三亚湾珊瑚来源虫黄藻不同株系微环境中微生物群落结构的差异比较分析     

黄思军  邱晨  龙超  龙丽娟 《热带海洋学报》2022,41(6):90-104

虫黄藻、细菌和造礁石珊瑚有着密切的共生关系, 但虫黄藻藻际细菌群落尚未得到广泛研究。本研究对5个属的6株虫黄藻进行了离体培养, 其中2株为悬浮型虫黄藻(E型), 4株为贴壁型虫黄藻(A—D型)。通过采集藻株培养物3种粒径的样本开展细菌群落分析, 分别为0.2~3μm(自由生活)、>3μm(附着于藻体或颗粒物)与Settling(沉底贴壁藻体上)。结果发现, 2种生活方式的藻株藻际细菌群落具有显著差别, 贴壁型藻株细菌群落的物种丰富度显著高于悬浮型藻株。发现7个属的细菌广泛存在于所有的藻株中, 它们代表了A—E型虫黄藻藻际细菌的核心类群。对3种粒径样本的核心细菌群落比较发现, 自由生和颗粒附着生的核心细菌群落十分相似, 但均与沉底贴壁样本差异明显。  相似文献   

3D analogue modeling of the South China Sea: A discussion on breakup pattern     

Zhen Sun  Zhihong Zhong  Myra Keep  Di Zhou  Dongsheng Cai  Xushen Li  Shimin Wu  Jianqun Jiang 《Journal of Asian Earth Sciences》2009,34(4):544-556

The opening of the South China Sea is one of the most important Cenozoic events in SE Asia. In order to investigate its tectonic evolution, three analogue modeling experiments were compared. The modeling results suggest that rifting pattern and orientation change of the rift zone were related to initial rheological stratification. Affected by the ductile flow of silicone (lower crust) and honey (asthenosphere), the faults became flattened, especially close to the breakup area. We conjecture that the slope area may bear relatively hotter and thinner lithosphere than the shelf area from the beginning of rifting due to stretching and mantle upwelling associated with this regional extension, which in turn lead to the change in initial rheological stratification and therefore the rifting pattern from shelf to slope. In the experiments, breakup developed first at isolated points, which grew and coalesced to become a single spreading area. The conjugate boundaries were either all concave or all convex. Where a rigid massif was located at the divergent boundary, stretching history was different. In this case, the northern and southern areas thinned rapidly and developed into two deep troughs, which may finally evolve into spreading centers. The shape of the massif controls the orientation and boundary shape of the spreading area. It is interpreted that crustal breakup was more viscous in style, and the NW sub sea basin developed along the northern trough of the Zhongsha-Xisha massif (Macclesfield Bank).  相似文献   

无人值守天气雷达远程监控系统设计与实现     

匡昌武  符樑  王定贵 《气象科技》2011,39(3):360-362

介绍了无人值守的新一代天气雷达远程监控系统的设计思路和实现技术,详细论述了雷达硬件系统和相关软件系统的监控方法。该系统可以远程实时在线监控雷达的工作状态,并根据监控信息发送短信报警,通过远程桌面处理相关故障。通过这种方式,实现了新一代天气雷达运行状态监控的自动化,提高了雷达的运行效率和资料传输质量。  相似文献   

Effects of monsoon onset vortex on heat budget in the mixed layer of the Bay of Bengal     

Xu  Kang  Liu  Boqi  Liu  Yu  Wang  Weiqiang  He  Zhuoqi 《中国海洋湖沼学报》2020,38(6):1616-1631

Journal of Oceanology and Limnology - We investigated the effects of monsoon onset vortex (MOV) on the mixed layer heat budget in the Bay of Bengal (BOB) in spring 2003 using the reanalysis...  相似文献   

Characterization of Fe(III)-Reducing Enrichment Cultures and Isolation of Enterobacter sp. Nan-1 from the Deep-Sea Sediment,South China Sea     

Dunfan Wang  Chong Jin  Aimin Jin  Zhanghua Lou 《中国海洋大学学报(英文版)》2020,19(4):818-826

To characterize the Fe(III)-reducing bacteria, enrichment cultures were initiated by inoculating deep-sea sediment from the South China Sea (SCS) into the  相似文献   

