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21 results on '"Shu, Weixi"'

10. Responses of the Urban Atmospheric Thermal Environment to Two Distinct Heat Waves and Their Changes With Future Urban Expansion in a Chinese Megacity.

Author

Zhao, Yang, Zhong, Lei, Zhou, Keqi, Liu, Bin, and Shu, Weixi

Subjects
URBAN growth, HEAT waves (Meteorology), URBAN heat islands, MEGALOPOLIS, WEATHER, LATENT heat
Abstract

This study investigates the responses of the urban atmospheric thermal environment to two distinct heat waves in Hefei, China, and explores potential changes associated with future urban expansion. During the Event 1, characterized by clear and dry conditions, the western Pacific subtropical high limits water vapor influx, resulting in a significant cooling effect in rural area due to higher surface latent heat flux. The urban heat island (UHI) intensity, calculated using surface temperature and 2‐m temperature, reaches 5.2°C and 1.7°C during the Event 1, respectively. Although Event 2, characterized by cloudy and humid conditions, exhibits weaker UHI and urban dry island effects, it remains highly unfavorable for human comfort. During distinct heat waves, the vertical extent of the warming effect induced by future urban expansion varies, which can be attributed to environmental factors, such as atmospheric stability and near‐surface wind speed. Plain Language Summary: The study investigates the interactions between the urban atmospheric thermal environment and two distinct heat waves in Hefei, China, as well as the changes induced by future urban expansion. During the first event, which has clear and dry weather conditions, the influx of water vapor is limited by a high‐pressure system. Consequently, rural area experiences a significant cooling effect due to higher surface latent heat flux. The urban heat island (UHI) intensity, measured by surface temperature and 2‐m temperature, reaches 5.2°C and 1.7°C, respectively, during this event. In contrast, the second event, characterized by cloudy and humid weather conditions, exhibits weaker UHI and urban dry island effects but remains highly uncomfortable for humans. The vertical extent of the warming effect caused by future urban expansion varies during distinct heat waves. This variation can be attributed to environmental factors, such as atmospheric stability and near‐surface wind speed. Key Points: The underlying mechanisms of the different responses of the urban atmospheric thermal environment to distinct heat wave events are analyzedThe limitation of water vapor influx by a high‐pressure system and intense solar radiation jointly enhance the urban heat island effectAtmospheric stability and wind speed could influence the vertical extent of the warming effect induced by future urban expansion [ABSTRACT FROM AUTHOR]

Published
2024
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15. Effects of Pseudomonas FluorescensFY32 On Canola (Brassica NapusL.) Cultivars Under Drought Stress Induced by Polyethylene Glycol

Author

Kazemi Oskuei, Bita, Bandehagh, Ali, Farajzadeh, Davoud, Asgari Lajayer, Behnam, Shu, Weixi, and Astatkie, Tess

Abstract

Environmental stresses, such as drought, represent the most limiting factors for agricultural productivity. Drought stress has drastic effects on the growth of canola plants. This study investigates the effects of inoculation with Pseudomonas fluorescens FY32 on the growth and antioxidant status of canola cultivars under drought stress induced by polyethylene glycol (PEG). The results show that bacterial inoculation improves the aerial dry weights and root length of canola plants under moderate drought stress. Peroxidase activity, as an antioxidant enzyme, increased in response to drought stress, whereas catalase activity remained constant, and polyphenol oxidase activity decreased. Compared to non-inoculated plants, inoculated plants showed significantly higher activities of antioxidant enzymes under drought stress. The inoculated canola cultivar Hyola308 exhibited a better protection mechanism against drought stress and was more tolerant than other cultivars exposed to drought stress, possibly due to its increased growth parameters and antioxidant enzyme activities. These results suggest that inoculation with the Pseudomonas fluorescens FY32 strain might alleviate the adverse effects of drought stress and lead to less stress pressure on plants.

Published
2024
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20. Effects of Pseudomonas FluorescensFY32 On Canola (Brassica NapusL.) Cultivars Under Drought Stress Induced by Polyethylene Glycol

Author

Kazemi Oskuei, Bita, Bandehagh, Ali, Farajzadeh, Davoud, Asgari Lajayer, Behnam, Shu, Weixi, and Astatkie, Tess

Abstract

Environmental stresses, such as drought, represent the most limiting factors for agricultural productivity. Drought stress has drastic effects on the growth of canola plants. This study investigates the effects of inoculation with Pseudomonas fluorescens FY32 on the growth and antioxidant status of canola cultivars under drought stress induced by polyethylene glycol (PEG). The results show that bacterial inoculation improves the aerial dry weights and root length of canola plants under moderate drought stress. Peroxidase activity, as an antioxidant enzyme, increased in response to drought stress, whereas catalase activity remained constant, and polyphenol oxidase activity decreased. Compared to non-inoculated plants, inoculated plants showed significantly higher activities of antioxidant enzymes under drought stress. The inoculated canola cultivar Hyola308 exhibited a better protection mechanism against drought stress and was more tolerant than other cultivars exposed to drought stress, possibly due to its increased growth parameters and antioxidant enzyme activities. These results suggest that inoculation with the Pseudomonas fluorescens FY32 strain might alleviate the adverse effects of drought stress and lead to less stress pressure on plants.

Published
2023
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