Contrasting Pre-Mei-Yu and Mei-Yu Extreme Precipitation in the Yangtze River Valley: Influencing Systems and Precipitation Mechanisms

Wang, Xiaokang; Dong, Xiquan; Deng, Yi; Cui, Chunguang; Wan, Rong; Cui, Wenjun

doi:10.1175/jhm-d-18-0240.1

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…Compared with temperature that is largely determined by surface energy budget, precipitation is not only affected by regional hydrological cycle but also large‐scale dynamics (Douglas et al., 2009; Woldemichael et al., 2012; Zhao et al., 2014). However, previous studies were mainly focused on the effect of large‐scale dynamics on extreme rainfall in Wuhan (Wang et al., 2019; Zhou et al., 2018), while the landscape‐change‐induced forcing was largely omitted. In this study, we found that water body existence in 2000 led to a contrasting pattern of rainfall changes between rural and urban areas (i.e., summer rainfall increased in rural areas but decreased in urban areas).…”

Section: Discussionmentioning

confidence: 99%

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

et al. 2022

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Wuhan has witnessed unprecedented urban expansion that encroached upon sizable inland lakes. However, the impacts of urban expansion on climate and heat stress for such a city with complex physiographic background (land‐water mosaics) remain understudied. Using a coupled urban‐lake‐atmospheric model, we first examined summer climate responses to urban expansion and lake shrinkage in Wuhan during 2000–2020. Second, multiple heat stress indicators were used to evaluate human thermal comfort in different contexts of interest. Results showed that the presence of water bodies reduced daytime maximum temperature, raised nighttime minimum temperature, and increased moisture content in urban and built‐up areas. Urban expansion alone led to summer warming of 0.9°C and drying of 0.9 g/kg, with local peak warming and drying up to 2°C and 1.4 g/kg. In comparison, urban expansion with lake shrinkage showed a reduced magnitude of warming of 0.8°C and increased magnitude of drying of 1.6 g/kg, with the maximum changes up to 1.4°C and 2.0 g/kg. The presence of water bodies reduced while urban expansion increased the frequency of occurrence of yellow and orange heat alert days; however, both increased the number of days exerting high thermal risks on outdoor workers and those days that were dangerous for outdoor pedestrians. Our study underlined that both urban expansion and water body existence exerted a strong influence on summer climate and heat stress in Wuhan, and highlighted that mitigation measures should be taken to alleviate the deleterious impacts of high temperature and humidity on human health.

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Section: Discussionmentioning

confidence: 99%

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

et al. 2022

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“…This period is called the Meiyu season, which generally starts in early June and ends in mid-July [ 34 ]. The Meiyu season is one of three periods of heavy rainfall in China, and the precipitation during this period is mostly continuous and stable [ 35 ]. The favorable temperature and relatively high humidity during this season encourage the formation of mold and rot not only on fabrics but on wood materials as well.…”

Section: Methodsmentioning

confidence: 99%

Succession of Fungal Community during Outdoor Deterioration of Round Bamboo

An,

Han,

Ren

et al. 2023

JoF

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Bamboo’s mechanical and aesthetic properties are significantly influenced by fungi. However, few studies have been conducted to investigate the structure and dynamics of fungal communities in bamboo during its natural deterioration. In this study, fungal community succession and characteristic variations of round bamboo in roofed and unroofed environments over a period of 13 weeks of deterioration were deciphered using high-throughput sequencing and multiple characterization methods. A total of 459 fungal Operational Taxonomic Units (OTUs) from eight phyla were identified. The fungal community’s richness of roofed bamboo samples showed an increasing trend, whereas that of unroofed bamboo samples presented a declining trend during deterioration. Ascomycota and Basidiomycota were the dominant phyla throughout the deterioration process in two different environments: Basidiomycota was found to be an early colonizer of unroofed bamboo samples. Principal Coordinates Analysis (PCoA) analysis suggested that the deterioration time had a greater impact on fungal community variation compared to the exposure conditions. Redundancy analysis (RDA) further revealed that temperature was a major environmental factor that contributed to the variation in fungal communities. Additionally, the bamboo epidermis presented a descending total amount of cell wall components in both roofed and unroofed conditions. The correlation analysis between the fungal community and relative abundance of three major cell wall components elucidated that Cladosporium was negatively correlated with hemicellulose in roofed samples, whereas they presented a positive correlation with hemicellulose and a negative correlation with lignin in unroofed samples. Furthermore, the contact angle decreased during the deterioration process in the roofed as well as unroofed samples, which could arise from the degradation of lignin. Our findings provide novel insights into the fungal community succession on round bamboo during its natural deterioration and give useful information for round bamboo protection.

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“…Being a typical region in southern China, this district also undergoes a period of rainfall in the middle of each year. The Meiyu season, also known as the rainy period, often starts in early June and ends in mid-July [33], and the precipitation during this period is mostly stable and continuous [34]. The optimal temperature and elevated humidity during this season promote the growth of mold and decay, affecting not only textiles but also wood products.…”

Section: Study Site and Samplingmentioning

confidence: 99%

Temporal Dynamics of Fungal Communities in Alkali-Treated Round Bamboo Deterioration under Natural Weathering

Han,

An,

et al. 2024

Microorganisms

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Microbes naturally inhabit bamboo-based materials in outdoor environments, sequentially contributing to their deterioration. Fungi play a significant role in deterioration, especially in environments with abundant water and favorable temperatures. Alkali treatment is often employed in the pretreatment of round bamboo to change its natural elastic and aesthetic behaviors. However, little research has investigated the structure and dynamics of fungal communities on alkali-treated round bamboo during natural deterioration. In this work, high-throughput sequencing and multiple characterization methods were used to disclose the fungal community succession and characteristic alterations of alkali-treated round bamboo in both roofed and unroofed habitats throughout a 13-week deterioration period. In total, 192 fungal amplicon sequence variants (ASVs) from six phyla were identified. The fungal community richness of roofed bamboo samples declined, whereas that of unroofed bamboo samples increased during deterioration. The phyla Ascomycota and Basidiomycota exhibited dominance during the entire deterioration process in two distinct environments, and the relative abundance of them combined was more than 99%. A distinct shift in fungal communities from Basidiomycota dominant in the early stage to Ascomycota dominant in the late stage was observed, which may be attributed to the increase of moisture and temperature during succession and the effect of alkali treatment. Among all environmental factors, temperature contributed most to the variation in the fungal community. The surface of round bamboo underwent continuous destruction from fungi and environmental factors. The total amount of cell wall components in bamboo epidermis in both roofed and unroofed conditions presented a descending trend. The content of hemicellulose declined sharply by 8.3% and 11.1% under roofed and unroofed environments after 9 weeks of deterioration. In addition, the contact angle was reduced throughout the deterioration process in both roofed and unroofed samples, which might be attributed to wax layer removal and lignin degradation. This study provides theoretical support for the protection of round bamboo under natural weathering.

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Contrasting Pre-Mei-Yu and Mei-Yu Extreme Precipitation in the Yangtze River Valley: Influencing Systems and Precipitation Mechanisms

Cited by 13 publications

References 26 publications

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

Succession of Fungal Community during Outdoor Deterioration of Round Bamboo

Temporal Dynamics of Fungal Communities in Alkali-Treated Round Bamboo Deterioration under Natural Weathering

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