相关实验视频
Updated: Jan 23, 2026

09:39
Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
Published on: November 18, 2019
6.3K
表面氧气的空间与时间变化及其在温带和亚热带浅湖中的代谢后果
Peifang Leng1, Feng Zhao2, Yindong Tong3
1Shandong Yucheng Agro-ecosystem National Observation and Research Station, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China.
Water research
|January 21, 2026
概括
浅湖氧气 (O2) 监测必须考虑水平变化. 忽视O2水平的空间差异会导致估计湖泊代谢和碳循环的重大错误.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 临界技术 临界技术
背景情况:
- 浅湖是影响全球碳循环的关键生态化学热点.
- 表面氧气 (O2) 动态对于新陈代谢活动和二氧化碳流量估计至关重要,但在不同尺度上对其了解甚微.
- 现有的研究往往忽视了水平O2异质性,专注于时间和垂直变化.
研究的目的:
- 调查横向空间和时间O2变异对整个湖的估计的影响.
- 在浅湖O2动态中量化单站采样引入的错误.
- 了解不同空间和时间尺度上O2异质性的环境驱动因素.
主要方法:
- 在2021年期间,从两个大型浅湖 (Hulun湖和Taihu湖) 收集了高频,多站点表面O2监测数据.
- 划分水平的空间和时间O2变异,以评估采样代表性.
- 分析了空间,季节性和日常尺度上对O2动态的环境控制.
主要成果:
- 单个地点采样错误估计了全湖O2度高达29%,代谢率高达147%.
- 季节性变化是O2动态的主要驱动因素 (34-35%的误差),而每天的变化贡献了13-20%的不确定性.
- 空间O2异质性与生态系统呼吸和藻类梯度,温度和代谢周期的季节性变化以及生产-呼吸相互作用的日常波动有关.
结论:
- 横向的O2异质性显著扭曲了全湖的代谢估计,需要在生态系统模型中整合空间数据.
- 高分辨率的时空监测对于准确的湖泊代谢和碳流量估计至关重要.
- 有针对性的季节性采样策略是必不可少的,以减少浅湖生物地质化学评估中的不确定性,特别是在气候变化下.
相关概念视频
Timing and Consequences on Behavior
367
In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective.
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
367
What is Metabolism?
131.3K
Overview
131.3K
Variability: Analysis
460
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
The range is a simple measure of variability, indicating the difference between the highest and...
460
Random Variables
17.5K
A random variable is a single numerical value that indicates the outcome of a procedure. The concept of random variables is fundamental to the probability theory and was introduced by a Russian mathematician, Pafnuty Chebyshev, in the mid-nineteenth century.
Uppercase letters such as X or Y denote a random variable. Lowercase letters like x or y denote the value of a random variable. If X is a random variable, then X is written in words, and x is given as a number.
For example, let X = the...
Uppercase letters such as X or Y denote a random variable. Lowercase letters like x or y denote the value of a random variable. If X is a random variable, then X is written in words, and x is given as a number.
For example, let X = the...
17.5K
Variables Affecting Phosphorescence and Fluorescence
1.3K
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
1.3K
Work and Energy for Variable Forces
5.7K
When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
5.7K

