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相关概念视频

Responses to Drought and Flooding02:41

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Burn Injuries01:22

Burn Injuries

Burn injuries occur when the skin and underlying tissues are damaged due to exposure to heat, electricity, chemicals, radiation, or friction. They can vary in severity, from minor superficial burns to severe deep burns that can be life-threatening.
The damage results in the death of skin cells, which can lead to a massive loss of fluid. Dehydration, electrolyte imbalance, and renal and circulatory failure follow, which can be fatal. Burn patients are treated with intravenous fluids to offset...
Ecological Disturbance02:26

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...

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相关实验视频

Updated: Jul 12, 2026

Continuous In-woods Production of Biochar Using a Trailer-Mounted Air Curtain Burner
03:42

Continuous In-woods Production of Biochar Using a Trailer-Mounted Air Curtain Burner

Published on: April 5, 2024

亚马逊热带雨林的火灾正在蔓延.

R L Sanford, J Saldarriaga, K E Clark

    Science (New York, N.Y.)
    |January 4, 1985
    PubMed
    概括

    亚马逊土壤中的木炭表明,自全新世纪中期以来,雨林经常发生火灾. 这些火灾很可能是由气候变化或人类活动引起的,在特定的土壤类型中最为普遍.

    科学领域:

    • * 亚马逊的生态
    • * 古生态环境研究
    • * 土壤科学 土壤科学

    背景情况:

    • * 亚马逊盆地中北部成熟的雨林含有木炭沉积物.
    • *木炭的存在表明该地区有重大火灾事件的历史.
    • *木炭的分布在不同的森林和土壤类型之间有所不同.

    研究的目的:

    • * 调查亚马逊盆地过去雨林火灾的发生和时间.
    • * 为了确定木炭分布和土壤类型之间的关系.
    • * 探索这些历史火灾的潜在原因.

    主要方法:

    • * 在圣卡洛斯德里约内格罗附近的成熟雨林中采集土壤样本.
    • * 在土壤样本中发现的木炭的碳-14测年.
    • *分析木炭分布在Oxisols,Ultisols,caatinga和igapo土壤中的情况.

    主要成果:

    • *木炭在固地森林Oxisols和Ultisols中普遍存在.
    • *碳-14年代测定揭示了自全新世纪中期以来发生的众多火灾.
    • *木炭在caatinga和igapo森林土壤中不太普遍.

    更多相关视频

    Wind Tunnel Experiments to Study Chaparral Crown Fires
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    Wind Tunnel Experiments to Study Chaparral Crown Fires

    Published on: November 14, 2017

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    Continuous In-woods Production of Biochar Using a Trailer-Mounted Air Curtain Burner
    03:42

    Continuous In-woods Production of Biochar Using a Trailer-Mounted Air Curtain Burner

    Published on: April 5, 2024

    Wind Tunnel Experiments to Study Chaparral Crown Fires
    09:27

    Wind Tunnel Experiments to Study Chaparral Crown Fires

    Published on: November 14, 2017

    结论:

    • * 亚马逊盆地在整个全新世纪中期及以后经历了反复发生的雨林火灾.
    • * 火灾频率和分布受土壤类型的影响.
    • * 气候变化和人类活动都是这些历史雨林火灾的可信驱动因素.