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Study on acid-volatile sulfide(AVS), simultaneously extracted metals(SEM) and its toxic effect on the organism in intertidal sediments of donghai island, Zhanjiang

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Marine Science Bulletin 2014年第1期16卷 73-88页

作者：张际标刘加飞姚兼辉杨波陈春亮孙省利广东海洋大学海洋资源与环境监测中心广东湛江524088

The content and distribution of acid-volatile sulfide （AVS） and simultaneously extracted metals （SEM）（Cr Cu, Zn, Cd and Pb） were studied in surface sediments collected from the tidal fiat of donghai island, Zhanjiang. The results indicated that for most stations, the AVS concentration was higher in summer with the average of 0.449 μmol/g than that in winter with the average of 1.816 μmol/g. The AVS contents were higher in southern and northern areas and lower in western and eastern areas. The average content of ∑SEM was between 0.56 μmol/g and 4.60 μmol/g in summer and between 0.65μmol/g and 2.21 μmol/g in winter. The concentration change of single metal was Zn〉Cr〉Pb〉Cu〉Cd for most stations. The content percentage in ∑ SEM was below 1% for Cd and over 70% for Zn. SEMZn was the key pattern to control the distribution of T. SEM due to its high concentration percentage. Based on the assessment methods of （∑SEM/AVS） with （∑ SEM-AVS） and thresholds for metal toxicity to benthic organism, most values of （∑ SEM-AVS） in intertidal flats of donghai island were between 0 and 5. The most toxicity region was in Tongminghai area located in the west tidal zone of donghai island, and the most toxicity metal was zinc in Tongminghai area in summer. The land-based pollution and the environmental parameters such as sunlight, atmosphere temperature and hydrodynamic characteristics were the main affecting factors on the content level and distribution characteristics of AVS and SEM in intertidal sediments of donghai island.

关键词： AVS SEM surface sediments intertidal fiat donghai island

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Study on ecosytem service function change of island based on remote sensing

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Acta Oceanologica Sinica 2015年第8期34卷 100-107页

作者： WANG Li'an PAN Delu FU Dongyang State Key Laboratory of Satellite Ocean Environment Dynamics the Second Institute of Oceanography State Oceanic Administration Institute of Economics and Management Guangdong Ocean University

Based on the interpretation of the remote sensing data presented by the resource satellite, this paper states the fact that the land-use area in donghai island, which is located in the south of Zhanjiang, Guangdong Province, had expanded by 576.71 hm2 in the 25 years from 1986 to 2010 because of human activities such as land reclamation; in the meantime, great changes in types of land cover on the island have occurred. The definite change in land use leads to the remarkable transition in its ecosystem service value. Therefore, by applying the Costanza method in this paper to quantificationally analyze the changes in its ecosystem services on this island; the Costanza method is a calculation technique that shows the service value per unit area of island. It is found that from 1986 to 2010, especially in the recent years, due to the rapid development in the petrifaction, steel and port industries, the areas of cultivated land, woodland, grassland and desert have decreased in different degrees, while the lands for residence, industry and traffic construction and the areas of water and wetlands have increased. Consequently, compared with the number of RMB 547.57x10^6 yuan per year in 1986, the ecosystem service value of donghai island was greatly reduced to RMB 493.94x10^6 yuan per year in 2010. As for the spatial distribution, it presents a feature that it is higher in the west and low in the east. The results manifest that it is of great significance to analyze the changes in the ecosystem service function on the basis of the service value of the island presented by the remote sensing data in a quantificational way, which will contribute to the promotion of ecological compensation.

关键词： remote sensing land-use change ecosystem service value donghai island

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