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Seismic Images of Shallow Waters over the Shatsky Rise in the Northwest Pacific Ocean

Journal of Ocean University of China 2021年第5期20卷 1079-1088页

作者： ZHANG Jinchang LUO Yiming xing junhui Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyInnovation Academy of South China Sea Ecology and Environmental EngineeringChinese Academy of SciencesGuangzhou 510301China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China

Recent studies have demonstrated the ability of seismic oceanography to reveal finescale vertical structures of water column in the oceans based on multichannel seismic(MCS)reflection *** information can clarify the dynamic processes of mixing,exchange,and translation of water mass and *** this study,we present four MCS lines and satellite data to show high-resolution seismic images of shallow waters over the Shatsky Rise in the Northwest Pacific Ocean,where the Kuroshio Exten-sion passes and *** of our MCS transects crossed the center of an anticyclonic warm eddy on August 28,2010,confirmed by satellite data such as sea level anomaly(SLA),geostrophic current anomaly(GCA),and sea surface temperature anomaly(SSTa).The seismic image showed that the eddy vertical structure featured a bowl-like shape and onion-like internal *** slightly tilted(2°-3°)at the boundaries between water masses with differing *** addition,the discrepancies in SLA,GCA,and SSTa between water masses resulted in different seismic *** water masses with high SLA,anticyclonic GCA and positive SSTa featured high-amplitude,continuous,clear-layered,and non-linear reflections,whereas those with low SLA,cyclonic GCA,and negative SSTa were associated with weak,fragmented,less stratification,and more linear reflectors.

关键词： Kuroshio Extension mesoscale oceanic eddies vertical structure submesoscale structure seismic oceanography mul-tichannel seismic reflection

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Intensive management enhances mycorrhizal respiration but decreases free-living microbial respiration by affecting microbial abundance and community structure in Moso bamboo forest soils

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Pedosphere 2024年第2期34卷 508-519页

作者： Wenhao JIN Jiangfei GE Shuai SHAO Liyuan PENG Jiajia xing Chenfei LIANG junhui CHEN Qiufang XU Hua QIN State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China School of Environmental and Resource Sciences Zhejiang A&F UniversityHangzhou 311300China

Intensive management is known to markedly alter soil carbon(C)storage and turnover in Moso bamboo forests compared with extensive ***,the effects of intensive management on soil respiration(RS)components remain *** study aimed to evaluate the changes in different RScomponents(root,mycorrhizal,and free-living microorganism respiration)in Moso bamboo forests under extensive and intensive management practices.A1-year in-situ microcosm experiment was conducted to quantify the RScomponents in Moso bamboo forests under the two management practices using mesh screens of varying *** results showed that the total RSand its components exhibited similar seasonal variability between the two management *** with extensive management,intensive management significantly increased cumulative respiration from mycorrhizal fungi by 36.73%,while decreased cumulative respiration from free-living soil microorganisms by 8.97%.Moreover,the abundance of arbuscular mycorrhizal fungi(AMF)increased by 43.38%,but bacterial and fungal abundances decreased by 21.65%and 33.30%,respectively,under intensive *** management practices significantly changed the bacterial community composition,which could be mainly explained by soil pH and available *** fungi and intensive management affected the interrelationships between bacterial *** equation modeling indicated that intensive management changed the cumulative RSby elevating AMF abundance and lowering bacterial *** concluded that intensive management reduced the microbial respiration-derived C loss,but increased mycorrhizal respiration-derived C loss.

关键词： arbuscular mycorrhizal fungi extensive management microbial co-occurrence network root respiration soil organic C soil respiration structural equation model

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Research Progress of Seafloor Pockmarks in Spatio-Temporal Distribution and Classification

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Journal of Ocean University of China 2020年第1期19卷 69-80页

作者： XU Cuiling XU Guoqiang xing junhui SUN Zhilei WU Nengyou Key Laboratory of Gas Hydrate Qingdao Institute of Marine GeologyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Marine Geosciences/Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationQingdao 266100China The First Institute of Oceanography Ministry of Natural ResourcesQingdao 266071China

