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関連する概念動画

The Phosphorus Cycle01:21

The Phosphorus Cycle

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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The Carbon Cycle01:14

The Carbon Cycle

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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 living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
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The Sulfur Cycle01:22

The Sulfur Cycle

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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Primary Production01:06

Primary Production

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Updated: Jul 28, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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エディアカランの循環を明らかにする

Matthew S Dodd1,2,3,4,5, Wei Shi1,3, Chao Li6,7,8

  • 1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China.

Nature
|May 31, 2023
PubMed
まとめ

エディアカラン・シュラムの遠征中に 海洋の濃度が上昇し 酸素が増加した 内部循環だけではなく エディアカランの海洋の酸素化が 制御されていることを示唆しています

さらに関連する動画

Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
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Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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関連する実験動画

Last Updated: Jul 28, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

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Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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科学分野:

  • 地化学
  • 古代海洋学
  • 生地化学

背景:

  • 海洋の酸素レベルを 制御する重要な栄養素です
  • エディアカラン期には,酸素の上昇と関連した海洋リン酸の増加が提案された.
  • この重要な時期におけるの循環は 十分に理解されていない.

研究 の 目的:

  • エディアカラン・シュラム (SE) 遠征の時の海洋リン濃度を再構築する.
  • この時期の海洋酸素化の要因を調査する.
  • リン,炭素同位体,酸素濃度の関係を理解する.

主な方法:

  • 炭酸塩関連フォスファート (CAP) の分析
  • 海洋のリン濃度の再構築
  • 定量的生地化学モデルを適用する.

主要な成果:

  • 海洋のリン濃度の急上昇は,SEの間に観察されました.
  • モデルでは,有機物質の酸化と土地の気象によるの放出を示唆しています.
  • SE全域で異なった無酸素度で同等な濃度が見つかりました.

結論:

  • 硫酸エステーションのような 外部刺激により エディアカラの海洋の酸素化が 制御された可能性が高い
  • 現代の海とは違って リンと酸素の循環が解き放たれたのかもしれません
  • これは大気中の酸素濃度が 長期にわたって上昇していることに 洞察力を与えてくれます