阴性植物-土壤反预测了热带森林中树种相对丰富的情况
Scott A Mangan1, Stefan A Schnitzer, Edward A Herre
1Department of Biological Sciences, University of Wisconsin-Milwaukee, Wisconsin 53201, USA. smangan37@gmail.com
Nature
|June 29, 2010
概括
土壤生物创造了负面的植物-土壤反,保持了热带森林的多样性. 这一由特定物种的敌人驱动的过程影响着树木的繁多和社区的组成.
科学领域:
- 生态生态学 生态生态学
- 植物生物学 植物生物学
- 森林科学 森林科学 森林科学
背景情况:
- 植物多样性对于生态系统的稳定至关重要.
- 据假设,物种特异性敌人通过限制同物种种苗的招募来维持多样性.
- 之前的研究缺乏明确的敌人类别驱动负面反和他们的社区层面的影响.
研究的目的:
- 为了测试同类树苗的性能是否被成年树的敌人降低.
- 为了确定敌对类别 (土壤生物 vs. 地表生物) 调解负面植物-土壤反.
- 确定负面反是否影响热带森林社区组成.
主要方法:
- 进行了相互的影子屋和实地实验.
- 在存在成年人相关敌人的情况下,同种类与异种类幼苗的性能进行了比较.
- 模拟模型被用来评估测量反对社区范围丰富模式的影响.
主要成果:
- 发现了强有力的证据,证明了由土壤生物介导的植物-土壤负面反.
- 地上的敌人 (哺乳动物,草食动物,病原体) 对负面反的贡献很小.
- 具有较强负面反的树种在成年后的数量较少,这表明土壤生物群对土壤生物群的相对丰富性有影响.
结论:
- 土壤生物介导的负面植物-土壤反是维持热带森林物种多样性的关键机制.
- 对土壤生物群的敏感性可以决定这些生态系统中物种的相对丰度.
- 当地的负面反足以解释观察到的社区范围内的树种丰度模式.
相关概念视频
Threats to Biodiversity
21.9K
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...
21.9K
Ecological Niches
22.4K
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
22.4K
Ecological Succession
19.2K
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...
19.2K
The Roles of Bacteria and Fungi in Plant Nutrition
36.7K
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.
36.7K
Survival Tree
514
Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
Building a Survival Tree
Constructing a...
Building a Survival Tree
Constructing a...
514
Soil Microbial Ecology
89
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...
89


