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Studies on marine nanodiatoms in fujian coastal waters of China in winter

Acta Oceanologica Sinica 1995年第2期14卷 261-268页

作者： Liu Shicheng Gao Yahui and Cheng Zhaodi(Department of Biology, Xiamen University, Xiamen 361005, China)

For the first time, nanodiatoms (20μm) in the coastal waters of Xiamen, Shandu, Fuqing, Haitan, Putian and Meizhou of fujian Province along the western coast of the Taiwan Strait are quantitatively counted by TEM in the paper. The results show that the number of nanodiatoms from all the station is more than that of microdiatoms, accounting for 92% of the species collected. This indicates that nanodiatoms constitute a large microcosm of the whole diatom group. Unfortunately, the lower resolution of light microscopes which have been used in the study of diatoms in the past makes this unneglectable microcosm unnoticed. Thanks to TEM, 47 species of nanodiatoms are identified and four of them are for the first time recorded in China. The new records are Hantzschia spectabilis, Navicula crucigera, Nav. spicula andNitzs. rosenstockii. The positive correlation between the contents of chlorophyll a and diatom cell number in the waters of Xiamen Harbour, which were determined simultaneously, shows that the variation of chlorophyll a content in the waters reflects, on the whole, the change of diatom number. In addition, the successful culture of nanodiatoms in the studies provides alternatives for the screening of high quality aquaculture feed.

关键词： fujian coast nanodiatoms microdiatoms

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Study on in-situ stress measurement around coastal marginal land in fujian

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Acta Seismologica Sinica(English Edition) 2005年第5期18卷 50-57,132页

作者：李宏安其美谢富仁 Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

The in-situ hydraulic fracturing stress measurements have been carried out around the coastal marginal land in Fu- jian Province. And the characteristics of magnitude, direction and distribution of tectonic stress have been obtained. Based on the observed stress data, the characteristics and activities of fault zones are analyzed and studied in the paper according to the Coulomb friction criteria. 1 The maximum horizontal principal compressive stress is in the NW-WNW direction from the north to the south along the coastline verge, which is parallel to the strike of the NW-trending fault zone, consistent with the direction of principal compressive stress obtained from geological structure and across-fault deformation data, and different from that reflected by focal mechanism solution by about 20°. 2 The horizontal principal stress increases with depth, the relation among three stresses is SH>Sv>Sh or SH≈Sv>Sh, and the stress state is liable to normal fault and strike-slip fault activities. 3 According to Coulomb friction criteria and taking the friction strength μ as 0.6~1.0 for analysis, the stress state reaching or exceeding the threshold for normal-fault frictional sliding near the fault implies that the current tectonic activity in the measuring area is mainly normal faulting. 4 The force source of current tectonic stress field comes mainly from the westward and northwestward horizontal extrusions from the Pacific and Philippine Plates respectively to the Eurasian Plate.

关键词： fujian coast active fault zone hydraulic fracturing stress measurement Coulomb friction criteria

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