The Benthic Diatom Community of the Xiangshan Bay

于2005年5月(春季)和11月(秋季)对浙江省象山港海域底栖硅藻进行采样调查,分析底栖硅藻的种类组成、丰度、优势种、多样性及群落结构的季节变化和平面分布特征,并讨论底栖硅藻与水温、盐度等环境因子之间的关系。共鉴定硅藻46属179种,硅藻种类数在春季共有46属164种,秋季减少到22属52种。种类组成以广温种为主,其次是暖水种和温水种。主要优势种有柱状小环藻(Cyclotella stylorum)、琼氏圆筛藻(Coscinodiscus jonesianus)等。细胞丰度范围在(0.007~6.851)×103个/g之间,平均值为1.522×103个/g。春季硅藻丰度较高,平均值为2.974×103个/g,秋季为0.071×103个/g。不同站位间硅藻的分布也表现出显著的差异,硅藻细胞丰度最高值位于港顶部鱼排密集区9号站位,春季细胞丰度值为6.851×103个/g,秋季细胞丰度值为0.143×103个/g。硅藻丰度较高的有位于鱼排区的3号、4号、5号、7号站位,其余较低。硅藻群落多样性指数和均匀度春季较高,秋季降低。底栖硅藻数量分布随季节变化明显,与盐度关系不大。The samples for the presen t study were collected from the surface sediments in the Xiangshan Bay,Zhejiang Province in May 2005 and November 2005 and were observed under a light microscope. The species composition, abundance, community structure and diversity were investigated. A total of 179 taxa belonging to46 genera of diatom were identified. The result showed that the ecotypes of diatom were mostly eurytopic species,next were warm water species and temperate species. The most dominant species were Cyclotella stylorum and Coscinodiscus jonesianus. The seasonal variation of diatom abundance was remarkable. The cell abundance of diatoms was higher in spring(2.974×103cells/g) than autumn(0.071×103cells/g). The number of species varies with change of season, demonstrating the adaptability of diatoms to the temperature of water. The species diversity of benthic diatom was lower in autumn than spring.欧盟第六框架与发展中国家合作项目“海岸带复合系统中的生态海水养殖研究”(No.INCO-CT-2004-510706);; 国家自然科学基金(No.41476116

象山港潮间带底栖硅藻的分布及其与环境关系探讨

于2005年5月和11月对浙江省象山港潮间带底栖硅藻进行采样调查,分析了底栖硅藻的种类组成、丰度、优势种、多样性及群落结构的季节变化和平面分布特征.并讨论了底栖硅藻与水温、营养盐、潮汐等环境因子之间的关系.共鉴定硅藻33属124种.硅藻数量分布随季节变化明显,春季细胞丰度高于秋季.主要优势种为柱状小环藻(Cyclotella stylorum),春、秋季平均占总细胞数的25.8%.种类的季节变化反应硅藻对水温的适应性,潮汐、盐度、pH值对底栖硅藻组成影响并不明显.秋季营养元素含量升高,多样性指数降低

C_(60)离子束撞击固体表面坍塌沉积物的拉曼光谱研究

Ｃ６０离子束撞击固体表面坍塌沉积物的拉曼光谱研究唐紫超任斌黄荣彬田中群郑兰荪（固体表面物理化学国家重点实验室厦门大学化学系厦门３６１００５）ＣｏｌａｐｓｅｄＤｅｐｏｓｉｔｉｏｎｏｆＡｃｃｅｌａｔｅｄＣ６０ＢｅａｍｏｎＳｏｌｉｄＳｕｒｆａｃｅｓ——Ｃ..

Diatom assemblages in surface sediments from the South China Sea as environmental indicators

We studied diatom distribution from 62 samples from the uppermost 1 cm of sediment in the South China Sea (SCS), using grabs or box corers in three cruises between 2001-2007. Fifty six genera, 256 species and their varieties were identified. Dominating species included Coscinodiscus africanus, Coscinodiscus nodulifer, Cyclotella stylorum, Hemidiscus cuneiformis, Melosira sulcata, Nitzschia marina, Roperia tesselata, Thalassionema nitzschioides, Thalassiosira excentrica, and Thalassiothrix longissima. Most surface sediments in the SCS were rich in diatoms, except for a few coarse samples. Average diatom abundance in the study area was 104 607 valve/g. In terms of the abundance, ecology, and spatial distribution, seven diatom zones (Zones 1-7) were recognized. Zone 1 (northern continental shelf) is affected by warm currents, SCS northern branch of the Kuroshio, and northern coastal currents; Zone 2 (northwestern continental shelf) is affected by intense coastal currents; Zone 3 (Xisha Islands sea area) is a bat..

First record of genera Rutilaria and Trigonium(Bacillariophyta) and 11 diatom taxa(species and varieties) in South China Sea

Diatom taxa in samples collected from the uppermost 1-cm sediment of the South China Sea(SCS) during cruises in 2000,2001,and 2007 were investigated.Among them,two genera,Rutilaria and Trigonium,and 11 marine taxa(species and varieties) were described for the first time in China.The 11 taxa,Rutilaria radiata,Asterolampra grevillei,Biddulphia turrigera,Cocconeis cyclophora var.decora,Cocconeis ocellata,Dictyoneis marginata,Entogonia davyana,Tryblionella campechiana,Plagiogramma kinkeri,Plagiogramma nankoorense and Trigonium cf.contumax,were mainly extant species,although Rutilaria radiata and Entogonia davyana are fossils.Available data show that these species are mainly present in the eastern and western Pacific Ocean and the Indian Ocean.A large number of taxa newly recorded in this study were previously reported in the Philippines.The presence of these taxa in both locations is likely a result of seawater exchange in the SCS through the Bashi Channel.Taxonomic descriptions,habitats,and distributions of each..

