搜索到324篇“ BIOTURBATION“的相关文章
Bioturbation Patterns in the Modern Subaqueous Yellow River Delta and Their Implication for Sedimentary Environment Changes
2024年
Bioturbation is one of the important processes that affect the structure and function of sedimentary environments.The particle mixing and element migration processes caused by bioturbation can interfere with the circulation of matter and the explanation of sedimentary records.Therefore,the quantitative characterization of bioturbation structures in the sedimentary sequence is of great significance in the field of sedimentology.Estuaries,where fresh and saltwater mix,exhibit high ecological heterogeneity and biodiversity,making them ideal places to explore bioturbation.This paper targets the subaqueous Yellow River Delta to quantitatively characterize bioturbation structures and their spatial distribution patterns using computed tomography(CT)scanning and three-dimensional reconstruction technology.By combining sediment characteristics and sedimentary environment analysis,the main factors affecting bioturbation structures are elucidated.The results show that bioturbation structures in the subaqueous Yellow River Delta can be divided into four types based on their morphology:uniaxial type,biaxial type,triaxial type,and multiaxial type.Skolithos,Palaeophycus in the uniaxial type,and Thalassinoides in the multiaxial type are the most developed structures.Different types of bioturbation may be constructed by trace-making organisms belonging to the same category or functional group.The intensity of bioturbation in this area ranges from 0 to 4%,with a decreasing trend from nearshore to offshore.There is a downward decreasing trend in the intensity of bioturbation overall in the sedimentary cores,with three vertical distribution patterns:exponential decay pattern,fluctuating decay pattern,and impulsive pattern.The impulsive pattern of bioturbation in a core may indicate the abrupt change in sedimentary environment induced by the Yellow River channel shift in 1996.These results suggest that factors affecting the development of bioturbation include grain size,porosity,consolidation,organic matter content of sediments,and s
LIU XiaohangFAN DejiangZHANG XinZHANG Wei
Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific
2024年
The biogeochemical processes of marine sediments are influenced by bioturbation and organic carbon decomposition,which is crucial for understanding global element cycles and climate change.Two sediment cores were acquired in 2017 from abyssal basins in the central-eastern tropical Pacific to determine the bioturbation and organic carbon degradation processes.The radioactivity concentrations of 210Pb and 226Ra in the sediment cores were measured,indicating the presence of significant excess 210Pb(210Pbex)signals in the sediment cores.Besides,a manganese nodule was discovered in one core,which had a substantial influence on the distribution of 210Pbex.With the exception of this anomalous finding,the bioturbation coefficients in the remaining core were estimated to be 10.6 cm^(2)/a using a steady-state diffusion model,greater than most of the deep-sea sediments from the equatorial eastern Pacific.By using a bio-diffusion model,we further calculated the degradation rates of organic carbon(8.02 ka-1),which is also higher than other areas of the Pacific.Our findings displayed the presence of a biologically active benthic ecosystem in the central-eastern tropical Pacific.
