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相关概念视频

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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Ecological Succession02:17

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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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Threats to Biodiversity01:50

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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...
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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.
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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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相关实验视频

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JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
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奇异的侵入性植物物种增加了初级生产力,但不是在它们的原生范围.

Ragan M Callaway1, Robert W Pal2, Adrian Schaar3

  • 1Division of Biological Sciences, University of Montana, Missoula, Montana, USA.

Ecology letters
|August 4, 2025
PubMed
概括
此摘要是机器生成的。

奇特的入侵植物在它们的非原生范围中显著提高了生态系统的生产力,而不仅仅是被动地殖民更丰富的环境. 这种入侵效应推动了更高的生物质,挑战了关于植物竞争和生态系统功能的先前假设.

关键词:
在地面上,初级生产率净值.生物地质和生物地理学共同的花园 共同的花园异国情调的异国情调是什么这是入侵的入侵.土壤肥沃度 土壤肥沃度土壤气是土壤中的气.

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科学领域:

  • 生态生态学 生态生态学
  • 侵入性物种 生物学 生物学
  • 植物生态学植物生态学

背景情况:

  • 生态系统的净初级生产率 (NPP) 通常受到非生物因素的限制.
  • 外来入侵植物经常与生态系统生产率的提高有关.
  • 之前的研究缺乏实验证据来区分入侵效应与特定物种的特征或地点选择.

研究的目的:

  • 确定外来入侵植物是否积极推动生态系统生产率的提高,或者它们是否仅仅是更富有生产力的环境中的乘客.
  • 为了区分入侵本身的影响与固有的物种生产力或微站点殖民优势.

主要方法:

  • 在地面上测量了五种植物物种的生物质,它们的本地和非本地范围.
  • 实地研究和普通花园实验进行,以控制环境变量.
  • 进行了对本地与非本地范围生物质的比较分析.

主要成果:

  • 外来入侵者在实地研究中增加了91%,在非原生范围内的普通花园中增加了107%.
  • 这些提高生产力的效应在研究物种的原生范围中明显较小或不存在.
  • 当被引入新环境时,观察到的生产率增加在物种之间是一致的.

结论:

  • 外来入侵植物是生态系统生产率增加的重要驱动因素,特别是在它们的非原生范围.
  • 增强的生产力是入侵过程本身的结果,不仅仅是由于该物种固有的特征或它们对已经生产的地点的殖民.
  • 了解这种入侵驱动的生产力背后的机制对于预测生态系统对生物入侵的反应至关重要.