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Characteristics of zooplankton community in North Yellow Sea unveiled an indicator species for the Yellow Sea Warm Current in winter: Euchaeta plana

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Journal of Oceanology and Limnology 2020年第6期38卷 1762-1770页

作者： chen hongju ZHU Yanzhong LIU Guangxing Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266200China Research Center of Ecological Environment for Yangtze River Economic Belt Chinese Research Academy of Environmental SciencesBeijing 100012China

Zooplankton distributions are largely influenced by both biotic and abiotic factors in the surrounding *** zooplankton species can be used as bio-indicators for particular currents and water masses to help discover the dynamics of water current in the *** this study,we investigated the distribution of zooplankton in North Yellow Sea(NYS)during winter when the Yellow Sea Warm Current(YSWC)influenced that *** communities in the NYS were dominated by temperate and warm-temperate species,such as Calanus sinicus,Paracalanus parvus,Acartia bifilosa,and Sagitta *** warm-water species,Eucheata plana and Sagitta enflata were also *** analysis grouped NYS zooplankton into three communities,the Shandong Coastal Community(SCC)in the Shandong neritic area,the Yellow Sea Central Community(YSCC)in the central waters of the NYS,and the Liaoning Coastal Community(LCC)in the Liaoning neritic *** varied significantly among these communities,with an average of 102.2 ind./m^3 in SCC,179.8 ind./m^3 in YSCC,and 1244.2 ind./m^3 in *** and the bottom(3 m from the sea floor)temperature were likely the primary abiotic factors influencing zooplankton *** appearance of ***,an indicator species for the YSWC path,indicated a significant northwestward trend for the YSWC in 2007.

关键词： North Yellow Sea Yellow Sea Warm Current zooplankton bio-indicator community structure

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Comparison of Copepod Collection Efficiencies by Three Commonly Used Plankton Nets: A Case Study in Bohai Sea, China

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Journal of Ocean University of China 2016年第6期15卷 1007-1013页

作者： chen hongju YU Hao LIU Guangxing The Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China College of Environmental Science and Engineering Ocean University of China

Abstract Selection of net with a suitable mesh size is a key concern in the quantitative assessment of zooplankton, which is cru- cial to understand pelagic ecosystem processes. This study compared the copepod collecting efficiency of three commonly used plankton nets, namely, the China standard coarse net （505 gm mesh）, the China standard fine net （77 gin）, and the WP-2 net （200 μm） The experiment was performed at six stations in the Bohai Sea during the autumn of 2012. The coarse net substantially un- der-sampled small individuals （body widths 〈 672 gm） and led to the lowest species number in each tow, whereas the fine net col- lected all small copepod species but failed to collect rare species. The WP-2 net appeared to be a compromise of the two other nets, collecting both small copepods and rare species. The abundance of copepods collected by the coarse net （126.4±86.5 indm-3） was one to two orders of magnitude lower than that by the WP-2 net （5802.4 ± 2595.4 indm3）, and the value of the fine net （11117.0±4563.41 indm-3） was nearly twice that of the WP-2 net. The abundance of large copepods （i.e., adult Calanus sinicus） in the three nets showed no significant differences, but the abundance of small copepods declined with decreasing mesh size. The dif- ference in abundance resulted from the under-sampling of small copepods with body widths 〈 672 μm and 〈 266μm by the coarse and WP-2 nets, respectively.

关键词： plankton net collection efficiency copepod Bohai Sea abundance

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Distribution and Abundance of Pelagic Tunicates in the North Yellow Sea

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Journal of Ocean University of China 2014年第5期13卷 782-790页

作者： Pietro Franco chen hongju LIU Guangxing Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China College of Environmental Science and Engineering Ocean University of China