Feng LinCai LinXiuwu SunHui LinLi LinFangfang DengKaiwen TanPeng Lin
关键词:226RABIOTURBATION
鲤Cyprinus carpio生物扰动对养殖池塘底质甲烷生成的影响及其微生物学机制
2024年
为研究鲤Cyprinus carpio生物扰动作用对池塘底质甲烷生成的影响机制,通过室内模拟实验,测定了底质产甲烷潜力、产甲烷菌生物群落组成及产甲烷菌群间的互作效应。结果显示,与对照组相比,鲤扰动组底质产甲烷潜力显著降低,鲤的生物扰动作用促使底质总细菌和总古菌丰度显著升高,而产甲烷功能基因mcrA的丰度显著降低。养殖池塘底质产甲烷功能菌优势菌群主要为Methanobacterium、Methanothrix、Methanoregula和Methanocella,鲤的生物扰动作用改变了产甲烷功能菌的群落结构组成和产甲烷途径,使得产甲烷菌属间共生网络平均度和连接数显著降低,模块化更高,共生网络关系变得更为简单且以负相关种间竞争关系共存。Pearson相关性分析表明,底质氧化还原电位是影响mcrA基因丰度和产甲烷菌群结构的关键环境因子。鲤的生物扰动作用可能通过提升底质氧化还原电位,降低产甲烷功能菌群丰度和种间互作而降低底质甲烷产生潜力。
刘洪达陈燕田照辉徐绍刚吴兆星陈文超王卓楠齐遵利潘哲
关键词:底质生物扰动产甲烷菌
鄂尔多斯盆地东部奥陶系马四段生物扰动构造形成的群落古生态及其对储层发育的控制
2024年
鄂尔多斯盆地奥陶系马家沟组四段马四段形成于最大海侵(海泛)沉积期,属于正常海相沉积环境,海洋生物极其繁盛,在碳酸盐沉积物(尤其是灰泥沉积物)中形成了较为强烈的生物扰动构造。依据近年来盆地内部大量的探井取芯和盆地东缘野外露头地质剖面的综合研究,系统分析了盆地东部马四段的生物扰动构造(遗迹化石)及可能的群落古生态特征,并探讨了生物扰动对于岩石储层发育的控制作用,形成以下主要认识。①马四段生物扰动构造具有普遍性发育的特点,突出表现在大部分层段纵向上连续地发育生物扰动和在横向上广泛分布,表明在其沉积发育的整个过程中底栖生物群落异常活跃,呈现为在较长的地史时期内“生生不息”、不间断地延续着的一种基本相似的生活、生命及生态场景。②本区马四段生物扰动构造类型多样,结合生物扰动构造(遗迹化石)的化石碎片门类鉴定与埋藏学分析认为本区马四段强烈的生物扰动构造主要是由蠕型动物、腹足类、三叶虫及介形类等所为;再结合岩石微相的研究,可将本区马四段划分为5个典型的古生物群落(群落古生态)类型,其演进次序也依次代表了海平面变浅旋回中的古生态环境(沉积环境)演化从早期开阔广海到末期潮上云坪藻席的主要阶段。③本区马四段广泛发育的生物扰动为选择性白云石(岩)化提供了基础条件,也为储层孔隙的形成和有效保持提供了基本保障,进而间接地控制了有效储层的发育。
包洪平魏柳斌张立军师平平王前平王前平
关键词:鄂尔多斯盆地马家沟组生物扰动
华北板块南缘寒武系苗岭统碳酸盐岩硬底:缺乏生物扰动背景下的早期海底胶结作用
2024年
华北地台南缘寒武系苗岭统碳酸盐岩硬底发育在核形石灰岩和鲕粒灰岩之上,并明显截断下伏的碳酸盐沉积物。本文通过对硬底界面之下颗粒间的放射纤维状方解石胶结物和等厚环边的微晶胶结物分析,表明其形成于早期海底胶结作用,该时期早期胶结区靠近沉积物—水界面,易受潮汐和波浪冲刷而暴露海底,并在持续搅动的高能环境中经历磨蚀和平整,形成硬底。由于硬底形成后几乎没有受到强烈改造和持续生物侵蚀的影响,通常表现出简单、平坦的表面形态。研究区馒头组二段含硬底层段形成于低、高能交替的潮间—潮下水道环境,以微晶方解石为主要的胶结剂沉淀;张夏组含硬底层段形成于台内鲕粒滩高速建造期,以物理化学沉淀和早期海底胶结作用为主。研究区出现的硬底表明,该时期海水化学条件和海底生态环境利于碳酸盐沉积物的早期胶结。硬底作为早期海底胶结作用的突出证据,对于研究碳酸盐沉积物的早期成岩作用及岩化特征具有重要意义,其形成过程及成因也为古海洋化学条件和底栖生态系统的变化提供了主要依据。
代明月尹忠雷齐永安韩兰兰陈松华卿诗韵
关键词:华北地台
The influence of bioturbation on sandy reservoirs: the delta front sand of the lower Zhujiang Formation, Baiyun Depression, Zhujiang River Mouth Basin
2023年
Ichnofossils are well developed in clastic rock reservoirs in marine and transitional facies, which can considerably change the physical properties of the reservoir. However, this influence is not well understood, raising an important problem in the effective development of petroleum reservoirs. This paper analyzes continental shelf margin delta reservoirs through core observation, cast thin section observation and reservoir physical property test. Some important scientific insights are obtained:(1) The presence of Cruziana ichnofacies, including Asterosoma, Ophiomorpha, Planolites, Skolithos, Thalassinoides, and other ichnofossils can be used to identify in subaqueous distributary channels, subaqueous levee, frontal sheet sand, abandoned river channels, crevasse channels, main channels and channel mouth bars. Considerable differences in the types of ichnofossils and the degree of bioturbation can be observed in the different petrofacies.(2) Ichnofossils and bioturbation play a complex role in controlling reservoir properties. The reservoir physical properties have the characteristics of a decrease–increase–decrease curve with increasing bioturbation degree. This complex change is controlled by the sediment mixing and packing of bioturbation and the diagenetic environment controlled by the ichnofossils.(3) Sea-level cycle changes affect the modification of the reservoir through sediment packing. Bioturbation weakens the reservoir's physical property when sea level slowly rises and improves the reservoir's physical property when base level slowly falls.
