beibu gulf
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2022 ◽  
Vol 504 ◽  
pp. 119855
Author(s):  
Chuqi Long ◽  
Zhijun Dai ◽  
Riming Wang ◽  
Yaying Lou ◽  
Xiaoyan Zhou ◽  
...  
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2021 ◽  
Author(s):  
Tianhui Tao ◽  
Yishao Shi ◽  
Katabarwa Murenzi Gilbert ◽  
Xinyi Liu

Abstract The "comparative attitude" of urban agglomerations (UAs) involves multidimensional perspectives such as infrastructure, ecological protection, and air pollution. Based on monitoring station data, comparative studies of multispatial, multitime scale and multiemission pollution sources of air quality on 19 urban agglomerations (UAs) during the 13th Five-Year Plan period in China were explored by mathematical statistics. The comparison results are all visualized and show that clean air days gradually increased and occurred mainly in summer, especially in South and Southwest China. PM2.5, PM10 and O3 were still the main primary pollutants. PM2.5 is mainly concentrated in December, January and February, and PM10 is mainly concentrated in October-November and March-April. The O3 pollution in the Pearl River Delta and Beibu Gulf UA located in the south is mainly concentrated from August to November, which is different from others from May to September. Second, the hourly O3 concentration rates were significantly higher than the particulate matter (PM) pollution rates from 2015 to 2019. Diurnal trends in O3 concentration in all directions also showed a single peak, with the largest increments that appeared between 13:00 and 16:00, while the spatial distribution of this peak was significantly regional, earlier in the east but later in the west. Third, this analysis indicated that the annual average air quality index (AQI) showed a gradually decreasing trend outward, taking the Central Plains UA as the center. Furthermore, the total amount of PM2.5 pollution caused by anthropogenic sources is approximately 2.5 times that of PM10, and industries are the main sources of PM2.5, PM10 and VOCs (volatile organic compounds). VOCs and NOX increased in half of the urban agglomerations, which are the reasons for the increase in ozone pollution. The outcomes of this study will provide targeted insights on pollution prevention in urban agglomerations in the future.


Author(s):  
Jin-Xiu Wang ◽  
Fan-Zhou Kong ◽  
Hui-Xia Geng ◽  
Yue Zhao ◽  
Wei-Bing Guan ◽  
...  

The giant colony-forming haptophyte Phaeocystis globosa has caused several large-scale blooms in the Beibu Gulf since 2011, but the distribution and dynamics of the blooms remained largely unknown. In this study, colonies of P. globosa , as well as membrane-concentrated phytoplankton samples, were collected during eight cruises from September 2016 to August 2017 in the Beibu Gulf. Pigments were analyzed by high performance liquid chromatography coupled with a diode-array detector (HPLC-DAD). The pigment 19'-hexanoyloxyfucoxanthin (hex-fuco), generally considered as a diagnostic pigment for Phaeocystis , was not detected in P. globosa colonies in Beibu Gulf, whereas 19'-butanoyloxyfucoxanthin (but-fuco) was found in all colony samples. Moreover, but-fuco in membrane-concentrated phytoplankton samples exhibited a similar distribution pattern to that of P. globosa colonies, suggesting that but-fuco provided the diagnostic pigment for bloom-forming P. globosa in the Beibu Gulf. Based on the distribution of but-fuco in different water masses in the region prior to the formation of intensive blooms, it’s suggested that P. globosa blooms in the Beibu Gulf could originate from two different sources. IMPORTANCE Phaeocystis globosa has formed intensive blooms in the South China Sea and even around the world, causing huge social economic losses and environmental damage. However, little is known about the formation mechanism and dynamics of P. globosa blooms. 19'-hexanoyloxyfucoxanthin (hex-fuco) is often used as the pigment proxy to estimate Phaeocystis biomass, while this is challenged by the giant colony-forming P. globosa in the Beibu Gulf which only containing 19'-butanoyloxyfucoxanthin (but-fuco) but not hex-fuco. Using but-fuco as a diagnostic pigment, we traced two different origins of P. globosa bloom in Beibu Gulf. This study clarified the development process of P. globosa blooms in the Beibu Gulf, which provided a basis for the early monitoring and prevention of the bloom.


