[Evaluation of ecosystem service and emergy of Wanshan Waters in Zhuhai, Guangdong Province, China].

The method for monetary value and emergy value analysis of ecosystem service was used in this paper to analyze the change in value of marine ecosystem service of Wanshan District, Zhuhai from 2007 to 2012. The result showed that the monetary value and emergy value of marine ecosystem service of Wanshan District, Zhuhai rose to 11512840000 yuan and 1.97 x 10(22) sej from 7721630000 yuan and 1.04 x 10(22) sej, respectively. Both monetary value and emergy value could forecast the change in the value of marine ecosystem service, but they reflected different value structures and ecological energy, which could be used to more objectively evaluate the ecosystem service. Ecological civilization development, as an inherent driving force to impel the development of marine ecosystem service structure, was important for rational exploitation of marine resources and optimization of marine ecosystem service.

[Annual changes of phytoplankton's ecological features in Qinzhou Bay of South China].

Four cruise surveys were conducted on the phytoplankton in Qinzhou Bay of South China in different seasons in 2008-2009. A total of 131 phytoplankton species were identified, among which, diatom (101 species) accounted for 30.0% of the total, followed by pyrrophyta (23 species), and other groups (7 species). Most of the phytoplankton was of eurytherm or warm-water species. The total species number and the diatom abundance were the smallest in spring, and increased successively in summer, autumn, and winter, being the highest in winter. The phytoplankton density varied from 232.28 x 10(4) cell x m(-3) to 977.0 x 10(4) cell x m(-3), with an average of about 558.57 x 10(4) cell x m(-3). Temporally, the phytoplankton density was the highest in summer, followed by in spring, and the lowest in winter and autumn. Spatially, the phytoplankton density was increased from the inner bay to the open bay, and decreased from the open bay to outside the bay. In summer, the highest density area switched from the open bay to the bay' s entrance. The average Shannon diversity index was 3.18, and the average evenness index was 0.63, suggesting a high diversity of the phytoplankton community. The correlations of the phytoplankton density with the water temperature, salinity, dissolved inorganic phosphorus, and dissolved inorganic phosphorus varied with seasons.