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Distribution characteristics of total mercury and methylmercury in the topsoil and dust of Xiamen, China

LIANG Ying,YUAN Dongxing,LU Min,GONG Zhenbin,LIU Xiyao,ZHANG Zhen,

环境科学学报(英文版) , 2009,
Abstract: The levels and distribution of mercury (Hg) species, including total mercury (THg) and methylmercury (MeHg) in the topsoil and dust collected from twenty sampling stations located in different land function areas of Xiamen, China, were investigated. The THg concentrations in topsoil ranged from 0.071 to 1.2 mg/kg, and in dust ranged from of 0.034 to 1.4 mg/kg. For stations where the THg of dust was less than 0.31 mg/kg, THg concentrations in the topsoil were significantly correlated to those in the corresponding dust (r = 0.597, n = 16, P = 0.014). The MeHg concentrations in topsoil were varied between 0.14 and 5.7 μg/kg. The ratios of MeHg/THg in the topsoil ranged from 0.069% to 0.74%. The range of MeHg concentration in the dust were 0.092–2.3 μg/kg. The ratios of MeHg/THg in the dust were at the same level as those in the topsoil. The MeHg concentrations in both topsoil and dust were linked to corresponding THg concentrations and soil organic matter. Neither THg nor MeHg concentration in the topsoil and dust was obviously linked to the land function.
Comparison of Meiofaunal Abundance in Two Mangrove Wetlands in Tong'an Bay, Xiamen, China Comparison of Meiofaunal Abundance in Two Mangrove Wetlands in Tong'an Bay, Xiamen, China  [PDF]
ZHOU Xiping,CAI Lizhe,FU Sujing
- , 2015,
Abstract: To compare meiofaunal community in the two mangrove wetlands in Tong'an Bay, Xiamen, China, and probe the response of meiofauna to high organic matter, sampling was carried out in Fenglin and Xiang'an mangrove wetlands in the bay. The results showed that the Ne/Co ratio(nematode to benthic copepod) and organic matter in Fenglin mangrove wetland were higher than those in Xiang'an mangrove wetland. The meiofaunal abundance in Fenglin mangrove was all lower than that in Xiang'an mangrove wetland in summer, autumn and spring, while the meiofaunal abundance in Fenglin mangrove was higher than that in Xiang'an mangrove wetland in winter. Two-way ANOVA results showed that the meiofaunal abundance and nematode abundance were significantly different between regions, seasons and region×season. With all the results in the present study, we confirmed that the positive response of meiofaunal and nematode abundance were only detected for medium organic matter contents according to the Xiang'an wetland's level, and that the distribution of meiofaunal abundance would be influenced by sand content. Higher copepod abundance and lower N/C value usually suggest better environmental quality
Contamination of soil, leaves and vegetables by polychlorinated biphenyls in Xiamen region, China
MASKAOUI Khali,ZHOU Jun-liang,HAN Ya-li,HU Zhong,ZHENG Tian-ling,HONG Hua-sheng,
,ZHOU Jun-liang,HAN Ya-li,HU Zhong,ZHENG Tian-ling,HONG Hua-sheng

环境科学学报(英文版) , 2005,
Abstract: The paper aimed to identify the primary of polychlorinated biphenyls(PCBs) in the Jiulong River Estuary, investigate the spatial distribution of PCBs contamination in the environment, localize the atmospheric source and evaluate ongoing PCBs emissions by analyzing soil samples collected along the Jiulong River region. In addition, the accumulation of PCBs in the human food chain was quantified by analyzing leaf of orange trees and vegetable samples collected along a gradient of soil/atmospheric contamination moving away from the source. Consequently, the impact on the human health and the ecosystem was quantified, different management options were proposedto reduce this impact and to carry out research on organic contaminants along the Jiulong River and Xiamen region.
A risk assessment system for alien plant bio-invasion in Xiamen, China

Desmond KO TOOLE,

环境科学学报(英文版) , 2008,
Abstract: Bio-invasion has caused serious ecosystem damage and enormous economic losses in China,and it has been the greatest factor to island bio-diversity reduction.Xiamen,as an important seaport with a relatively high conservation value,is particularly vulnerable to bio-invasion for its typical island ecosystem as well as frequent human-made disturbance.As a result of field surveys,literature review, and consultation with experts,a list of 67 alien plants identified as major invaders(12 species)and emerging inv...
Successful Integrated Coastal Zone Management (ICZM) Program Model of a Developing Country (Xiamen, China) – Implementation in Bangladesh Perspective  [PDF]
Kazi Shakila Islam,Xiong-zhe Xue,Mohammed Mahabubur Rahman
Journal of Wetlands Ecology , 2009, DOI: 10.3126/jowe.v2i1.1854
Abstract: This paper represents the overall current situation of two Integrated Coastal Zone Management (ICZM) programs- one is as a successful model like Xiamen ICZM program in China and another is as a developing project like ICZM program in Bangladesh. The paper begins with an attempt to track the evolution of policies and their implementation on coastal zone management with particular reference from both the countries. It then discusses the coastal management and livelihood issues that predicate the different socio-economic and environmental situation between the two countries. The paper then goes on to discussion how the institutional management and policy initiatives of Xiamen ICZM have dealt with in the perspective of Bangladesh. There is a brief consideration of the progress of the management for ICZM of Bangladesh and how this project might be more effective and beneficial for Bangladesh. Key words: Integrated coastal zone management, Socio-economic, Bangladesh, Institutional management DOI: 10.3126/jowe.v2i1.1854 Journal of Wetlands Ecology , (2009) vol. 2, pp 34-40
Remote sensing of the urban heat island and its changes in Xiamen City of SE China
XU Han-qiu,CHEN Ben-qing,
XU Han-qiu
,CHEN Ben-qing

