土壤动物群体组成对草原生态系统模型的影响
M A Bradford1, T H Jones, R D Bardgett
1Natural Environment Research Council Centre for Population Biology, Department of Biological Sciences, Imperial College at Silwood Park, Ascot, SL5 7PY, UK. m.a.bradford@ic.ac.uk
Science (New York, N.Y.)
|October 19, 2002
概括
全球变化影响土壤动物,但生态系统的生产力保持稳定. 不同的土壤动物群落令人惊地没有改变净初级或生态系统的生产力,这表明效应取消.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 生态系统的运作 生态系统的运作
背景情况:
- 全球变化和人类的影响可能会改变土壤动物群落.
- 这些改变对生态系统运作的后果尚不清楚.
- 土壤动物在生态系统过程中发挥着至关重要的作用.
研究的目的:
- 研究土壤动物社区组成的变化如何影响生态系统的功能.
- 为了确定土壤动物体型组合对草原生态系统的影响.
- 评估关键生态系统过程对土壤动植物变化的抵抗力.
主要方法:
- 在Ecotron控制环境设施中建造了草原模型系统.
- 通过组装不同的动物体大小来操纵土壤社区的组成.
- 测量了植物群体的组成,微生物和根生物量,分解速度和菌根殖民.
主要成果:
- 土壤社区组成,微生物生物量,根生物量,分解和菌根植民被动物操纵显著影响.
- 在地面上,净初级生产率 (ANPP) 和净生态系统生产率 (NEP) 显示出对土壤动物群落变化的惊人抵抗力.
- 尽管对土壤属性的影响很大,但整体生态系统的生产率基本保持不变.
结论:
- 改变土壤动物群体的组成可以显著影响土壤特性和微生物群体.
- 像ANPP和NEP这样的关键生态系统过程表现出对土壤动物变化的弹性.
- 假设土壤社区内的积极和消极的动物媒介影响可能会相互抵消,从而对生态系统生产率没有净影响.
更多相关视频
10:31Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments
Published on: July 24, 2018
09:23JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
Published on: March 21, 2025
相关概念视频
01:50Threats 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...
02:17Ecological Succession
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...
02:23The Soil Ecosystem
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
02:11The Roles of Bacteria and Fungi in Plant Nutrition
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
02:26Ecological 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...
01:29Soil Microbial Ecology
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...