相关实验视频
Updated: Sep 9, 2025

08:39
Simulating Temperature in a Soil Incubation Experiment
Published on: October 28, 2022
3.1K
已经适应混合树叶森林中温度上升的土壤和森林地板呼吸
Liliana Scapucci1, Luana Krebs1, Susanne Burri1
1Department of Environmental Systems Sciences, ETH Zürich, Zurich, Switzerland.
概括
森林土壤的呼吸和二氧化碳的交换已经在18年内适应了变暖的温度. 这表明尽管气候变化, 森林仍能保持碳捕获潜力.
科学领域:
- 森林生态
- 气候变化科学
- 生物地化学循环
背景情况:
- 森林生态系统在减轻人为二氧化碳 (CO2) 排放方面发挥着至关重要的作用.
- 土壤和森林地板的呼吸损失可以抵消森林的碳捕获潜力.
- 预计全球气温上升将增加土壤呼吸率,从而可能降低森林减灾能力.
研究的目的:
- 测量18年间混合树叶森林中的土壤呼吸 (SR) 和森林地面净二氧化碳交换 (NEE_ff).
- 使用先进的统计模型确定影响SR和NEE_ff的关键环境驱动因素.
- 评估SR和NEE_ff对气候变化的长期温度敏感性和适应性.
主要方法:
- 采用手动和自动化室,并配合天花板下方的旋转共变系统进行全面的二氧化碳流量测量.
- 使用极端梯度提升模型和沙普利增量解释 (SHAP) 进行驱动分析.
- 在瑞士的复合叶森林中分析了18年研究期间 (2006-2023) 的13年数据.
主要成果:
- 土壤温度升高是SR和NEE_ff的主要驱动因素,解释了50%以上的变化.
- 在2006年至2023年期间的平均年温度下,没有观察到SR或NEE_ff的显著增加.
- 在研究期间,SR和NEE_ff的温度灵敏度没有显著变化.
结论:
- 森林土壤和森林地板呼吸似乎已经适应了更温暖的条件,这表明它们对气候变化具有弹性.
- 这些发现对于改进森林生态系统未来碳减排潜力的预测至关重要.
- 整合多种测量技术与机器学习可以提高对森林生态系统对环境变化的反应的理解.
相关概念视频
Adaptations that Reduce Water Loss
26.3K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
26.3K
Responses to Heat and Cold Stress
13.8K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.8K
Chemical Factors Affecting Respiration Centers
1.3K
Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
CO2 has a potent influence on respiration and is strictly regulated....
1.3K
Positive and Negative Feedback Loops
20.1K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
20.1K
Other Factors Affecting Respiration Centers
968
Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical...
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical...
968
The Calvin Benson Cycle
4.7K
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...
4.7K

