Cooling and humidifying effect of plant communities in subtropical urban parks

Zhang, Zhe; Lv, Yingmin; Pan, Huitang

doi:10.1016/j.ufug.2013.03.010

Cited by 135 publications

(86 citation statements)

References 22 publications

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“…2). Previous studies have shown the importance of forest scale and structure on microclimate regulation functions of urban forests (Zhang et al 2013). The environmental benefits provided by urban trees has been assessed analyzing tree dendrometric variables (stem diameter, height, and crown width) at different ages (Marziliano et al 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Wang et al (2015) reported that the cooling effect of trees in clear and hot days was twice as higher than in cloudy and cold days. Zhang et al (2013) demonstrated that canopy density, canopy area, tree height and solar radiation had a significant influence on temperature reduction and relative humidity increase.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, temperature and humidity in forests have proven to be closely related to tree cover and canopy density (Greene & Millward 2017, Zhou et al 2005. Zhang et al (2013) revealed the canopy density, crown size, tree height and radiation significantly influence cooling and humidifying effects. Tall tree species had stronger ability to regulate air temperature (Berry et al 2013).…”

Section: Microclimate Regulation Of Urban Forests In Chinamentioning

confidence: 99%

“…Urban forests management will greatly benefit from better understanding the relationships between microclimate regulation functions, urban forest structure, and local environmental conditions (Zhang et al 2013, Wang et al 2017b. Recent studies have demonstrated that higher trees have a better regulation capacity in terms of sunlight interception, air temperature and humidity (Giannico et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Microclimate regulating functions of urban forests in Changchun City (north-east China) and their associations with different factors

Wang¹,

Wang²,

Lu³

et al. 2018

iForest

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Microclimate regulating functions of urban trees and their associations with environmental factors and tree-growth characteristics are important for management and ecological evaluations. In this study, a total of 637 trees distributed in the Changchun urban region (ca. 400 km 2 , northeastern China) were sampled in four different types of urban forests (AF: affiliated forests; RF: roadside forests; LF: landscape and relaxation forests; EF: ecological welfare forests). Tree growth-related parameters and environmental factors (inside and outside the forest) were simultaneously measured, and location-dependent differences in shading, cooling and humidifying effects were assessed, along with their associations with the measured variables. We found that urban forests in Changchun reduced the incident sunlight by 74-86% and increased air relative humidity by 3-7%, on average. Air, soil, and upper-canopy temperatures were decreased approximately by 3 °C, <1 °C and 1 °C, respectively, showing a 3-dimensional cooling effect of urban forests on both air and soil. Shading, cooling and humidifying effects significantly differed among the four forest types, with AF stands showing the highest comprehensive scores for all the microclimate regulation functions. Regression analyses and redundancy analysis revealed that urban forests had much stronger effect in terms of microclimate regulation at sunny days with high temperature, and low air humidity. In general, stands with larger trees showed the higher regulating functions, regardless of the stand structure and composition. The results of this study may help urban forest management and planning aimed at maximizing their ecological services.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Microclimate Regulation Of Urban Forests In Chinamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microclimate regulating functions of urban forests in Changchun City (north-east China) and their associations with different factors

Wang¹,

Wang²,

Lu³

et al. 2018

iForest

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“…Ketterer & Matzarakis (2014) found urban heat increasing temperature 0.3 K and 2 K and may be up to 12 K in the city concrete; 1.5 -3.0 o C per 100 years; building cooling energy use by Sun & Augenbroe (2014); 1 o C to 5 o C from air conditioning units by Coseo & Larsen (2014); and average monthly 2.6 o C in urban heat island by Shahidan et al (2012). There were a lot of research reports concerning with decreasing air temperature in heat island areas by either growing green patch or storage water ponds on which Skoulika et al (2014) found nocturnal cool islands varying 0.7 K to 2.8 K and daytime 0.2 K to 2.6 K from ambient temperature lower than 34 o C, surface temperature decreasing 1.3 °C and also for every 10% increase in green area from the study of Coseo and Larsen (2014); 2.14 o C to 5.15 o C together with increasing relative humidity 6.21 % to 8.30 % by Zhang et al (2013), 0.1 K to 0.33 K per roof albedo increase by Santamouris (2014).…”

mentioning

confidence: 89%

Lag Time of Heat Conduction in Conditions of Growing Greenery Cover on Flattop-Concrete Roof of Single-Room House with Lightweight-Concrete Walls as Constructed on Narrow Space in Bangkok

Suwansumrit¹,

Chunkao²,

Bualert³

et al. 2015

MAS

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Growing greenery cover on flattop-concrete roof of single-room house with lightweight-concrete walls for lagging heat conduction was experimented during 10 August-30 November 2014 at Kasetsart University on narrow space between the College of Environment and car park buildings which emphasized on minimum room size of 2.5 m width, 2.5 m length, and 2.5 m height as declared by Building Control Act 1990. The methods of study were conducted by installing air thermometers at distance from the house and one meter above ground in northerly, southerly, easterly, westerly and flattop-concrete roof by alternating closing and opening the door and window. The research results found the maximum room temperature ranging 34.5-35.5 o C and minimum 26.5-27.7 o C for closing door and closing window, then decreasing almost being equal from degree of opening door and window, and clearly changing in conditions of long duration, high intensity, and often frequency of rainfall. Using Pudsaon or Cape Jasmine (Gardenia jasminoides J.Ellis) as grown in experimental pots containing coconut flake due to its characteristics of more consuming phreatophyte with high rate of using water for evapotranspiration process that can absorb surrounding heat through converting process to become latent heat flux. In consequence, room temperature was lowered down to 24.5 o C and following by decreasing lag time from 2 hours to 0.5 hours, and also different lag time from 1-2 hours to 0.5-1.5 hours which were indicated better comfortable living. Closing both door and window or either one could not be conditioned for everyday lifestyle of people in dense and populated Bangkok city. In addition, construction of single-room house with flattop-concrete roof and lightweight-concrete walls were surely eligible to protect heat transferring from hot air outside into room rather than from room to outside, except opening both door and window at the same time

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Location matters: planting urban trees in the right places improves cooling

Wang

Zhou

Jiao

2022

Frontiers in Ecol & Environ

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Available space and other resources associated with urban greening initiatives are limited, yet demand for urban cooling to mitigate high urban temperatures is growing. Consequently, identifying the best locations for urban greening to maximize the cooling effects of the urban tree canopy (UTC) is taking on new urgency. We present a cross‐city comparison and show how cooling efficiency (CE) varies spatially within a city. CE tends to be higher in locations with less UTC due in part to evapotranspiration from non‐uniformly distributed trees, but results from a subtropical city included within our comparison underscore the strong effect of a city’s background climate on CE. Mapping the spatial variation of CE can guide tree planting to enhance the cooling effects of UTC, expand the role trees play in urban adaptation to local warming, and help achieve urban sustainability.

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Cooling and humidifying effect of plant communities in subtropical urban parks

Cited by 135 publications

References 22 publications

Microclimate regulating functions of urban forests in Changchun City (north-east China) and their associations with different factors

Microclimate regulating functions of urban forests in Changchun City (north-east China) and their associations with different factors

Lag Time of Heat Conduction in Conditions of Growing Greenery Cover on Flattop-Concrete Roof of Single-Room House with Lightweight-Concrete Walls as Constructed on Narrow Space in Bangkok

Location matters: planting urban trees in the right places improves cooling

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