环境科学学报(英文版) , 2004,
Abstract: World-wide urbanization has significantly modified the landscape, which has important climatic implications across all scales due to the simultaneous removal of natural land cover and introduction of urban materials. This resulted in a phenomenon known as an urban heat island(UHI). A study on the UHI in Xiamen of China was carried out using remote sensing technology. Satellite thermal infrared images were used to determine surface radiant temperatures. Thermal remote sensing data were obtained from band 6 of two Landsat TM/ETM\ images of 1989 and 2000 to observe the UHI changes over 11-year period. The thermal infrared bands were processed through several image enhancement technologies. This generated two 3-dimension-perspective images of Xiamen's urban heat island in 1989 and 2000, respectively, and revealed heat characteristics and spatial distribution features of the UHI. To find out the change of the UHI between 1989 and 2000, the two thermal images were first normalized and scaled to seven grades to reduce seasonal difference and then overlaid to produce a difference image by subtracting corresponding pixels. The difference image showed an evident development of the urban heat island in the 11 years. This change was due largely to the urban expansion with a consequent alteration in the ratio of sensible heat flux to latent heat flux. To quantitatively compare UHI, an index called Urban-Heat-Island Ratio Index(URI) was created. It can reveal the intensity of the UHI within the urban area. The calculation of the index was based on the ratio of UHI area to urban area. The greater the index, the more intense the UHI was. The calculation of the index for the Xiamen City indicated that the ratio of UHI area to urban area in 2000 was less than that in 1989. High temperatures in several areas in 1989 were reduced or just disappeared, such as those in old downtown area and Gulangyu Island. For the potential mitigation of the UHI in Xiamen, a long-term heat island reduction strategy of planting shade trees and using light-colored, highly reflective roof and paving materials should be included in the plans of the city planers, environmental managers and other decision-makers to improve the overall urban environment in the future.
Pollution characteristics of organic and elemental carbon in PM2:5 in Xiamen, China

Fuwang Zhang,Jinping Zhao,Jinsheng Chen,Ya Xu,Lingling Xu,

环境科学学报(英文版) , 2011,
Abstract: Xiamen,located on the southeastern coastal line of China,is undergoing rapid urbanization and industrialization,so its air quality has a trend of degradation.However,studies on level,temporal and spatial changes of fine particles (PM2.5) and their carbonaceous fractions are scarce.In this article,abundance,sources,seasonal and spatial variations,distribution of organic carbon (OC) and elemental carbon (EC) in PM2.5,were studied at suburban,urban and industrial sites in Xiamen during four season-representative months in 2009-2010.PM2.5 samples were collected with middle volume sampler and were analyzed for OC and EC with thermal optical transmittance (TOT) method.Results showed that the annual average PM2.5 concentrations were 63.88-74.80 μg/m3 at three sites.While OC and EC concentrations were in the range of 15.81-19.73 μg/m3 and 2.74-3.49 μg/m3,respectively,and clearly presented the summer minima and winter maxima in this study.The carbonaceous aerosol accounted for 42.8%-47.3% of the mass of PM2.5.The annual average of secondary organic carbon (SOC) concentrations in Xiamen were 9.23-11.36 μg/m3,accounting for approximately 56% of OC.Strong correlations between OC and EC was found in spring (R2 = 0.50) and autumn (R2 = 0.73),suggesting that there were similar emission and transport processes for carbonaceous aerosols in these two seasons,while weak correlations were found in summer (R2 = 0.33) and winter (R2 = 0.41).The OC/EC ratios in PM2.5 varied from 2.1 to 8.7 with an annual average of 5.7,indicating that vehicle exhaust,coal smoke and biomass burning were main source apportionments of carbonaceous fractions in Xiamen.
Meeting report: 2009 international conference on molecular neurodegeneration May 18-20, 2009, Xiamen, China
Yunwu Zhang, Lisa Owens, Guojun Bu
Molecular Neurodegeneration , 2009, DOI: 10.1186/1750-1326-4-43
Abstract: As life expectancy continues to increase and a growing number of people enter the aged population, neurodegenerative diseases have increasingly become a major problem for which treatments are critically needed. Although much progress has been made in the past 20 years on understanding the mechanisms of neurodegenerative diseases and on developing novel therapeutic strategies, most of these achievements are from the United Stated and European countries. Neurodegeneration research in Asian countries, most of which are very populated and also suffered severely with the spread of neurodegenerative diseases, is lagged far behind. The 2009 International Conference on Molecular Neurodegeneration is designed to bridge this gap. The major aim of this meeting is to provide a unique platform for Asian researchers and scientists from Western countries to exchange information and ideas, to share their most recent research advances, and to establish future collaborations in neurodegeneration studies.This conference is jointly sponsored by Molecular Neurodegeneration http://www.molecularneurodegeneration.com/ webcite, an open access, peer-reviewed online journal that publishes all aspects of neurodegeneration research, and Institute for Biomedical Research, Xiamen University http://biomed.xmu.edu.cn/ webcite, which is dedicated to revealing the fundamental molecular causes of diseases and devising the innovative therapies of tomorrow. Finacial supports of this meeting come from both foundations and pharmaceutical companies including Alzheimer's Association, Ellison Medical Foundation, National Natural Science Foundation of China, Science and Technology Bureau of Xiamen City, Raptor Pharmaceutical, GlaxoSmithKline, Beckman Coulter, Zeiss, Perkin Elmer, Millipore, Applied Biosystems, and Genetimes Techonolgoy, Inc. Drs. Guojun Bu from Washington University School of Medicine and Huaxi Xu from Burnham Institute for Medical Research, Editors-in-Chief of Molecular Neurodegeneration, ar
Quantification, morphology and source of humic acid, kerogen and black carbon in offshore marine sediments from Xiamen Gulf, China
Yanting Chen,Jinping Zhao,Liqian Yin,Jinsheng Chen,Dongxing Yuan,
Yanting Chen
,Jinping Zhao,Liqian Yin,Jinsheng Chen,Dongxing Yuan

