伊姆裸甲藻溶藻菌LD-B3的分离鉴定及溶藻作用          下载免费PDF全文

李俊佳  陈磊  王君玥  蔡月凤  申欣  姬南京 《应用海洋学学报》2024,43(1):192-200

近年来,有害藻华频繁发生给海洋生态系统甚至人类健康带来严重影响。伊姆裸甲藻（Gymnodinium impudicum）是一种典型有害藻华原因种,开展其溶藻菌筛选工作,将有利于该种藻华的防控研究。本研究从伊姆裸甲藻藻华发生海域,分离一株针对藻华原因种的溶藻菌LD B3,16S rDNA序列分析表明,该菌株属于假交替单胞菌属（Pseudoalteromonas）。菌藻共培养结果显示,2.0%终浓度LD B3菌液添加72 h后,伊姆裸甲藻溶藻率达81.06%,且溶藻效应呈现浓度和时间依赖性。显微观察和生理参数测定结果表明,菌株LD B3可导致伊姆裸甲藻细胞链断裂,最大光合效率（Fv/Fm）下降。溶藻方式研究发现,菌株LD B3主要通过分泌胞外物质实现溶藻,且这类物质对温度较为敏感,初步推断其可能为蛋白类物质。本研究结果表明菌株LD B3在伊姆裸甲藻溶藻剂开发方面有一定应用前景。  相似文献   

玻利维亚多尔各市D铜矿矿物元素组合分带及找矿预测     

胡加昆  吴文飞  郄晓鑫  陈子聪  李敬  陆俊吉 《地质论评》2020,66(4):942-963

玻利维亚多尔各市D铜矿地处安第斯褶皱带中段,西科迪勒拉构造带东侧南端。矿体主要赋存于多尔各组二段(E3t2)地层中。通过对多尔各市D铜矿矿物分带、主元素及微量元素组合分析,采用数理统计分析方法。研究结果表明:(1)粉砂岩型矿化(Ⅰ型矿化):近矿硅化增加,矿化范围叠加石膏脉,围岩泥质(脉)含量减少,方解石化(隐晶质)发育减弱;远离矿化硅化减弱,石膏脉消失,方解石化增强,泥化增强。(2)砂砾岩型矿化(Ⅱ型矿化):近矿硅化增加,矿化范围叠加石膏脉,围岩泥质(脉)含量减少,方解石化(隐晶质)减弱;远离矿化段,硅化减弱,石膏脉消失,方解石化增强,泥化增强。(3)石英脉型矿化(Ⅲ型矿化):内带主要发育矿化、硅化,最显著的特征为发育大量矿化脉及石英脉;外带发育泥质脉及石英脉。(4)Cu—Ag元素组合为矿区重要的矿化元素组合内带,Ca—Mn元素组合为矿区近矿围岩褪色蚀变元素组合中带,U—V元素组合为矿区含矿"红层"元素组合外带。通过矿物分带、地球化学元素分析,确定找矿靶区,并在靶区探获铜矿量770.08万吨、平均品位1.77%、金属量136304t。  相似文献   

萨热克盆地库孜贡苏组(J3k)对特提斯洋关闭的沉积响应     

胡加昆  陆俊吉  杨福全 《地质学报》2020,94(4):1091-1105

班公湖-怒江特提斯洋关闭时间和俯冲方向一直备受关注而且争议较大,前人的研究多半是班-怒缝合带的形成年龄,对于班公湖-怒江特提斯洋俯冲碰撞引起的远程效应却少有报道,所以研究班公湖-怒江特提斯洋关闭过程在西南天山地区引起的远程沉积响应很有必要。班公湖-怒江特提斯洋俯冲碰撞引起西南天山地区的造山活动,西南天山的造山活动使山体抬升剥蚀同时被凝灰石裂变径迹所记录,而山体剥蚀物质又被搬运至山间或山前盆地、最后沉积于山前或者山间盆地内,继而产生盆内的地层沉积充填响应;所以盆地内具磨拉石建造沉积的砾岩反映造山运动引起的山体剥蚀进而反映远处板块的俯冲碰撞情况。所以,对盆地内沉积砾岩的研究也是间接研究造山运动。通过西南天山山前萨热克盆地库孜贡苏组地层的砾石统计分析、沉积相分析、高分辨率层序地层学分析,得到萨热克盆地物源分为北北东和正西两个方向、是冲积扇相沉积、划分为两个中期旋回。结果显示晚侏罗世班公湖-怒江特提斯洋俯冲碰撞过程引起的远程响应可分为两个期次,第一期次构造活动较弱;第二期次构造活动剧烈,沉积了厚层的细砾岩、中砾岩和粗砾岩。冲积扇砾岩的沉积暗示了班公湖-怒江特提斯洋在晚侏罗世末期板块向北俯冲的;班公湖-怒江特提斯洋向北俯冲碰撞引起西南天山抬升剥蚀。  相似文献   