南海北部西沙海槽北侧陆坡块体搬运沉积体系的发育特征及演化   总被引：1，自引：0，他引：1  

秦志亮  吴时国  王大伟  李伟  宫少军  米立军  George Spence 《海洋学报(英文版)》2015,34(9):117-125

Triple mass-transport deposits(MTDs) with areas of 625, 494 and 902 km2, respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic reflection data and multi-beam bathymetric data, the Quaternary MTDs are characterized by typical geometric shapes and internal structures. Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°. The head wall scarps of the MTDs arrived to 50 km in length(from headwall to termination). Their inner structures include well developed basal shear surface, growth faults, stepping lateral scarps, erosion grooves, and frontal thrust deformation. From seismic images, the central deepwater channel system of the Xisha Trough has been filled by interbedded channel-levee deposits and thick MTDs. Therefore, we inferred that the MTDs in the deepwater channel system could be dominated by far-travelled slope failure deposits even though there are local collapses of the trough walls. And then, we drew the two-dimensional process model and threedimensional structure model diagram of the MTDs. Combined with the regional geological setting and previous studies, we discussed the trigger mechanisms of the triple MTDs.  相似文献   

Hyperextended crustal structure of the Qiongdongnan Basin and subsequent magmatic influence from the Hainan mantle plume     

Xia  Shaohong  Fan  Chaoyan  Wang  Dawei  Cao  Jinghe  Zhao  Fang 《中国科学:地球科学(英文版)》2022,65(5):845-862

Science China Earth Sciences - The Qiongdongnan Basin (QDNB) is a rift basin located in the extension direction of the oceanic ridge of the Northwest Subbasin of the South China Sea. This basin is...  相似文献   

Seismic Imaging and 3D Architecture of Yongle Atoll of the Xisha Archipelago, South China Sea     

WU Shiguo  ZHANG Hanyu  QIN Yongpeng  CHEN Wanli  LIU Gang  HAN Xiaohui 《《地质学报》英文版》2022,96(5):1778-1791

Yongle atoll in the Xisha (Paracel) Archipelago is an isolated carbonate platform developed on Precambrian metamorphic and Mesozoic volcanic rocks since the early Miocene. To identify the 3D stratigraphic architecture and evolution of this platform, 13 high-resolution seismic profiles and shallow-to-deep water multi-beam data were processed and analyzed to reveal seismic facies, sequence boundary reflectors, seismic units, and platform architecture. Nine types of seismic facies were recognized based on their geometry, which included seismic amplitude, continuity, and termination patterns; additionally, six reflections, i.e., Tg, T60, T50, T40, T30, and T20, were identified in the Cenozoic strata. Five seismic units, SQ1 (lower Miocene), SQ2 (middle Miocene), SQ3 (upper Miocene), SQ4 (Pliocene), and SQ5 (Quaternary), were identified from bottom to top across the platform. The platform grew rapidly in the middle Miocene and backstepped in the late Miocene–Pliocene. Here, we discuss the developmental characteristics and evolution of the Yongle Atoll, in combination with drilling wells, which can be divided into four stages: the initiation stage in the early Miocene, the flourishing stage in the middle Miocene, the partial-drowning stage in the late Miocene–Pliocene, and modern atoll in the Quaternary.  相似文献   

造礁石珊瑚共生藻对富营养的响应研究     

雷新明  黄晖  王华接  李秀保  练健生 《海洋通报》2009,28(1)

研究了多孔鹿角珊瑚(Acropora millepora)及其共生藻在硝酸盐、铵盐、磷酸盐胁迫条件下的响应.结果表明,石珊瑚共生藻光合效率在各营养盐浓度下分别受到程度不同的抑制;表面共生藻密度及共生藻叶绿素 a 含量在硝酸盐、磷酸盐和铵盐与磷酸盐结合条件下都有所降低,但前者较后者的变化有所滞后;在铵盐作用下表面共生藻密度和共生藻叶绿素 a 含量均有所升高.以石珊瑚共生藻光合效率及叶绿素 a 含量作为指示珊瑚共生体系对胁迫的响应指标较为灵敏.  相似文献   

西北太平洋超强台风Tembin(2012)引起的海表面降温与强混合研究     

管守德  侯一筠 《海洋与湖沼》2020,51(6):1301-1309

鉴于台风等极端海洋环境下现场观测资料的匮乏,本文综合了多源卫星遥感和Argo浮标剖面观测资料分析了西北太平洋和南海上层海洋对超强台风Tembin（2012）的响应。Tembin引起了较强的海表面温度降低,降温主要集中在台风路径附近,最大降温为10.3℃,出现在朝鲜半岛南部的近岸海区;微波+红外遥感融合观测海表面温度数据可以弥补单一微波遥感观测在近岸海区缺测的不足,但观测海表面降温比单一微波遥感观测偏小;基于Argo观测的垂向高分辨率温盐剖面和混合参数化方法,发现台风后上层海洋混合明显增强,其混合率增强可达10倍以上。  相似文献