактерии обладают необходимыми ферментами для преобразования газообразного азота в пригодную для использования другими организмами форму, этот феномен называется фиксацией азота. Поэтому азот очень ограниченное питательное вещество в экосистеме.Как только бактерии в почве преобразуют газ в аммиак, растения могут начать конвертировать азот в белки, ДНК и другие органические молекулы, которые потребляются травоядными и расщепляются на аминокислоты. Их можно собрать повторно в белки, используемые для роста и развития, и питания потребителей. Одновременно, травоядные и потребители возвращают некоторое количество азота в почву в виде отходов.Как мёртвые организмы, так и продукты отходов содержат азот в виде белка, урии, и мочевой кислоты. Разлагающие организмы, такие как бактерии и грибы, могут расщепить эти молекулы, высвобождая аммиак обратно в почву, где он может быть поглощён растениями или преобразован в нитраты нитрифицирующими бактериями. Эти нитраты также могут быть поглощены растениями, или, при отсутствии кислорода, преобразованы в газообразный азот, уничтожающий бактерии.Люди также вводят азот экосистему через использование сельскохозяйственных удобрений. Однако, при использовании в неподходящее время, или в больших количествах, избыток азота может вытекать в водные экосистемы и увеличивать рост бактерий, водорослей и водных растений, в процессе, называемом эвтрофикацией.

Рамакришнан В.В., Гали А.Е. "Источники азота и круговорот в экосистеме и его роль в загрязнении воздуха, воды и почвы: критический обзор." Журнал воздействия и контроля загрязнения 03, No2 (2015). [<a href="https://doi.org/10.4172/2375-4397.1000136" target="__blank">Источник</a>]

Азотный цикл

Атомы азота, присутствующие во всех белках и ДНК, рециклируются между абиотическими и биотическими компонентами экосистемы. Однако основной формой азота на Земле является газообразный азот, который не может использоваться большинством животных и растений. Таким образом, газообразный азот должен сначала быть преобразован в пригодную для использования форму азотфиксирующими бактериями, прежде чем он сможет пройти через другие живые организмы. Использование азотсодержащих удобрений и отходов животноводства в сельском хозяйстве человека сильно повлияло на естественный круговорот азота. 

<h4> Биологический цикл азота </h4>

 Около 78% воздуха, которым мы дышим, состоит из азота. Однако в этой форме, N 2 , немногие организмы могут ее использовать. Азот входит в состав важных молекул во всех организмах, такие как белки и ДНК. Не имея возможности использовать атмосферный азот, большинство организмов использует побочные продукты азотфиксирующих и нитрифицирующих прокариот. Фиксация азота превращает газообразный азот (N 2 ) в аммиак (NH 3 ), тогда как нитрификация превращает NH 3 в нитриты (NO 2 - ) и нитраты (NO 3 - ). Растения могут напрямую использовать аммиак и нитраты, а растительноядные организмы получают азот, поедая растения. Когда эти организмы умирают, бактерии в почве могут преобразовывать органический азот в аммиак в процессе, называемом аммификацией. Затем посредством денитрификации аэробные бактерии могут преобразовывать аммиак в газообразный азот, который возвращается в атмосферу, завершая цикл. 

<h4> Азотные jnkj;tybz </h4>

 Основным резервуаром для длительного хранения азота является атмосферный азот. Однако в экосистеме есть и другие, более мелкие поглотители азота. Азот может быть связан в течение относительно длительного периода времени в болотах, морских отложениях и осадочных породах. Однако, поскольку соединения азота хорошо растворяются в воде, выветривание осадочных пород может высвободить азот обратно в экосистему. 

<h4> Влияние человека на цикл азота </h4>

 Поскольку азот часто является ограничивающим фактором для роста растений в естественной среде, фермеры добавляют азот в почву в качестве удобрения для увеличения урожайности. Сток сельскохозяйственных культур в водные экосистемы может привести к эвтрофикации и неестественно быстрому росту токсичных видов водорослей. Разведение большого количества домашнего скота также может увеличить количество азотных отходов в почве и местных источниках воды.

