生态系统对高CO2水平的反应受到引起的植物物种转移所限制
J Adam Langley1, J Patrick Megonigal
1Smithsonian Environmental Research Center, Edgewater, Maryland 21037, USA.
Nature
|July 3, 2010
概括
的添加最初在高碳二氧化物 (CO2) 的情况下促进了植物的生长,但植物类型的变化后来抑制了湿地生态系统中的这种CO2化效应.
科学领域:
- 生态生态学 生态生态学
- 全球变化生物学
- 生物地质化学生物地质化学
背景情况:
- 陆地生态系统在调节大气中的二氧化碳 (CO2) 中发挥着重要作用,二氧化碳是关键的温室气体.
- 生物圈能够缓冲不断上升的二氧化碳水平并缓解气候变化的能力是不确定的.
- 假设 (N) 的可用性可以限制CO2化对自然生态系统中的植物生产力的影响.
研究的目的:
- 调查高CO2和土壤N可用性对湿地生态系统中的植物生产率和社区组成的相互作用影响.
- 确定人为N输入是否可以在自然环境中维持CO2受精效应.
- 评估植物社区转移作为影响生态系统对全球变化反应的反机制的作用.
主要方法:
- 试验操纵大气中的CO2度和土壤N的可用性在一个盐湿地.
- 多年来监测植物生产率和社区组成.
- 使用植物群体中占主导地位的是C(3) 和C(4) 草,它们以快速的环境反应而闻名.
主要成果:
- 的添加最初在第一年提高了CO2刺激的植物生产率,这表明N限制.
- 添加气促进了C(4) 草的侵占,这些草对升高的CO(2) 的反应较弱.
- 植物社区的转移最终在第三年和第四年抑制了CO2肥对植物整体生产力的影响.
结论:
- 植物群体组成的变化可以作为反,改变生态系统对高碳排放的反应.
- 添加对二氧化碳肥的积极影响可能会被植物群落结构的变化所抵消.
- 植物物种对全球变化因素的反应中的权衡可能会限制自然生态系统的缓冲能力.
更多相关视频
09:02Building and Operating a Low-Cost Elevated Carbon Dioxide Growth Chamber to Evaluate Microgreen Physiology under Spaceflight-Relevant CO2 Levels
Published on: April 17, 2026
09:38Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
相关概念视频
01:46The Calvin Benson Cycle
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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...
01:22Inorganic 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...
01:49The 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...
01:27C4 Pathway and CAM
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.