Phytoplankton community characteristics in the coastal waters of the southeastern Arabian Sea Phytoplankton community characteristics in the coastal waters of the southeastern Arabian Sea     

MINU P  SHAJU S S  MUHAMED ASHRAF P  MEENAKUMARI B 《海洋学报(英文版)》2014,(12)

Remote sensing applications are important in the fisheries sector and efforts were on to improve the predic-tions of potential fishing zones using ocean color. The present study was aimed to investigat...  相似文献   

Ecological indicators showing the succession of macrofauna communities in Sonneratia apetala artificial mangrove wetlands on Qi’ao Island at Zhuhai, South China     

TANG Yijie  FANG Zhanqiang  ZHANG Zaiwang  ZHONG Yanting  CHEN Kang  LIU Benhan  FAN Junjie  XIONG Tiantian  LU Xiaosheng 《海洋学报(英文版)》2014,33(8):62-72

The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities （analysis of the Pielou evenness index and Shannon-Wiener diversity index）. The system in-formation （specific exergy） increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information （the specific exergy）, there was a decline in the network relationships （Pielou evenness index and Shannon-Wiener diversity index）. Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes （network structure and system information）, it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information  相似文献   

海洋生境刀鲚菌群PCR-DGGE指纹图谱构建及分析     

聂志娟  徐钢春  程起群  杜富宽  张勇  顾若波 《海洋科学》2014,38(10):63-69

为了分析海洋生境刀鲚(Coilia nasus)体内及生长环境菌群结构,作者采用免培养16S r DNA的PCR-DGGE指纹图谱技术,对刀鲚鳃、肠道壁、肠道内容物及水体环境中的菌群结构进行了对比分析。结果表明:变性梯度为35%~55%、浓度为8%的聚丙烯酰胺凝胶,150V 60℃下电泳10 h,DGGE带谱的分离效果较好;刀鲚鳃、肠道壁、肠道内容物及水体样品指纹图谱上分别显示出24、19、14和29条信号强度不同的条带;相同样品重复组细菌结构相似度在80%以上,差异不显著;不同样品之间,刀鲚鳃与海水聚为一支,具有较高的相似度为52%,肠壁与肠内容物相似度为41%。样品菌群主要以未培养菌为主,主要包括变形菌、放线菌和厚壁菌。本文首次成功构建海洋生境刀鲚菌群16S r DNA的PCR-DGGE指纹图谱。  相似文献   

广西沿海不同演替阶段红树群落沉积物粒度分布特征   总被引：3，自引：1，他引：2  

邢永泽  周浩郎  阎冰  周如琼  吴斌 《海洋科学》2014,38(9):53-58

沉积物粒度分布是影响红树群落演替的重要因素之一。本文对代表广西红树群落演替趋势的白骨壤(Avicennia marina)、秋茄(Kandelia candel)、木榄(Bruguiera gymnorrhiza)3种红树群落沉积物进行了粒度分析。结果表明:3种红树群落沉积物类型均以砂和粉砂为主,随着红树林群落保存状况的逐渐变差,砂的含量逐渐上升,粉砂和黏土含量逐渐下降;沉积物粒径分布趋势均为砂粉砂黏土砾。木榄和秋茄2个群落底床沉积物不同深度沉积物粒径分布规律一致,但与白骨壤群落存在差异;3种红树群落的沉积物粒度频率曲线均呈现为双峰或多峰形态。  相似文献   

基于时空影响因子的未来社区生活圈公共服务设施优化配置北大核心CSCD     

余正  上官宗珊  周丹丹  刘同伟  黄奥婕  陈喜嘉  谢文煜  邹成畅 《测绘通报》2022,(8):143-148

公共服务设施作为社区生活圈的核心内容,直接决定了社区生活圈的生活品质。对社区公共服务设施建设情况进行量化评价,并对设施建设的未来规划提供科学决策支持逐渐成为规划者和决策者的一大难题。本文通过ArcGIS工具对POI数据进行处理、统计和可视化,在总结他人社区生活圈量化评价方法的基础上,结合温州本地特色,搭建了一套社区生活圈公共服务设施评价模型。利用该模型可对各类社区进行综合评分和分级,并根据模型评分结果挖掘公共服务设施未来优化方向。此外,还实现了社区生活圈评分的动态计算与展示,为社区服务设施建设选址、路网建设与公共服务设施建设优先级评定等提供决策支持。既可帮助规划者和决策者快速建立对整个区域生活圈建设现状的量化认知,又可助力公共服务设施的优化配置,为社区生活圈公共服务品质评价与提升探寻全新的思路与方法。  相似文献   