Seafloor pockmarks are important indicators of submarine methane seepages and slope *** order to promote the understanding of submarine pockmarks and their relationship with sediment instabilities and climate changes,here we summarize the research results of pockmarks in the spatio-temporal distributions and shaping *** of pockmarks occur along active or passive continental margins during the last 25 kyr B.P..Circular and ellipse are the most common forms of pockmarks,whereas pockmarks in a special crescent or elongated shape are indicators of slope instabilities,and ring-shape pockmarks are endemic to the gas hydrate *** researches should be focused on the trigger mechanism of climate changes based on the pockmarks in the high latitudes formed during the deglaciation periods,and the role of gas hydrates in the seafloor evolution should be *** addition,the feature of pockmarks at their early stage(e.g.,developing gas chimneys and gas driving sedimentary doming)and the relations between pockmarks and mass movements,mud diapirs could be further studied to clarify the influences of rapid methane release from submarine sediments on the atmospheric carbon contents.

关键词： pockmark cold seep methane seepage gas hydrate slump

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Stratigraphic Sequence and Sedimentary Systems in the Middle-Southern Continental Slope of the East China Sea from Seismic Reflection Data: Exploration Prospects of Gas Hydrate

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Journal of Ocean University of China 2019年第6期18卷 1302-1316页

作者： LI Deyong CHEN Hongyan XU Shujuan xing junhui CHENG Honggang WANG Jinkai Key Laboratory of Submarine Geosciences and Prospecting Techniques MOECollege of Marine GeosciencesOcean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Evaluation and Detection Technology Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266100China Research Institute of Petroleum Exploration&Development Langfang 065007China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Many evidences for gas hydrate bearing sediments had been found in the continental slope of the East China Sea,such as bottom simulating reflections(BSRs),undersea gas springs,pyrite associated with methane leakage,mud diapirs/mud volcanos,bottom-water methane anomalies and so *** this study,six key stratigraphic interfaces including T_0(seafloor),T_1(LGM,23 kyr B.P.),T_2(2.58 Myr),T_3(5.33 Myr),T_4(11.02 Myr)and T_5(16.12 Myr)were identified,and then five third-order sequences of SQIII1 to SQIII5 were ***,T5 in southern continental slope is not found,which shows that the middle-northern Okinawa Trough had begun to rift in the early Miocene,earlier than the southern *** system tracts including lowstand systems tract(LST),transgressive systems tract(TST),highstand systems tract(HST)and falling stage systems tract(FSST)are further *** marine erosion interface of 11.02 Myr and regressive unconformity interface of 23 kyr *** two large-scale sea level drop events in the research *** typical seismic facies identified in the continental slope are continental shelf-edge deltas,littoral fluvial-delta plains,incised channels or submarine canyons,slope fans,submarine fans or coastal sandbars,littoral-neritic finegrained sediments,mud volcanos and some other geological bodies *** minimum water depth for hydrate occurrence in the Okinawa Trough is 630 m,and the thickness of gas hydrate stability zone in continental slope is between 0 and 590 *** calculated bottom boundary of hydrate stability zone is slightly deeper than BSRs on the seismic *** re-depositional turbidite sand bodies,such as canyon channels,slope fans and submarine fans developed in Quaternary strata,are the predominant hydrate *** to developing process,the dynamic accumulation of hydrate systems can be divided into three evolutionary stages including canyon erosion and hydrate stability zone migration stage,sediments destabili

关键词： sequence stratigraphic architecture systems tract seismic facies depositional system submarine canyon gas hydrate stability zone hydrate dynamic accumulation continental slope of the East China Sea

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Application of Geoid Anomalies to the Tectonic Research in the East Asian Continental Margin

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Journal of Ocean University of China 2018年第4期17卷 811-822页

作者： WU Xiaoyang xing junhui LI Chaoyang LIU Xinzhe YANG Kai CHEN Hongyan GONG Wei College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education Evaluation and Detection Technology Laboratory of Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology

In this paper, we calculated multi-scale residual geoid anomalies with the method of geoid separation processing, according to EGM2008 ultra-high order gravity field model, remove-restore technique and Stokes integral. The East Asian continental margin was selected as the study area. The residual geoid anomalies have been calculated by programming. On the basis of residual geoid anomalies at various orders, the interlayer geoid anomalies at different depths were calculated to depict the spatial distribution characteristics of the residual geoid. Finally, we conducted a detailed geophysical interpretation for the study area according to the geoid anomalies in combination with other geophysical datasets. Four conclusions can be outlined as follows: 1) it is impracticable that geoid anomalies are used in the interpretation of the shallow objects due to the influence of the terrain; 2) the anomalies of residual geoid can reflect the intensity of small-scale mantle convection in the asthenosphere; 3) the interlayer geoid anomalies can reflect the magmatic activities associated with the mantle convection and mantle plume in different scales; 4) the study of the geoid may provide an approach for the research of the subduction zone, mantle convection and mantle plume.