Mass Concentration and Mineralogical Characteristics Aerosol Particles Collected at Dunhuang During ACE-Asia   总被引：1，自引：0，他引：1  

SHEN Zhenxing  CAO Junji  LI Xuxiang  Tomoaki OKUDA  WANG Yaqiang  ZHANG Xiaoye 《大气科学进展》2006,23(2)

Measurements were performed in spring 2001 and 2002 to determine the characteristics of soil dust in the Chinese desert region of Dunhuang, one of the ground sites of the Asia-Pacific Regional Aerosol Characterization Experiment (ACE-Asia). The mean mass concentrations of total suspended particle matter during the spring of 2001 and 2002 were 317 μg m-3 and 307 μg m-3, respectively. Eleven dust storm events were observed with a mean aerosol concentration of 1095 μg m-3, while the non-dusty days with calm or weak wind speed had a background aerosol loading of 196 μg m-3 on average in the springtime.The main minerals detected in the aerosol samples by X-ray diffraction were illite, kaolinite, chlorite, quartz,feldspar, calcite and dolomite. Gypsum, halite and amphibole were also detected in a few samples. The mineralogical data also show that Asian dust is characterized by a kaolinite to chlorite (K/C) ratio lower than 1 whereas Saharan dust exhibits a K/C ratio larger than 2. Air mass back-trajectory analysis show that three families of pathways are associated with the aerosol particle transport to Dunhuang, but these have similar K/C ratios, which further demonstrates that the mineralogical characteristics of Asian dust are different from African dust.  相似文献   

Preface to the Special Issue on Carbon Neutrality: Important Roles of Renewable Energies,Carbon Sinks,NETs, and non-CO₂ GHGs     

Junji CAO  Ning ZENG  Yi LIU  Bengang LI  Pengfei HAN 《大气科学进展》2022,39(8):1207-1208

<正>The year 2020 witnessed milestone commitments to carbon neutrality with the EU,China,USA,Japan,South Korea,Canada,and South Africa,each pledging to reach net-zero carbon emissions.Countries that have adopted or have considered net-zero targets now represent 63%of the total contributions to global greenhouse gas (GHG) emissions.  相似文献   

新疆乌恰萨热克含铜盆地上侏罗统库孜贡苏组复合型冲积扇沉积相研究   总被引：1，自引：0，他引：1  

乔欣  胡煜昭  江小均  陆俊吉 《地质通报》2016,35(11):1884-1894

新疆萨热克含铜盆地库孜贡苏组是复合型冲积扇沉积相,是重要的赋矿层。利用研究区24个钻孔和10个露头剖面资料,运用高分辨率层序地层学原理进行单孔沉积相、连孔沉积相、平面沉积相分析,对新疆萨热克含铜盆地库孜贡苏组(J3k)复合型冲积扇内部垂向和3个中期旋回期间沉积相亚相的平面分布特征进行了研究。研究表明,该区库孜贡苏组垂向分布大体可分为3个中期基准面旋回和若干短期基准面旋回,据此建立了高分辨率层序地层对比格架。3个中期旋回期间,沉积亚相平面发育模式差异大。铜矿(化)体垂向、平面分布特征明显。  相似文献   

Transport Patterns and Potential Sources of Atmospheric Pollution during the XXIV Olympic Winter Games Period     

Yuting ZHANG  Xiaole PAN  Yu TIAN  Hang LIU  Xueshun CHEN  Baozhu GE  Zhe WANG  Xiao TANG  Shandong LEI  Weijie YAO  Yuanzhe REN  Yongli TIAN  Jie LI  Pingqing FU  Jinyuan XIN  Yele SUN  Junji CAO  Zifa WANG 《大气科学进展》2022,39(10):1608-1622