In this paper, the distribution patterns and abundance of pelagic tunicates in the North Yellow Sea of China during the period 2006-2007 were analyzed. Zooplankton samples were obtained with vertical towing from bottom to surface using a WP2 plankton net(200 μm mesh size; mouth area: 0.25 m2). Five species belonging to two classes were identified: Oikopleura dioica, O. longicauda and Fritillaria borealis belonging to class Appendicularia; Salpa fusiformis and Doliolum denticulatum of class Thaliacea. O. dioica and O. longicauda were the dominant species, occurring in the samples of all four seasons, with different distribution patterns. Their maximum abundance were 1664.7 ind. m-3(spring) and 1031.7 ind. m-3(spring) respectively. Following Oikopleura spp. were D. denticulatum, which was found only in autumn with an average abundance of 149.6 ind. m-3, and S. fusiformis, which was detected all the year long except for autumn with low abundance(max. abundance 289.4 ind. m-3 in summer). Only a very small amount of F. borealis was detected in summer samples, with an average abundance of 2.7 ind. m-3. The relationship between tunicates abundances and the environmental factors was analyzed using the stepwise regression model for each species. The variation of appendicularian abundance showed a significant correlation with the surface water temperature and with the concentration of Chl-a. No relationship was found between tunicates abundance and salinity, likely due to the slight changes in surface salinity of the studied area during the four seasons. Salps abundance and that of doliolids were significantly correlated to bottom water temperature, indicating that these two species(S. fusiformis and D. denticulatum) migrate vertically in the water column. In particular D. denticulatum, known to be a warm water species, showed not only an important correlation with water temperature, but also a spatial distribution connected to the warm currents in the North Yellow Sea. The o

关键词： North Yellow Sea pelagic tunicates abundance distribution sea surface temperature

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表面增强拉曼光谱法快速检测水产品中恩诺沙星和环丙沙星残留

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福建农业学报 2024年第3期39卷 362-368页

作者：刘文静潘葳林惠真陈宏炬严绍德福建省农业科学院农业质量标准与检测技术研究所/福建省农产品质量安全重点实验室福建福州350003 厦门市普识纳米科技有限公司福建厦门361021 厦门市质量技术评审服务中心福建厦门361021

【目的】建立基于表面增强拉曼光谱(surface-enhanced Raman scattering,SERS)检测水产品中恩诺沙星(enrofloxacin,ENR)和环丙沙星(ciprofloxacin,CIP)残留的方法。【方法】以水产品为研究对象,采用粒径(50±5)nm的银纳米溶胶作为SERS增强试剂,200 g·L^(-1)NaCl溶液作为萃取试剂,3 min内判读结果,并建立了峰强度与浓度的线性回归方程,考察线性关系和检出限,对该方法进行评价。【结果】ENR和CIP的拉曼光谱特征峰为532、552、651、737、785 cm^(-1),其中532 cm^(-1)归属于C-N的弯曲振动;552 cm^(-1)归属于C-N面外弯曲振动;651 cm^(-1)归属于C-N、C-C-F面外弯曲振动和C-C=O面内弯曲振动;737 cm^(-1)归属于苯环上C-H的伸缩振动、CC=O的面外弯曲振动、C-C-N弯曲振动;785 cm^(-1)归属于C-H、C-N的面外弯曲振动。通过对ENR和CIP的特征峰(737 cm^(-1))进行定量分析发现拉曼特征峰强度与溶液浓度在10~200 ng·mL^(-1)内有良好的线性关系,R2>0.96,加标回收率为78.4%~106.7%,RSD值为2.1%~6.7%,方法检出限为10μg·kg^(-1)。【结论】该方法准确、快速、稳定,可实现ENR和CIP在水产品中的现场快速筛查检测。

关键词：表面增强拉曼光谱恩诺沙星环丙沙星快速检测

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Diel vertical migration of mesozooplankton in the northern Yellow Sea

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Journal of Oceanology and Limnology 2021年第4期39卷 1373-1386页

作者： Ruping GE hongju chen Guangxing LIU Yanzhong ZHU Qiang JIANG Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266200China National Joint Research Center for Yangtze River Conservation Chinese Research Academy of Environmental SciencesBeijing 100012China