关键词： EGM2008 gravity field model geoid anomalies the East Asian continental margin structural interpretations

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The MtRGF6 Peptide Differentially Regulates Root Development and Symbiotic Nodulation of Medicago truncatula and Lotus japonicus

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Phyton-International Journal of Experimental Botany 2024年第6期93卷 1237-1248页

作者： junhui Yan Yawen Wang Qiong Li Yu Zhou Xu Wang Li Luo School of Life Sciences Shanghai Key Laboratory of Bio-Energy CropsShanghai UniversityShanghai200444China College of Life Science State Key Laboratory of Tea Plant Biology and UtilizationAnhui Agricultural UniversityHefei230036China

Rhizobia induces nitrogen-ﬁxing nodules in legumes used in agricultural production,providing a direct source of combined nitrogen to leguminous *** peptides,such as CLAVATA3/EMBRYO SURROUNDING REGION peptides(CLE),are known to regulate the formation and development of nitrogen-ﬁxing nodules in *** meristem growth factor(RGF)peptides from Medicago truncatula not only regulate root develop-ment but also modulate nodulation symbiosis with Sinorhizobium ***,the impact of RGF peptides from one leguminous species on the others remains *** this study,we investigate the effects of the RGF family peptide MtRGF6p from *** on nodulation symbiosis and root development in Lotus *** MtRGF6 gene is predominantly expressed in the root nodules of *** and shows low identity with RGF homologous genes from *** gene promoter is active in the primordia of root nodules and lat-eral roots,as well as in young nodules and roots,and the meristem,infection,and nitrogen-ﬁxing regions of the mature *** synthesized MtRGF6p promoted primary root growth in *** but sup-pressed the growth of *** primary *** peptide negatively affected the initiation of nodule primor-dia,the formation of infection threads,and nodulation in both legumes,with a low dosage showing effects on *** compared to *** results suggest that the MtRGF6 peptide from *** may serve as an inter-species signal affecting the root organ development of ***.

关键词： Peptide RGF legume symbiotic nodulation lateral root

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大类培养下“地质学基础”课程实践教学探索

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科教导刊 2023年第10期 110-112页

作者：宫伟戴黎明邢军辉中国海洋大学海洋地球科学学院山东青岛266100

“地质学基础”是地球信息科学与技术等本科专业的重要基础专业课程,而实践教学探索则是“六卓越一拔尖”计划2.0建设的重要内容。文章在分析中国海洋大学地球信息科学与技术专业“地质学基础”的教学现状基础上,提出以“地震研究”为... 详细信息

“地质学基础”是地球信息科学与技术等本科专业的重要基础专业课程,而实践教学探索则是“六卓越一拔尖”计划2.0建设的重要内容。文章在分析中国海洋大学地球信息科学与技术专业“地质学基础”的教学现状基础上,提出以“地震研究”为切入点的实践教学思路,列举以“郯庐大地震”为例的诸多优势,并提出几点具体的实践教学实施步骤。

关键词：地球信息科学与技术地质学基础实践教学地震研究

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离心式铁磁流体微泵的设计及流动特性分析

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哈尔滨工业大学学报 2024年第4期56卷 137-147页

作者：李望旭李正贵韩伟行怡帆谭善文司国雷陈君辉兰州理工大学能源与动力工程学院兰州730050 流体及动力机械教育部重点实验室(西华大学) 成都610039 四川航天烽火伺服控制技术有限公司成都611130

铁磁流体微泵由于其自润滑性和自密封性,使其更加符合微流控技术应用在生物医学、生命科学、化学分析、航空航天等领域的需求,而在目前的结构设计中无法同时满足加工简单、可靠性高、流动稳定等优势,因此限制其应用及发展。为提高铁磁... 详细信息