环境科学学报(英文版) , 2013,
Abstract: Three types of macromolecular organic matters (MOMs), i.e. humic acid (HA), kerogen+black carbon (KB), and black carbon (BC) were extracted from marine sediments of Xiamen Gulf, southeast of China. The chemical composition, morphological property and source of the three extractions were characterized by elemental analyzer/isotope ratio mass spectrometry (EA/IRMS) and scanning electron microscope (SEM). The results showed that KB was the predominant fraction in MOMs, which accounted for 61.79%-89.15% of the total organic content (TOC), while HA consisted less than 5%. The relative high contents of kerogen and BC, and low contents of HA in the samples indicated that anthropogenic input might be the major source of organic matter in marine sediments near the industrial regions. The characterization of SEM, not only revealed morphological properties of the three fractions, but also allowed a better understanding of the source of MOMs. The δ13C values of the three fractions suggested that materials from terrestrial C3 plants were predominant. Furthermore, the anthropogenic activities, such as the discharge of sewage, coal and biomass combustion from industry nearby and agricultural practices within drainage basin of the Jiulong River, were remarkably contributed to the variations in δ13C values of MOMs in the offshore marine sediments.
Diurnal variation of nitrated polycyclic aromatic hydrocarbons in PM10 at a roadside site in Xiamen, China
Shuiping Wu,Bingyu Yang,Xinhong Wang,Huasheng Hong,Chungshin Yuan,
Shuiping Wu
,Bingyu Yang,Xinhong Wang,Huasheng Hong,Chungshin Yuan

环境科学学报(英文版) , 2012,
Abstract: Intensive daytime and nighttime sampling was carried out from 23 Oct to 31 Dec 2008 to investigate the occurrence of nitrated polycyclic aromatic hydrocarbons (NPAHs) in PM10 at a roadside site in Xiamen, China. At the same time, six PM10 samples were collected from a nearby roadway tunnel for comparison. Six NPAHs, namely 9-nitroanthracene, 2-and 3-nitrofluoranthene, 1-nitropyrene, 7-nitrobenza]anthracene, and 6-nitrobenzoa]pyrene, were identified and quantified using GC/MS in negative ion chemical ionization mode. The average total concentration of six NPAHs (∑NPAHs) in the cold season (26 Nov-31 Dec) was 2.3 (daytime) and 9.9 (nighttime) times higher than those in the warm season. Significant statistical difference (p < 0.01, 2-tailed) of ∑NPAHs between daytime and nighttime was found during both the warm and cold seasons. NPAHs were significantly positively correlated with their parent PAHs and nitrogen dioxide but negatively correlated with ambient temperature. The ratio of 2 + 3-nitrofluoranthene to 1-nitropyrene exhibited a similar diurnal pattern as ∑NPAHs and was generally greater than 5, indicating the importance of secondary atmospheric formation. The diurnal variations of NPAHs were all influenced by the diurnal variations of PAHs, nitrogen dioxide, sunlight, and temperature. The daily inhalable exposure to the six NPAHs in the tunnel was much higher than the roadside values in the warm season but only slightly higher than those in the cold season.
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