辽宁榆树沟铌—钽—稀土矿床成矿岩石成因及对成矿的指示作用     

刘欣 《地质论评》2023,69(Z1):169-170

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胶州湾海域表层沉积物细菌多样性   总被引：3，自引：0，他引：3  

刘欣  肖天  张文燕  董逸  岳海东 《海洋科学》2010,34(10):1-6

采用16S rDNA文库结合PCR-RFLP分析的手段,对胶州湾4个站位沉积物中的细菌多样性和群落特征研究分析。结果表明,沉积物中细菌种类丰富,最多包含分布于14个已知门类的细菌,和一些未被认知的序列;各站位沉积物中优势菌群均为变形菌门和酸杆菌门,其中γ-和δ-变形菌纲为变形菌门中的绝对优势类群,在4个文库序列中平均占42%和16.75%;此外,拟杆菌门、浮霉菌门和放线菌门的种类也较为大量存在。各细菌种群有较明显空间分布差异,可能与不同区域胶州湾环境条件相关。  相似文献   

长江口表层沉积物中可培养有机解磷菌多样性特征   总被引：1，自引：0，他引：1       下载免费PDF全文

鲁小曼  尚琨  刘欣  韦钦胜  冉祥滨  杜光迅  赵淑江  曲凌云 《海洋科学进展》2019,37(3)

为研究不同水文条件下长江口邻近海域表层沉积物中可培养解磷细菌的多样性,选择此海域20个站位,针对2017-02(枯水期)、2017-05(平水期)和2017-07(丰水期)取得的表层沉积物,利用卵磷脂选择性培养基筛选解磷菌。结果表明,从长江口表层沉积物中筛选获得的572株可培养有机解磷菌,分属于Firmicutes,Proteobacteria和Actinobacteria中19个属80个种。其中,从2017-02样品获得136株好氧解磷菌,优势属为嗜冷杆菌属(Psychrobacter),占比69.85%;从2017-05样品中获得123株好氧解磷菌,12株兼性厌氧解磷菌,优势属为芽孢杆菌属(Bacillus),占比54.81%;从2017-07样品中获得100株好氧解磷菌,201株兼性厌氧解磷菌,优势属为弧菌属(Vibrio),占比87.71%。同时平板解磷能力相对较强的菌株也主要为优势种属Psychrobacter和Vibrio。通过Shannon和Simpson多样性指数分析,发现解磷菌多样性程度为春季冬季夏季。实验结果表明,长江口表层沉积物中可培养有机解磷菌多样性丰富,同一区域内沉积物中的有机解磷菌群落结构存在季节差异。长江口表层沉积物中丰富的有机解磷细菌的存在必将是磷循环重要的参与者,可能在区域物质循环和环境问题中发挥了重要的作用。  相似文献   

辽宁北票煤田三宝深部煤层气资源特征     

刘欣 《辽宁地质》2000,17(3):238-240

依据煤田勘探及煤矿井下生产资料分析,认为北票煤田三宝含煤地层具有煤层和分散有机质（干络根）两种生气母质。煤层裂隙、断层附近以及煤层顶板砂岩是煤层气（瓦斯）储存的有利空间。煤系上部巨厚的泥岩层是天然的盖层。该区为超级瓦斯矿井就是佐证。初步估算煤层气资源应该在３０～４０亿ｍ＾３,故该区煤层气具有开发利用的潜力。  相似文献   

东太平洋海隆深海热液区沉积物微生物多样性的研究   总被引：2，自引：1，他引：1  

刘欣  SHAO Zong-ze 《台湾海峡》2008,27(3)

提取东太平洋海隆区深海热液系统沉积物样品的总DNA,构建沉积物中的细菌16S rDNA 克隆文库,通过PCR-RFLP分析与序列测定,对沉积物中的微生物类群及其与环境的关系进行了分析.结果表明,该海区沉积物中的36个克隆代表的22种基因型分别属于7个主要类群,其中变形菌(Proteobacteria)的γ-亚群为优势菌群,α-和β-亚群也均有分布;而硫氧化相关共生菌的属(sulfur-oxidizing symbionts)为优势种属.系统发育分析表明,在该沉积物中细菌主要是跟共生有关、跟C、S代谢相关,大多还能在无氧和高温环境的条件下生存,说明采样点具有典型的深海热液生态系统的特点,甲烷代谢和硫代谢在该区域的深海物质能量循环中占据着重要地位.另外大量新的极端微生物的存在,预示着该区域的微生物资源有着非常大的开发潜力.  相似文献   