铁磁流体微泵由于其自润滑性和自密封性,使其更加符合微流控技术应用在生物医学、生命科学、化学分析、航空航天等领域的需求,而在目前的结构设计中无法同时满足加工简单、可靠性高、流动稳定等优势,因此限制其应用及发展。为提高铁磁流体微泵的可靠性和稳定性,促进其发展和应用,本研究基于铁磁流体的外场控制原理、磁流变效应及介质流体的流体力学行为设计了一种离心式的新型铁磁流体微泵,并应用数值计算分析了介质流体流动特性。结果表明:该微泵可以有效实现泵送过程,当转速为10 r/min时,一个周期内的泵送净流量可达0.07 kg/T,且在两股铁磁流体的交替作用下可以阻断泵腔进口与出口的介质流体质量交换;由于铁磁流体与泵腔结构的动静干涉作用,导致出口流量存在轻微脉动(数量级为10^(-5)),但仍处于层流状态(Re<1),并且由于惯性力与特征尺寸相关而黏滞力与特征尺寸无关等力学因素,导致泵送动力对出口尺寸长度非常敏感,在转速4 r/min、出口段长度9 mm时无法实现有效泵送。同时对铁磁流体与泵送介质流体之间的相界面压力波动和自密封性能进行分析,得到相界面上的压力波动峰值远小于铁磁流体自密封性能,相差3个数量级,从铁磁流体的密封稳定性和界面稳定性角度验证了离心式铁磁流体微泵的可行性。

关键词：铁磁流体微泵惯性驱动泵送过程重叠网格

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基于麦克斯韦方程的交变电流长螺线管磁场

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强激光与粒子束 2015年第12期27卷 156-161页

作者：蔡伟伍樊成杨志勇侯雨果邢俊晖第二炮兵工程大学兵器发射理论与技术国家重点学科实验室西安710025

为了分析方波驱动长螺线管内磁场畸变机理,利用麦克斯韦方程研究了螺线管内外的磁场分布情况。首先,利用麦克斯韦方程,分别建立了正弦波驱动螺线管内外电场、磁场模型,并结合安培环路定律和电磁感应定律选取了合适的边界条件,得到了正... 详细信息

为了分析方波驱动长螺线管内磁场畸变机理,利用麦克斯韦方程研究了螺线管内外的磁场分布情况。首先,利用麦克斯韦方程,分别建立了正弦波驱动螺线管内外电场、磁场模型,并结合安培环路定律和电磁感应定律选取了合适的边界条件,得到了正弦波驱动长螺线管的磁场分布;其次,通过傅里叶变换将方波信号变换为多个正弦信号叠加的形式,从而得到了方波驱动长螺线管磁场分布;最后,通过仿真试验重点分析了方波驱动信号频率对磁场的影响,并得出结论:方波驱动长螺线管磁场波形会失真、畸变,驱动信号频率较低、距离螺线管轴线距离较近处,磁场的方波特性较好。

关键词：长螺线管磁场分析麦克斯韦方程傅里叶变换

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黑龙江省森林植物园固碳释氧及降温增湿效益

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东北林业大学学报 2008年第11期36卷 39-40,47页

作者：栗辉刘晓东邢军会东北林业大学哈尔滨150040 黑龙江省科学院自然资源研究所

以黑龙江省森林植物园为研究对象,分别在3个月份测定了森林植物园和市区几个代表性样点的空气中的CO2浓度、空气的温湿度。结果表明:在5、7、9月份,森林植物园内空气中的平均CO2的体积分数为378×10-6,低于城市区3个月份的平均值399×10... 详细信息

以黑龙江省森林植物园为研究对象,分别在3个月份测定了森林植物园和市区几个代表性样点的空气中的CO2浓度、空气的温湿度。结果表明:在5、7、9月份,森林植物园内空气中的平均CO2的体积分数为378×10-6,低于城市区3个月份的平均值399×10-6;3个月份内森林植物园的环境平均温度比市区平均低2～4℃,空气的相对湿度比市区高6.2%～14.2%。森林植物园的热辐射强度平均比市区低达2倍,是哈尔滨市的"天然绿色空调"。

关键词：黑龙江省森林植物园固碳释氧降温增湿

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