2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Lu Zhang ◽  
Dong Zhao ◽  
Siheng Li ◽  
Han Xiao ◽  
Jianjun Bu ◽  
...  

In order to study the driving force of China’s rapid economic development in the past ten years, the study takes Guizhou, Yunnan, and Guangxi as a case study, focusing on the big data assets exchange (GBDEx) and Beibu Gulf Economic Zone, and discusses the impact of Internet plus economic and government data and the big data system on regional economy. Finally, it is believed that the Internet and big data fully avoid the disadvantages of traffic distance between the western region and the eastern region, make full and efficient cooperation between enterprises and institutions in the central and western regions and Chinese and foreign economic entities, and strengthen the control of economic behavior from the big data level with the support of the service-oriented government. The information entropy output from the Internet big data system has led to a significant entropy reduction process in China’s economic environment and a more orderly economic system, which is also an important reason for the rapid development of China’s economy.


2021 ◽  
Vol 9 (12) ◽  
pp. 91-103
Author(s):  
Haiying Feng ◽  
Jingji Wu ◽  
Victor R. Squires

This paper is in three main parts. Firstly, we summarize key features of the history of trade relationships between the People’s Republic of China (PRC) and the Association of South East Asian countries (ASEAN). This includes a brief examination of the different visions held by ASEAN and PRC and the implications for the various trade partners. In the second part we turn our focus to the Guangxi Zhuang Autonomous Region (GAZR) that is on the shores of the South China Sea and a key region being developed as the Beibu Gulf Economic Rim. The port city of Qinzhou is the nearest deep-water port to the ASEAN countries like Malaysia, Vietnam, Philippines etc and lies at the eastern end of the Southern Transport Corridor (STC) that links Lanzhou on the Yellow River in NW China, to the coast. Finally, we present a cameo on Qinzhou’s Free Trade Port Areas and their role in the ASEAN–China Free Trade Agreement (ACFTA).


Author(s):  
Zhe Li ◽  
Wenjin Hu ◽  
Shushi Huang ◽  
Yuanlin Huang ◽  
Fei Li ◽  
...  

A Gram-stain-negative, aerobic, milky white bacterium, designated B2012T, was isolated from mangrove sediment collected at Beibu Gulf, South China Sea. Antimicrobial activity assay revealed that the isolate possesses the capability of producing antibacterial compounds. Strain B2012T shared the highest 16S rRNA gene sequence relatedness (96.9–95.5 %) with members of the genus Acuticoccus . The isolate and all known Acuticoccus species contain Q-10 as the main respiratory quinone and have the same polar lipid components (phosphatidylcholine, unidentified glycolipid, unidentified lipid, unidentified amino lipid and phosphatidylglycerol). However, genomic relatedness referred by values of average nucleotide identity, digital DNA–DNA hybridization, average amino acid identity and the percentage of conserved proteins between strain B2012T and other type strains of the genus Acuticoccus were below the proposed thresholds for species discrimination. The genome of strain B2012T was assembled into 65 scaffolds with an N50 size of 244239 bp, resulting in a 5.5 Mb genome size. Eight secondary metabolite biosynthetic gene clusters were detected in this genome, including three non-ribosomal peptide biosynthetic loci encoding yet unknown natural products. Strain B2012T displayed moderately halophilic and alkaliphilic properties, growing optimally at 2–3 % (w/v) NaCl concentration and at pH 8–9. The major cellular fatty acids (>10 %) were anteiso-C15 : 0, C16 : 0 dimethyl aldehyde (DMA) and C16 : 0. Combined data from phenotypic, genotypic and chemotaxonomic analyses suggested that strain B2012T represents a novel species of the genus Acuticoccus , for which the name Acuticoccus mangrovi sp. nov. is proposed. The type strain of the type species is B2012T (=MCCC 1K04418T=KCTC 72962T).