The Yellow Sea Cold Water Mass(YSCWM),one of the most vital hydrological features of the Yellow Sea,causes a seasonal thermocline from spring to *** diel vertical migration(DVM)of zooplankton is crucial to structural pelagic communities and food webs,and its patterns can be aff ected by thermocline depth and ***,we investigated zooplankton community succession and seasonal changes in zooplankton DVM at a fixed station in the *** zooplankton community succession was aff ected by the forming and fading of the YSCWM.A total of 37 mesozooplankton taxa were *** highest and lowest species numbers in autumn and spring were *** highest and lowest total densities were observed in autumn(14464.1 inds./m^(3))and winter(3115.4 inds./m^(3)),*** DVM of the dominant species showed obvious seasonal *** the YSCWM was weak in spring and autumn,most species(*** parvus,Oithona similis,and Acartia bifilosa)stayed above the thermocline and vertically migrated into the upper *** sinicus and Aidanosagitta crassa crossed the thermocline and vertically *** species migrated through the stratification in summer,and all of the species were limited above(*** and ***)or below(*** and Centropages abdominalis)the *** YSCWM disappeared in winter,and zooplankton species were found throughout the water ***,the existence of thermocline influenced the migration patterns of *** analyses showed that the existence of YSCWM resulted in significant differences between zooplankton communities above and below the thermocline.

关键词： mesozooplankton diel vertical migration Yellow Sea Cold Water Mass North Yellow Sea thermocline

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Formation Mechanism of the High-quality Upper Paleozoic Natural Gas Reservoirs in the Ordos Basin

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Acta Geologica Sinica(English Edition) 2005年第6期79卷 843-855页

作者： ZHAO Wenzhi WANG Zecheng chen Menjin ZHENG hongju Research Institute of Petroleum Exploration and Development Petrochina Beijing 100083

The upper Paleozoic natural gas reservoirs in the Ordos basin are generally characterized by a large gas-bearing area and low reserve abundance. On such a geological background, there still exist gas-enriched zones, with relatively high outputs, high reserve abundance and stably distributed gas layers. The gas-enriched layers with relatively high permeability （the lower limit permeability is 0.5×10^-3μm^2） are key factors for the enrichment and high output of natural gas. Based on core observation, analytic results of inclusions, and a great deal of drilling data, we proposed the following four mechanisms for the formation of high-quality reservoirs：（1） in the source area the parent rocks are mainly metamorphic rocks and granites, which are favorable to keeping primary porosity; （2） under the condition of low A/S （accommodation/sediment supply） ratios, sandstone complex formed due to multistage fluvial stacking and filling are coarse in grain size with a high degree of sorting, low content of mud and good physical properties; （3） early-stage recharge of hydrocarbons restricted compaction and cementation, and thus are favorable to preservation of primary pores; （4） microfractures caused by the activity of basement faults during the Yanshan Movement stage can not only improve the permeability of tight sandstones, but also afford vertical pathways for hydrocarbon gas migration.

关键词： lithology of parent rock A/S ratio recharge of hydrocarbons microfractures multistage fluvial complex upper Paleozoic Ordos Basin

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Spatial and Temporal Variations of Pelagic Copepods in the North Yellow Sea

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Journal of Ocean University of China 2015年第6期14卷 1003-1012页

作者： chen hongju LIU Guangxing ZHU Yanzhong JIANG Qiang Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of China College of Environmental Science and Engineering Ocean University of China State Environmental Protection Key Laboratory of Estuary and Coastal Environment Chinese Research Academy of Environmental Sciences

This study aims to analyze the spatial and temporal variations of the abundance and biodiversity of pelagic copepods and their relationships with the environmental factors in the North Yellow Sea(NYS). These variations were analyzed on the basis of the survey data of the NYS in four seasons from 2006 to 2007. A total of 31 copepod species that belong to 17 genera, 13 families and 4 orders were identified in the four seasons. Of these copepods, the species belonging to Calanoida is the most abundant component. The dominant species include Calanus sinicus, Centropages abdominalis, Paracalanus parvus, Acartia bifilosa, Oithona plumifera, and Corycaeus affinis. C. sinicus is the most important and widely distributed dominant species in all of the seasons. The dominant species have not shown any significant variation for the past 50 years. However, the richness of warm-water species increased. The abundance of copepods significantly varied among different seasons: the average abundance was higher in spring(608.2 ind m^(-3)) and summer(385.1 ind m^(-3)) than in winter(186.5 ind m^(-3)) and autumn(128.0 ind m^(-3)). Factor analyses showed a high correlation between the spatial distributions of dominant copepods and environmental parameters, and Chl-a was the most important factor that influenced the distribution of copepods. This research can provide the fundamental information related to zooplankton, especially pelagic copepods. This research is also beneficial for the long-term monitoring of zooplankton ecology in the NYS.

