生态系统特性和森林衰退在对比的长期时间序列中
David A Wardle1, Lawrence R Walker, Richard D Bardgett
1Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences, SE901 83 Umeå, Sweden. david.wardle@svek.slu.se
概括
森林生态系统最终在长期无干扰的继承后逐渐衰退. 这种下降涉及减少树木大小和增加限制,影响全球森林类型的分解和微生物活动.
科学领域:
- 生态生态学 生态生态学
- 森林科学 森林科学 森林科学
- 生态系统动力学 生态系统动力学
背景情况:
- 生态系统的发展,称为继承,通常导致生物质的增加.
- 然而,由于缺乏干扰,生态系统的长期稳定性可能受到威胁,可能导致衰退阶段.
研究的目的:
- 调查生态系统衰退的特征和流行情况,以及长期森林的继承情况.
- 确定与全球森林生态系统的衰退阶段相关的关键生态指标.
主要方法:
- 在热带,温带和北极森林区域 (澳大利亚,瑞典,阿拉斯加,夏威夷,新西兰) 分析了六个长期时间序列.
- 测量树木基底面积,基板与的比率,垃圾分解率,释放,以及分解器微生物生物质和活性.
主要成果:
- 在所有研究的时间序列中,衰退阶段与树木基底面积减少有关.
- 基质与的比率增加表明随着时间的推移,的限制逐渐减少.
- 垃圾分解,释放和分解器微生物活动的减少伴随着下降.
结论:
- 在森林继承过程中达到的最大生物质在长期没有干扰的情况下是不可持续的.
- 生态系统衰退的可预测模式,以限和减少分解为特征,在全球森林中发生.
相关概念视频
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...
Ecological 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...
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...
Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Survival Tree
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 survival tree begins...
Building a Survival Tree
Constructing a survival tree begins...
Biodeterioration
Biodeterioration refers to the unwanted alteration of materials caused by microorganisms—especially fungi—which damage both organic substrates (paper, wood, textiles) and inorganic ones (stone, plaster, glass). Unlike abiotic decay, biodeterioration results from biological activity that produces physical disruption and chemical degradation.Physical deterioration occurs as fungal hyphae penetrate pores, cracks, and surface irregularities. Hyphal turgor pressure, thigmotropic growth along...