Атомы азота, присутствующие во всех белках и ДНК, циркулируют между абиотическими и биотическими компонентами экосистемы. Однако первичная форма ...

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nitrogen in soil and living things

Nitrogen in soil and living things moves through ecosystems in several forms. Nitrogen atoms are found in proteins and DNA. Most animals and plants cannot use nitrogen gas, which is the main form of nitrogen on Earth. Nitrogen must first be changed into a usable form by nitrogen-fixing bacteria before it can move through food webs.

About 78% of the air we breathe is nitrogen gas, but few organisms can use it in that form. Nitrogen fixation changes nitrogen gas (N2) into ammonia (NH3). Nitrification then changes ammonia into nitrites (NO2-) and nitrates (NO3-). Plants can use ammonia and nitrates directly. Plant-eating organisms get nitrogen by eating plants.

When organisms die, soil bacteria break down organic nitrogen and convert it into ammonia. This process is called ammonification. Aerobic bacteria can then carry out denitrification and convert ammonia into nitrogen gas that returns to the atmosphere. That return of nitrogen gas completes the cycle.

The main long-term reservoir for nitrogen is nitrogen gas in the atmosphere. Smaller nitrogen sinks also store nitrogen for long periods. These include swamps, marine sediments, and sedimentary rock. Because nitrogen compounds dissolve easily in water, weathering of sedimentary rock can release nitrogen back into the ecosystem.

Human activity can change the nitrogen cycle. Farmers add nitrogen to soil as fertilizer because nitrogen is often a limiting factor for plant growth in natural environments. This can increase agricultural yield. However, runoff from farms can enter aquatic ecosystems and cause eutrophication, which leads to unnaturally rapid growth of toxic algae species. Large numbers of livestock can also increase the amount of nitric waste in soil and local water sources.

Nitrogen in Soil and Living Things

what is an ecosystem?

Ecosystem Zones and Climate

Ecosystems are shaped by living and nonliving parts of an environment, and they can be grouped as terrestrial or aquatic. Terrestrial ecosystems depend on climate. Aquatic ecosystems are divided into freshwater and marine systems, and depth affects water temperature and how much sunlight reaches the water. Terrestrial ecosystems are called biomes. A biome is defined by climate and by the organisms that live there. Near the equator, rainforests have high, aseasonal temperatures and high annual...

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Food chains show how energy and nutrients move through an ecosystem. Each organism holds a trophic level, or a specific place in that chain. The lowest level includes primary producers, which make their own food using energy from the sun or from chemicals. Organisms at the next levels are heterotrophs, which get energy from other organisms below them. Primary consumers are herbivores, and they feed on autotrophs, also called primary producers. Secondary and tertiary consumers are carnivores...

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Gross primary production and net primary production describe how energy enters and moves through ecosystems. Primary producers, or autotrophs, make their own food. They can do this by photosynthesis or chemosynthesis, and they can also gain energy by consuming other organisms. The rate at which producers capture and store this energy is called gross primary production, or GPP. Not all of the energy in GPP stays available to the rest of the ecosystem. Primary producers use some energy for...

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Energy Transfer as Biomass Efficiency

Net production efficiency shows how much energy organisms turn into biomass for the next trophic level. It focuses on the usable energy stored in body tissue, not the energy lost as heat or excreted wastes. This makes it a key idea for understanding energy flow through ecosystems. As energy moves from one organism to the next, only biomass can serve as food for the next trophic level. The rest of the energy is used in metabolism and is lost over time. Net production efficiency, or NPE, is the...

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Trophic level transfer efficiency describes how much energy moves from one level of a food chain to the next. It shows why energy drops sharply as organisms eat and are eaten. In most ecosystems, only about 10% of the energy passes on. This energy loss follows the second law of thermodynamics. In living systems, much of the energy is lost as metabolic heat during respiration. Trophic level transfer efficiency, or TLTE, measures this transfer by comparing the energy produced at one trophic...