Zhifeng XingWei WuJuncheng LiuYongan QiWei Zheng
关键词:BIOTURBATION
大型底栖动物扰动对红树林微生物群落的影响
2023年
大型底栖动物的生物扰动作用是促进红树林生态系统物质转化和能量流动的重要过程。大型底栖动物可以改变沉积物理化性质,驱动微生物群落结构组成和功能,对红树林中的生物地球化学循环过程具有重要意义。本文聚焦红树林大型底栖动物生物扰动和其对微生物群落、微生物介导的生物地球化学循环影响的研究现状,分别综述了大型底栖动物和微生物的时空分布格局和影响因素,探讨了大型底栖动物扰动对红树林微生物生态功能调控的物理和化学关联,展望了大型底栖动物-微生物-红树林在群落组成、互作机制和生态功能上的研究前景。
彭逸生杨玉婷梁晋胡博文刘建新何姿莹
关键词:红树林大型底栖动物微生物群落生物扰动生物地球化学循环
三叠纪末生物大灭绝期间初始海洋生物扰动事件与甲烷释放之间的关系
2023年
对羌塘盆地温泉剖面进行了有机碳同位素的测定,并且对比了同期全球其他剖面的数据,得出有机碳同位素的变化主要受到二氧化碳和甲烷等温室气体浓度的影响。这些温室气体可能与中大西洋大火成岩省相关的火山活动有关,这些火山运动造成了洋底甲烷水合物释放出大量的甲烷和二氧化碳,从而改变了三叠纪-侏罗纪过渡时期的古气候,并且引起了晚三叠世生物集群式灭绝中的初始生物扰动事件。
王莹付修根
关键词:羌塘盆地生物大灭绝甲烷
长江口及邻近海域现代生物扰动构造定量表征及影响因素
2023年
生物扰动构造是表征海底环境状态的重要指标,是古沉积环境重建的主要依据,且它影响沉积物早期成岩作用以及物质的再分配,成为百年尺度沉积记录解读的干扰因素。本文基于长江口及其邻近海域的21个站位的沉积物岩心,利用高分辨X射线计算机断层扫描技术,通过matlab的数据处理,定性和定量表征了该区生物扰动构造,分析了影响生物扰动构造的主要因素。研究表明:长江口及邻近海域生物扰动构造较为发育,从功能上划分为生物扩散构造、运输构造、交换构造和廓道扩散构造4种类型,运输构造和廓道扩散构造常见;生物扰动构造在岩心中分布形式多样,包括指数衰减型、波动衰减型、均匀分布型、脉冲分布型等垂向分布形式;扰动深度深浅不一,多数在20cm以内,但也有超过40cm者;生物扰动构造空间上不均一,长江口及内陆架较发育,扰动构造体积在0~13972mm^(3)之间,而苏北沿岸、中陆架则较少,扰动构造体积在351~3212mm^(3)之间,从岸向外生物扰动构造有减少趋势。生物扰动构造发育程度主要受底质类型、沉积速率制约,黏土质粉砂以及适宜的沉积速率(0.52~1.34cm/a)有利于生物扰动构造发育和保存。
张鑫范德江程鹏刘晓航郑世雯
关键词:长江口及邻近海域生物扰动构造三维重建影响因素
生物扰动对镧系锁磷剂控磷效能的影响
2023年
选取2种富营养化湖泊的优势底栖动物—黄色羽摇蚊(Chironomus flaviplumus)和苏式尾鳃蚓(Branchiura sowerbyi),通过微宇宙实验研究底栖动物对沉积物磷释放、镧系锁磷剂(LMB)控磷效能和LMB的镧(La)溶出及其生态风险.结果表明,未添加LMB时,摇蚊显著增加了内源磷释放,而苏式尾鳃蚓的影响则不显著;投加LMB后,黄色羽摇蚊和苏式尾鳃蚓对LMB控磷效能均有显著负面影响,其上覆水磷酸盐(PO_(4)^(3-))浓度分别是对照组的2.50和2.23倍;LMB施用期间,生物扰动作用显著降低了上覆水中La浓度;且结果显示La在底栖动物生物体内富集.
姚婧梅谭秋君史思捷韩乐智悦
关键词:内源磷底栖动物生物扰动

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房岩
作品数:112被引量:392H指数:13
供职机构:长春师范大学
研究主题:水田 生物扰动 扰动效应 可持续发展 泥鳅
孙刚
作品数:220被引量:1,441H指数:20
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丛大力
作品数:5被引量:22H指数:3
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汪爱武
作品数:10被引量:10H指数:2
供职机构:长春教育学院
研究主题:科学教育 扰动效应 水田 生物扰动 沉积物
董刚
作品数:2被引量:16H指数:2
供职机构:长春师范学院生命科学学院
研究主题:沉积物 泥鳅 水田 生物扰动 FIELD