The attainment of suitable ambient air quality standards is a matter of great concern for successfully hosting the XXIV Olympic Winter Games (OWG). Transport patterns and potential sources of pollutants in Zhangjiakou (ZJK) were investigated using pollutant monitoring datasets and a dispersion model. The PM_2.5 concentration during February in ZJK has increased slightly (28%) from 2018 to 2021, mostly owing to the shift of main potential source regions of west-central Inner Mongolia and Mongolian areas (2015–18) to the North China Plain and northern Shanxi Province (NCPS) after 2018. Using CO as an indicator, the relative contributions of the different regions to the receptor site (ZJK) were evaluated based on the source-receptor-relationship method (SRR) and an emission inventory. We found that the relative contribution of pollutants from NCPS increased from 33% to 68% during 2019–21. Central Inner Mongolia (CIM) also has an important impact on ZJK under unfavorable weather conditions. This study demonstrated that the effect of pollution control measures in the NCPS and CIM should be strengthened to ensure that the air quality meets the standard during the XXIV OWG.  相似文献   

The Chinese Carbon-Neutral Goal: Challenges and Prospects     

Ning ZENG  Kejun JIANG  Pengfei HAN  Zeke HAUSFATHER  Junji CAO  Daniel KIRK-DAVIDOFF  Shaukat ALI  Sheng ZHOU 《大气科学进展》2022,39(8):1229-1238

On 22 September 2020, within the backdrop of the COVID-19 global pandemic, China announced its climate goal for peak carbon emissions before 2030 and to reach carbon neutrality before 2060. This carbon-neutral goal is generally considered to cover all anthropogenic greenhouse gases. The planning effort is now in full swing in China, but the pathway to decarbonization is unclear. The needed transition towards non-fossil fuel energy and its impact on China and the world may be more profound than its reform and development over the past 40 years, but the challenges are enormous. Analysis of four representative scenarios shows significant differences in achieving the carbon-neutral goal, particularly the contribution of non-fossil fuel energy sources. The high target values for nuclear, wind, and bioenergy have approached their corresponding resource limitations, with solar energy being the exception, suggesting solar’s critical role. We also found that the near-term policies that allow for a gradual transition, followed by more drastic changes after 2030, can eventually reach the carbon-neutral goal and lead to less of a reduction in cumulative emissions, thus inconsistent with the IPCC 1.5°C scenario. The challenges and prospects are discussed in the historical context of China’s socio-economic reform, globalization, international collaboration, and development.  相似文献   

Measuring and modeling black carbon (BC) contamination in the SE Tibetan Plateau   总被引：1，自引：0，他引：1  

Junji Cao  Xuexi Tie  Baiqing Xu  Zhuzi Zhao  Chongshu Zhu  Guohui Li  Suixin Liu 《Journal of Atmospheric Chemistry》2010,67(1):45-60

Black carbon (BC) concentrations were measured in the southeast (SE) Tibetan Plateau along the valley of the Yarlung Tsangpo River during winter (between November, 2008 and January, 2009). The measured mean concentration (0.75 μg m⁻³) is significantly higher than the concentrations (0.004–0.34 μg m⁻³) measured in background and remote regions of the globe, indicating that Tibetan glaciers are contaminated by BC particles in the Plateau. Because BC particles play important roles for the climate in the Tibetan Plateau, the sources and causes of the BC contamination need to be understood and investigated. In this study, a mesocale dynamical model (WRF) with BC particle modules is applied for analyzing the measurement. The analysis suggests that the major sources for the contamination in the SE Plateau were mainly from the BC emissions in eastern Indian and Bangladesh. Because of the west prevailing winds, the heavy emissions in China had no significant effects on the SE Plateau in winter. Usually, the high altitude of the Himalayas acts a physical wall, inhibiting the transport of BC particles across the mountains to the plateau. This study, however, finds that the Yarlung Tsangpo River valley causes a 'leaking wall', whereby under certain meteorological conditions, BC particles are being transported up onto the glacier. This too causes variability of BC concentrations (ranging from 0.3 to 1.5 μg m⁻³) in a time scale of a few days. The analysis of the variability suggests that the “leaking wall” effect cannot occur when the prevailing winds were northwest winds, during which the BC transport along the valley of the Yarlung Tsangpo River was obstructed. As a result, large variability of BC concentration was observed due to the change of prevailing wind directions.  相似文献   

    

Junji Koyama  Feng Deyi  Yao Jialiu 《地震学报(英文版)》1996,9(1):179

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