5-tert-butylbenzene-1,3-dicarboxylic acid

通讯作者地址: Ng,SW(通讯作者),Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Univ Malaya, Dept Chem, Kuala Lumpur 50603, Malaysia 电子邮件地址: [email protected] the crystal structure of the title compound, C12H14O4, the carboxy groups are linked across centers of inversion by O-H center dot center dot center dot O hydrogen bonds; the resulting hydrogen-bonded chain adopts a zigzag motif

Collapsed Deposition of Accelerated C_(60) Beam on Solid Surfaces (Ⅰ) Confocal Raman Microscopic Studies

通讯作者地址: Tang, ZC (通讯作者), Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R ChinaRaman spectroscopy was applied to characterize the species deposited from the mass-selected C-60 ion beam which was accelerated to 900 eV. The substrates for the deposition were (0001) surface of highly oriented pyrolitic graphite and (111) surface of gold crystal. The species do not exhibit the Raman scattering features of buckminsterfullerene, but displays peaks at 1585 and 1332 cm(-1) instead. The former peak is the characteristic Raman peak of hexagonal graphite, and the latter can be attributed of the amorphous carbon in sp(3) hybridization. The result reveals that C-60 was collapsed to form a new phase when it collides on the solid surface.国家自然科学基金;国家教委资

Change of scouring and silting during 1954 to 2008 in the sea bed of Dongshan Bay,Fujian

本文通过对比东山湾20世纪50、70、90年代和2008年等不同时期的海图和实测水深资料,对东山湾内近50 a间的海底冲淤变化特征进行了分析.结果表明:1954~2008年间,东山湾经历了从淤积向冲刷的转变.20世纪50年代至70年代,东山湾内滩涂和水下浅滩主要呈淤积特征,并以0、2 m等深线变化最大;20世纪70年代至90年代,东山湾内滩涂、水下浅滩及潮汐通道的水深和位置变化均较小,仅局部略有调整;20世纪90年代至2008年,东山湾整体呈冲刷状态,并以东北部和西南部最为明显.总体来看:东山湾内近50 a间的海底冲淤变化区域主要发生在水动力较弱的滩涂和水下浅滩区;东山湾口门潮汐通道处,长期处于冲淤动态平衡中.除了自然因素,漳江上游峰头水库的建成、东山湾东北部围垦、西南部八尺门海堤的建成及21世纪以来湾内海砂开采是近50a间东山湾局部冲淤变化的控制因素.By comparing bathymetric data surveyed in the 1950 s,1970 s and 1990 s and 2008,this paper analyzes the characteristics of scouring and silting changes in the sea bed of Dongshan Bay in over 50 years. The results show that Dongshan Bay has experienced the evolution from silting to scouring during 1954 to 2008. Dongshan Bay tidal flats and underwater shoals underwent mainly a silting state from 1950 s to 1970 s,and the significant change appeared in 0 and 2 meter depth contour. During 1970 s and 1990 s,the depth and position changes of the tidal flats,underwater shoals and tidal channels were small except for slightly modified location. From 1990 s to 2008,Dongshan Bay was in the condition of scour,and the most obvious scouring occurred in the northeast and southwest of the bay. In general,the scouring-silting variation occurred mainly on the tidal flats and underwater shoals. And the tidal channel at the entrance of the bay kept a long-term dynamic equilibrium. In addition to the influence of natural factors,the buildup of Fengtou Reservoir in the upstream of Zhangjiang River,the human reclamation in northeast of the bay,the buildup of Bachimen Dam in the southwest bay and sand mining were factors controlling the scouring and silting changes in local area of Dongshan Bay in over 50 years.国家自然科学基金资助项目(40976037

Collapsed Deposition of Accelerated C-60 Beam on Solid Surfaces

Raman spectroscopy was applied to characterize the species deposited from the mass-selected C-60 ion beam which was accelerated to 900 eV. The substrates for the deposition were (0001) surface of highly oriented pyrolitic graphite and (111) surface of gold crystal. The species do not exhibit the Raman scattering features of buckminsterfullerene, but displays peaks at 1585 and 1332 cm(-1) instead. The former peak is the characteristic Raman peak of hexagonal graphite, and the latter can be attributed of the amorphous carbon in sp(3) hybridization. The result reveals that C-60 was collapsed to form a new phase when it collides on the solid surface

Collapse of a mass-selected C-60 ion beam collided on crystal surfaces

Mass-selected C-60 ion beams were accelerated to different kinetic energies and deposited on the (0001) surface of highly oriented pyrolytic graphite and the (111) surface of a gold single-crystal. Scanning tunnelling microscopy (STM), Raman spectroscopy and laser desorption mass spectrometry were used to characterize the deposited species. The STM images showed that C-60 molecules colliding on the surface were not dissociated, but their cages collapsed and deformed to planar structures. The Raman spectra of the deposited species are different from the spectral feature of fullerene, and they were similar to that from the glassy carbon instead. The deposited species were desorbed and mass analysed. Both positive and negative C-60 ions were observed in the desorption mass spectra confirming that the species collapsing on the solid surface were the C-60 clusters. It was also found that the collision energy resulting in the collapse of the cage structure of C-60 was around 400 eV, and that fragmentation of the collapsed species does not occur if the energy does not exceed 1 kV