2021 ◽  
Author(s):  
Wu Fei ◽  
Yongling He ◽  
Xinqing Yu ◽  
Mengtian Song ◽  
Haoyu Pan

2021 ◽  
pp. 1-14
Author(s):  
XU SHI ◽  
XIAOBO XIAO ◽  
XINYI ZHAO ◽  
RENJIE SUN ◽  
XINGFENG ZHAO ◽  
...  

Summary South-west China, particularly between the Himalayas and the Beibu Gulf, constitutes an important corridor for migratory raptors along the East-Asian continental flyway. However, a lack of ornithological assessment and the common practice of illegal hunting in this region emphasize the need for research and conservation actions. To investigate the ecology of migration and scale of persecution, we launched one of the first citizen-science projects in mainland China to record southward-migrating raptors and hunting gunshots from 2015 to 2019 on Guantouling, a well-known raptor site in South-west China. A total of 42,891 raptors were recorded, belonging to 30 diurnal raptor species. Grey-faced Buzzard Butastur indicus, Oriental Honey Buzzard Pernis ptilorhynchus and Amur Falcon Falco amurensis were the three most abundant species recorded. The bulk of Grey-faced Buzzard and Amur Falcon migrated through Guantouling from mid-October till early November, while Oriental Honey Buzzard migrated throughout October and early November. Precipitation slowed down migration significantly while increasing cloud cover was favoured by the three most abundant species. We found hunting mostly occurred in the afternoon, coinciding with an increasing number of Oriental Honey Buzzard, which may become a major victim of hunting. It is thus suggested to prioritize peak raptor migration period for law enforcement actions, especially on cloudy days and after passage of cold fronts, when Oriental Honey Buzzards and other species are likely to migrate. The annual counting scheme on Guantouling is not only an ecological survey, but also an effective way of engaging the public to counter raptor persecution.


PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12337
Author(s):  
Yuting Feng ◽  
Haiyi Shi ◽  
Gang Hou ◽  
Hui Zhao ◽  
Changming Dong

The jack mackerel (Trachurus japonicus) is both a dominant pelagic fish species and an important fishing target in the Beibu Gulf, South China Sea. However, the resource status of this species fluctuates dramatically, and it has recently been added to a “red list” of threatened species of the International Union for Conservation of Nature (IUCN). Despite its economic importance and decreasing population status, limited research on its spatiotemporal distribution has been undertaken over the last decades. In order to evaluate the most crucial factors that influence the spatiotemporal variability of T. japonicus and to determine GAM performance and predictability, we analyze catch per unit effort (CPUE) of T. japonicus from Beibu Gulf over four seasons (months) from 2013 to 2014. A generalized additive model (GAMs) is populated with water depth and remotely sensed sea surface temperature (SST), sea surface salinity (SSS), sea surface chlorophyll-a concentration (Chl-a) and sea level anomaly (SLA). The CPUE of T. japonicus varies seasonally, with higher CPUE in summer and autumn than in spring and winter, and the highest CPUE in summer. GAM results explain 57% of the deviation explained in CPUE, with the most important variables being SLA, Month, Depth, SSS, and SST , each explaining 21.2%, 18.7%, 10.7%, 5.1%, and 1.3% of the variation in CPUE, respectively. This species occurs mainly between 50 and 75 m depth, SSS values 32.3–33.5 PSU and SST 25–30.5 °C. High CPUE sites occur near SLA ≤ 0 m, on the edge of cold eddies, and there is a certain catch near the sea surface with SLA ≥ 0 m. The spatial and temporal distribution of T. japonicus is affected by the season and the marine hydrological environment. This study might contribute to a better understanding of the distributional patterns of T. japonicus as well as provide a basis for sustainable management in the Beibu Gulf.


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