对热带森林二次继承中共生二固定的关键作用
Sarah A Batterman1, Lars O Hedin, Michiel van Breugel
1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544, USA. sbatterm@princeton.edu
Nature
|September 17, 2013
概括
热带森林中的固树木显著增加了碳捕获. 这些物种克服了限,使森林恢复和生长速度更快,这对土地碳汇至关重要.
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
- 生物地质化学生物地质化学
背景情况:
- 森林是重要的碳汇,但的可用性往往限制了二氧化碳 (CO2) 捕获.
- 热带森林含有能够固定大气中二 (N2) 的树种,但它们在CO2升高下支持森林恢复和扩张方面的作用尚未完全理解.
研究的目的:
- 调查热带森林生态系统中在树种发展过程中共生 (N2) 固定的作用.
- 确定N2固定树是否可以提供足够的气,以支持快速生物质积累,并克服生态系统规模的限.
主要方法:
- 在巴拿马进行了一项300年时间序列研究,用于比较N2固定和非固定树木物种之间的碳积累率.
- 评估了N2固定的时间和数量的特定物种差异.
- 量化了N2固定对生态系统在森林早期生长过程中所需的贡献.
主要成果:
- 固定二氧化碳的树木比不固定树木每个人积累碳的速度高达9倍,在年轻森林中观察到的最大差异.
- 在最初的12年内,这些"固定物种"提供了森林净增长所需的大部分气 (每公5万公斤).
- 在整个森林年龄序列中存在各种不同的N2固定树种,确保了生态系统的功能多样性.
结论:
- 交生性N2固定在热带森林树发展期间的循环中起着至关重要的作用.
- 这一过程可以有效地克服限,提高热带森林对大气二氧化碳的封存能力.
- 这些发现强调了N2固定树对热带森林弹性及其对全球碳循环的贡献的重要性.
更多相关视频
10:16Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
Published on: January 16, 2014
09:49Prospecting Microbial Strains for Bioremediation and Probiotics Development for Metaorganism Research and Preservation
Published on: October 31, 2019
相关概念视频
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...
02:11The 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.
01:22Inorganic Nitrogen Assimilation
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
01:28Carbon-dioxide Fixation
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
01:49The Nitrogen Cycle
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
02:40Epiphytes, Parasites, and Carnivores
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 biosynthesis of the...