Related Experiment Video
Updated: May 30, 2026
07:12
Façade-Level Monitoring of CO2 Variability under Urban Heat Island Conditions using Low-Cost Sensor Data Loggers
Published on: December 12, 2025
[Relationships between urban green belt structure and temperature-humidity effect]
Chun-Yang Zhu1, Shu-Hua Li, Peng Ji
1Laboratory of Landscape Ecology and Green Space Planning, College of Agriculture and Biotechnology, China Agricultural University, Beijing 100193, China. chun82006@sina.com
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|August 5, 2011
Summary
Urban green belts significantly impact temperature and humidity. Tree-shrub-herbage and tree-herbage structures, with canopy densities over 44%, offer the most substantial cooling and humidifying effects in Beijing.
Area of Science:
- Urban ecology
- Environmental science
- Atmospheric science
Background:
- Urban green belts are crucial for mitigating heat island effects.
- Understanding the structural impact of green belts on microclimate is essential for urban planning.
Purpose of the Study:
- To investigate the relationship between urban green belt structure and temperature-humidity effects.
- To quantify the impact of different green belt compositions and canopy densities on local climate in Beijing.
Main Methods:
- Quantitative measurements were conducted on four green belts with varying internal constitutions and five with different canopy densities.
- A 42-meter wide urban green belt along Beijing's West Fourth Ring Road was selected as the study area.
- Comparative analysis with control areas was performed to assess the microclimatic effects.
Main Results:
- Lawn areas showed no significant effect on air temperature or relative humidity.
- Shrub-herbage, tree-shrub-herbage, and tree-herbage green belts demonstrated significant temperature-humidity regulation.
- A canopy density of 10%-31% showed a definite effect, which became significant at 44% and stable above 67%.
Conclusions:
- The structural composition and canopy density of urban green belts are key factors in their microclimatic influence.
- Tree-based green belts with higher canopy densities are more effective in reducing temperature and increasing humidity.
- Optimizing green belt design, particularly canopy density, can enhance their environmental benefits in urban areas.
Related Concept Videos
02:45Responses to Heat and Cold Stress
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.
01:28Factors Affecting Body Temperature
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may include:
Factors may include:
02:11Effects of Temperature on Free Energy
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
02:44Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
01:11Temperature and Thermal Equilibrium
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.