种类的替代和森林的结构,体积和生物质的变化在沙原
Kennedy Nunes Oliveira1, Eder Pereira Miguel1, Matheus Santos Martins1
1Department of Forest Engineering, Federal University of Brasília (UnB), Brasilia 70297-400, DF, Brazil.
Plants (Basel, Switzerland)
|October 16, 2024
概括
塞拉达奥植被动态显示密度增加和生物质积累,转向森林物种. 这表明生态系统仍在发展,尚未达到其全部承载能力.
科学领域:
- 生态生态学 生态生态学
- 林业林业 林业 林业 林业
- 植物学 植物学
背景情况:
- 塞拉达奥的植被研究主要集中在植物和结构方面的研究,对数量和生物质库存动态的数据有限.
- 在Cerradão生态系统中量化植被增长对于理解生态系统功能和管理至关重要.
研究的目的:
- 量化Cerradão植被中的植被动态,包括体积和生物质的增加.
- 评估物种组成和生态系统发展随时间的变化.
主要方法:
- 采用了系统采样,分为细分条带和400平方米的地块.
- 植被密度,体积和地表生物量 (AGB) 用既定的方程进行测量和估计.
- 通过增长率,招聘率,死亡率和营业额率分析了植被动态.
主要成果:
- 树木密度从2012年的1135棵树/公增加到2023年的1229棵树/公.
- 2023年的总体体积和生物质分别为160.91 m3/ha和118.10 Mg/ha.
- 观察到从典型的塞拉多到森林物种的物种组成的转变,其中*Emmotum nitens*,*Mezilaurus itauba*,*Ocotea canaliculata*和*Sacoglottis guianensis*显著增加.
结论:
- 塞拉达奥的植被正在积极生长和积累生物质,这表明它还没有达到承载能力.
- 观察到的变化受到该地区向保护单元的过渡及其位于与亚马逊生物群的过渡区的影响.
- 持续监测对于了解Cerradão生态系统的长期发展和管理战略至关重要.
相关概念视频
02:17Ecological Succession
17.2K
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...
17.2K
00:53Migration
7.9K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
7.9K
02:31Habitat Fragmentation
17.4K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
17.4K
01:50Threats to Biodiversity
22.2K
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...
22.2K
01:07Speciation Rates
21.1K
Overview
21.1K
00:46Trophic Efficiency
20.3K
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
20.3K