Microbial Processes in Stratified Lake Doroninskoe(Transbaikal Region)     

Savelii BURIUKHAEV  Bair NAMSARAEV  Vyacheslav DAMBAEV 《《地质学报》英文版》2014,88(Z1):125-126

正In recent decades,meromictic ponds attract the attention of researchers in different directions,because here the character of the physical,chemical and biological processes differ from those of typical mixing waters(Kuznetsov,1970;Hutchinson,1969).In Transbaikalia widely distributed soda and salt lakes with different salinity.Notable among them is Lake Doroninskoye,which has a pronounced stratification for a  相似文献   

An Integrated Study to Analyze Salt Lake Microbial Community Structure(Novosibirsk Oblast,Russia)     

Alla BRYANSKAYA  Alexey ROZANOV  Tatyana MALUP  Taisiya ALESHINA  Elena LAZAREVA  Oxana TARAN  Tatyana GORYACHKOVSKAYA  Vladimir IVANISENKO  Sergey PELTEK 《《地质学报》英文版》2014,88(Z1):61-62

正Salt Lake is one of the lakes in the system,consisting of a huge amount of salt and bitter-salty lakes in Novosibirsk Oblast and Altai Krai.These lakes are unique and highly unstable systems where the parameters of geochemical  相似文献   

Long-term Changes in the Saline Lake Qarun(Egypt)     

Gamal EL-SHABRAWY  Mohamed GOHAR  Mousa GERMOUSH  Elena ANUFRIIEVA  Nickolai SHADRIN 《《地质学报》英文版》2014,88(Z1):180-182

正1 Introduction There is now ample evidence of the impacts of the recent climate change and anthropogenic activities on different saline lake ecosystems.All over the world salt lakes are threatened by climate change,water diversions upstream for agricultural purposes,watershed changes,introduction of aliens,etc.that result in catastrophic  相似文献   

企业社区居民地方认同变化及作用机理——以西北第一印染厂社区为例     

黄坤  吴文恒  杨毕红  史海金 《热带地理》2022,42(5):751-761

地方认同是衡量人地情感、理解人与地方认知关系的重要概念,能够反映人地互动的复杂动态关系。企业社区作为重要的城市居住空间,理解居民地方认同对于科学开展城市社区更新、街区振兴与可持续发展具有重要意义。以西安市西北第一印染厂社区为例,采用扎根理论方法,分析社会环境变迁和社区重构影响下,居民个人身份与地方认同的变化及作用机理。研究发现：1）企业社区居民个人身份认同是从单位人向社会人,以及未来作为留守老年群体的转变。2）延续传承的集体记忆维系居民积极式认同,社会交往生疏化和社区管理社会化加剧地方认同弱化,破败的建筑环境和落后的配套设施带来消极式认同。3）居民在生活、成长的企业社区环境和社会互动中构建了自身及对地方的认同,随着外部社会环境与内部居民个体特征而变化。外部社会环境的国企改革、住房改革使企业转轨、社区社会空间转变,加以居住时间差异、个体特征、心理因素与个人经历变化等内部因素,共同塑造居民的地方认同及其变化过程。  相似文献   

南海地缘战略逻辑演进与南海命运共同体建构     

叶淑兰 《世界地理研究》2022,31(4):687-699

南海因其所具有的重要地缘政治与经济战略地位而成为大国竞相角逐之地。然而,在一个相互依赖的时代,南海地缘战略并非只是地缘政治冲突的单一逻辑,而是迈向政治与经济、文化交织、竞争与合作并存的复合逻辑状态。南海周边国家经贸互补性大于竞争性,已经形成互赖的地缘经济格局,但是南海地缘经济合作存在的制度重叠、制度竞争与制度过剩仍暴露了地缘经济中的竞争逻辑。“一带一路”作为新型区域合作平台,有助于超越传统地缘经济竞争逻辑。东亚意识的产生、南海地缘政治经济互赖以及南海制度规范的建立使得南海地缘文化在多元文化互动中迈向共同体逻辑。建构融安全、利益以及信任为一体的南海命运共同体,需要通过对话协商自主制定地区规则、加强南海地区功能性合作、通过多轨外交增进地区互信,使南海成为“友好、和平、合作”之海。  相似文献