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Nutrient Recycling in Ecosystems

Nutrient recycling in ecosystems keeps the elements needed for life moving through living and nonliving parts of the environment. Elements such as water, carbon, nitrogen, sulfur, and phosphorus are present in limited amounts, so they must be conserved and reused. These movements are called biogeochemical cycles. These nutrients can exist in several chemical forms. They may spend long periods in the atmosphere, on land, under the land, or in aquatic environments. Decomposition is a key part of...

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Water Movement Through Earth Systems

Water movement through Earth systems connects the hydrosphere, the atmosphere, the land, and living things. The hydrosphere includes every place where water is stored or moves. Because water supports living processes, its movement is important for ecosystem dynamics. The cycle starts when the sun warms surface water on land and in the oceans. That water evaporates and enters the atmosphere as vapor. Water can also move into the air by sublimation, which is ice changing directly into vapor, and...

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Carbon Movement in Living Systems

Carbon moves through living systems and Earth over short and long time scales. It is the basis of all organic matter on Earth, and it cycles through ecosystems by passing between organisms and by moving through rocks, oceans, and the atmosphere. Human activities, including farming and burning fossil fuels, have changed this balance. In the biological carbon cycle, carbon dioxide in the atmosphere reacts with water to form bicarbonate. Primary producers, or autotrophs, use carbon dioxide and...

the nitrogen cycle

Nitrogen in soil and living things moves through ecosystems in several forms. Nitrogen atoms are found in proteins and DNA. Most animals and plants cannot use nitrogen gas, which is the main form of nitrogen on Earth. Nitrogen must first be changed into a usable form by nitrogen-fixing bacteria before it can move through food webs. About 78% of the air we breathe is nitrogen gas, but few organisms can use it in that form. Nitrogen fixation changes nitrogen gas (N2) into ammonia (NH3).

the phosphorus cycle

Phosphorus Movement in Soil and Water

Phosphorus moves through ecosystems mostly as phosphate ions in soil, water, sediment, and rocks. Unlike carbon, water, and nitrogen, it is not found in the atmosphere as a gas. It is also often a limiting nutrient, which means it is in short supply in many environments. Phosphorus is important in DNA, cell membranes, bones, and teeth. It is found in minerals, sediment, volcanic ash, and aerosols. As rocks and sediment weather over time, they release inorganic phosphate. That phosphate then...

the sulfur cycle

Sulfur in Ecosystems and Acid Rain

Sulfur moves through ecosystems as part of the chemical cycle that supports life. It is an important element in proteins and in amino acids such as cysteine, which helps give proteins their structure. On land, sulfur reaches ecosystems in several ways. Weak sulfuric acid can fall with precipitation, sulfur can drop directly from the atmosphere, rocks can weather and release sulfur, and geothermal vents can add it as well. Plants and microorganisms take sulfur up from the soil and change it...

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Bioremediation in Soil and Oil Cleanup

Bioremediation uses prokaryotes, fungi, or plants to remove pollutants from the environment. It is a practical way to reduce harmful chemicals in contaminated soil and water. In agriculture, fertilizers and pesticides can leach into groundwater, streams, and lakes. Microbes and bacteria can help break down these toxins. One example is atrazine, an environmental toxin found in many fertilizers, which can be removed from soils by the bacterial species Rhizobium and Tricoderma sp. Bioremediation...

key terms and concepts

Follow nitrogen as it moves from air to soil, plants, and animals, and see how bacteria, fertilizers, and runoff shape the cycle in ecosystems.

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What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited ...

The Water Cycle

The Earth&rsquo;s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, ...

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among ...

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of ...

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LS.Bio.5.2

Analyze the relationships between matter and energy within ecosystems.

Nitrogen in Soil and Living Things

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