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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

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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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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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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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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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Video Experimental Relacionado

Updated: Jul 28, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Descubriendo el ciclo de fósforo de Ediacaran

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.

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Resumen

Los niveles de fósforo oceánico aumentaron durante la excursión Ediacaran Shuram, impulsando el aumento de oxígeno. Esto sugiere factores externos como la intemperie del sulfato, no sólo ciclos internos, la oxigenación controlada del océano Ediacaran.

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Área de la Ciencia:

  • Geoquímica
  • Paleoceanografía
  • Biogeoquímica

Sus antecedentes:

  • El fósforo es un nutriente clave que controla los niveles de oxígeno oceánico.
  • El Período Ediacariano vio aumentos propuestos en el fósforo marino vinculados al aumento del oxígeno.
  • El ciclo del fósforo durante este tiempo crítico sigue siendo poco conocido.

Objetivo del estudio:

  • Reconstruir las concentraciones de fósforo oceánico durante la excursión Ediacaran Shuram (SE).
  • Investigar los impulsores de la oxigenación oceánica durante este período.
  • Comprender la relación entre el fósforo, los isótopos de carbono y los niveles de oxígeno.

Principales métodos:

  • Análisis del fosfato asociado al carbonato (CAP) de seis secciones globales.
  • Reconstrucción de las concentraciones de fósforo oceánico.
  • Aplicación de un modelo biogeoquímico cuantitativo

Principales resultados:

  • Se observaron aumentos pulsantes en las concentraciones de fósforo oceánico durante el SE.
  • El modelo sugiere la liberación de fósforo por la oxidación de la materia orgánica y el desgaste de la tierra.
  • Se encontraron concentraciones equivalentes de fósforo durante diferentes niveles de anoxia en todo el SE.

Conclusiones:

  • Los estímulos externos, como la intemperie de sulfato, probablemente controlaron la oxigenación del océano de Ediacaran.
  • Los ciclos de fósforo y oxígeno pueden haber sido desacoplados, a diferencia del océano moderno.
  • Esto proporciona información sobre el aumento prolongado de los niveles de oxígeno atmosférico.