Repair wind field in oil contaminated areas with SAR images     

过杰  何宜军  隆霄  侯查伟  刘欣  孟俊敏 《中国海洋湖沼学报》2015,33(2):525-533

In this paper,we compared the normalized radar cross section in the cases of oil spill,biogenic slicks,and clean sea areas with image samples made from 11-pixel NRCS average,and determined their thresholds of the NRCS of the synthetic aperture radar. The results show that the thresholds of oil and biogenic slicks exhibit good consistency with the corresponding synthetic aperture radar images. In addition,we used the normalized radar cross section of clean water from adjacent patches of oil or biogenic slicks areas to replace that of oil or biogenic slicks areas,and retrieve wind field by CMOD5.n and compare wind velocity mending of oil and biogenic slicks areas with Weather Research and Forecasting modeled data,from which the root mean squares of wind speed(wind direction) inversion are 0.89 m/s(20.26°) and 0.88 m/s(7.07°),respectively. Therefore,after the occurrence of oil spill or biogenic slicks,the real wind field could be repaired using the method we introduced in this paper. We believe that this method could improve the accuracy in assessment of a real wind field on medium and small scales at sea,and enhance effectively the monitoring works on similar oil or biogenic slicks incidents at sea surface.  相似文献   

我眼中的国土资源新常态     

刘欣  乔思伟  王传元  鲍家伟  许祥云 《国土资源》2015,(1):42-44

2014年5月,习近平总书记在河南考察时强调,我国发展仍处于重要战略机遇期,我们要增强信心,从当前我国经济发展的阶段性特征出发,适应新常态,保持战略上的平常心态。年底召开的中央经济工作会议,又对新常态作了专门的阐述。新常态被提出后,迅速被广为人知并引至多个领域,成为执政新理念的关键词。在国土资源领域,新常态应是什么样的?本版向读者征集到了他们眼中的国土资源新常态。  相似文献   

The Effect of the Warm Water and Its Weak Negative Feedback on the Rapid Intensification of Typhoon Hato (2017)     

霍子墨  端义宏  刘欣 《热带气象学报(英文版)》2020,26(4):402-416

Typhoon Hato (2017) went through a rapid intensification (RI) process before making landfall in Zhuhai, Guangdong Province, as the observational data shows. Within 24 hours, its minimum sea level pressure deepened by 35hPa and its maximum sustained wind speed increased by 20m s-1. According to satellite observations, Hato encountered a large area of warm water and two warm core rings before the RI process, and the average sea surface temperature cooling (SSTC) induced by Hato was only around 0.73℃. Air-sea coupled simulations were implemented to investigate the specific impact of the warm water on its RI process. The results showed that the warm water played an important role by facilitating the RI process by around 20%. Sea surface temperature budget analysis showed that the SSTC induced by mixing mechanism was not obvious due to the warm water. Besides, the cold advection hardly caused any SSTC, either. Therefore, the SSTC induced by Hato was much weaker compared with that in general cases. The negative feedback between ocean and Hato was restrained and abundant heat and moisture were sufficiently supplied to Hato. The warm water helped heat flux increase by around 20%, too. Therefore, the warm water influenced the structure and the intensity of Hato. Although there might be other factors that also participated in the RI process, this study focused on air-sea interaction in tropical cyclone forecast and discussed the impact of warm water on the intensity and structure of a tropical cyclone.  相似文献   

在不同温压条件下介质对岩石电性参数的影响     

Ла.  М 刘欣 《地震译文集》1989,(1):59-66,58

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“地域文化与城市发展”教学设计     

刘欣  程菊 《地理教学》2009,(5)

一、学习内容特征 高中地理必修二的内容侧重在人文地理学角度来考察人地之间的关系。其中第二章就是从城市的视角来研究人类活动对自然环境的影响。在城市发展过程中,除了在空间结构和规模范围上不断变化,更是形成了多种多样、丰富多彩的地域文化。地域文化是依托于城市形成的自然环境而产生,但又深深地影响着城市的发展。  相似文献