关键词： copepod species composition abundance community structure North Yellow Sea

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Spatial and temporal variations of macro-and mesozoo-plankton community in the Huanghai Sea (Yellow Sea) and East China Sea in summer and winter

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Acta Oceanologica Sinica 2011年第2期30卷 84-95页

作者： chen hongju QI Yanping LIU Guangxing Key Laboratory of Marine Environment and Ecology Ministry of Education OceanUniversity of China Qingdao 266100 China

The study was conducted during two cruises of June–August 2006 （summer）,and January–February 2007 （winter） in the Huanghai （Yellow） Sea and East China *** and temporal variations of zooplankton abundance,biomass and community structure and its relation to currents and water masses over the continental shelf were examined.A total of 584 zooplankton species/taxa and 28 planktonic larvae were identified during the two *** were the most abundant component among these identified *** abundance and biomass fluctuated widely and showed distinct heterogeneity in the shelf *** zooplankton assemblages were identified with hierarchical cluster analysis during this study,and they were Huanghai Sea Assemblage,Changjiang Estuary Assemblage,Coastal Assemblage,East China Sea Mixed-water Assemblage and East China Sea Offshore *** changes of zooplankton community composition and its geographical distribution were detected,and the locations of the faunistic areas overlap quite well with water masses and current *** we suggest that the zooplankton community structure and its changes were determined by the water masses in the Huanghai Sea and East China *** results of this research can provide fundamental information for the long-term monitoring of zooplankton ecology in the shelf of Huanghai Sea and East China Sea.

关键词： zooplankton abundance biomass community structure the Huanghai Sea (Yellow Sea) the East China Sea

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A viscosity model of waxy-hydrate slurry

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Petroleum 2021年第4期7卷 496-501页

作者： hongju chen Shunkang Fu Shuai Chai Qingyun Liao Bohui Shi Jing Gong State Key Laboratory of Natural Gas Hydrate/National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum-BeijingFuxue Road No.18Changping DistrictBeijing102249PR China Key Lab of Deepwater Engineering CNOOC Research InstitutePR China Sinopec Engineering Incorporation Beijing100101PR China

With the exploration and development of oil and gas fileds going towards into deep-water fields,high waxy reservoir has much more flow assurance issues of encourage complex solids depositions in the transportation system,especially hydrates and *** risk management such as hydrate slurry technology to control hydrate blockage,has much more economic and technical advantages,comparing to the traditional *** is significant to understand the viscosity of the waxy-hydrate slurry using hydrate slurry technology in high wax content *** this work,based on a simplification idea by coupling the wax content effect into the viscosity,volume and density of the water-in-waxy oil emulsion,a new viscosity model of waxy-hydrate slurry is established according to the Einstein effective medium theory,based on the experiments carried out in a high-pressure rheology system with different wax contents ranging from 0.5 wt%~2.0 wt%.The effect of the complex aggregate coupling wax-hydrate-water is considered by function the non-Newtonian coefficient by four dimensionless ***-fitting results within an improved deviation of±15%indicate the feasibility of this method is *** work can provide a valuable reference for the application of hydrate slurry technology in deep-water fields with high wax content reservoir.

关键词： Waxy-hydrate slurry Viscosity Flow assurance

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乌鳢种质及其养、繁殖技术研究进展

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浙江海洋大学学报（自然科学版） 2024年第2期43卷 175-182页

作者：李娴陈红菊安丽朱树人朱永安山东省淡水渔业研究院山东济南250013 山东农业大学山东泰安271017

乌鳢是我国内陆地区重要的淡水经济鱼类,因适应性强广泛分布在除青藏和西北以外的全国各主要流域,但水环境变化和过度捕捞等原因使其野生资源受到严重影响。从种质资源分布保存、种质特性、繁殖、养殖等方面系统梳理了乌鳢的研究及开发... 详细信息

乌鳢是我国内陆地区重要的淡水经济鱼类,因适应性强广泛分布在除青藏和西北以外的全国各主要流域,但水环境变化和过度捕捞等原因使其野生资源受到严重影响。从种质资源分布保存、种质特性、繁殖、养殖等方面系统梳理了乌鳢的研究及开发利用情况,并在资源保护、良种选育、绿色养殖等方面提出了展望,以期为乌鳢种质的研究、保护和产业发展提供参考。

关键词：乌鳢种质养殖繁殖研究进展

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