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化石硅藻    
相关语句
  fossil diatom
    Tentative Application of the CLSM Technique to the Study of Fossil Diatom Microstructure
    CLSM技术应用于化石硅藻微构造的尝试研究
短句来源
    In the present paper, one new fossil diatom species, Geissleria jianghanensis sp. nov. Li, is described.
    在对江汉平原钻孔中属晚更新世地层的化石硅藻进行鉴定时,发现1个新种:Geissleria jianghanensis sp.nov.
短句来源
    FOSSIL DIATOM STUDIES IN PALEOLIMNOLOGY: DEVELOPMENTS SINCE THE 1980 :
    古湖沼学中的化石硅藻——80年代以来研究进展
短句来源
  fossil diatom
    Tentative Application of the CLSM Technique to the Study of Fossil Diatom Microstructure
    CLSM技术应用于化石硅藻微构造的尝试研究
短句来源
    In the present paper, one new fossil diatom species, Geissleria jianghanensis sp. nov. Li, is described.
    在对江汉平原钻孔中属晚更新世地层的化石硅藻进行鉴定时,发现1个新种:Geissleria jianghanensis sp.nov.
短句来源
    FOSSIL DIATOM STUDIES IN PALEOLIMNOLOGY: DEVELOPMENTS SINCE THE 1980 :
    古湖沼学中的化石硅藻——80年代以来研究进展
短句来源
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  fossil diatom
Fossil diatom algae first found in the Paleogene marine succession (Alugivayam Formation) of the Il'pinskii Peninsula, northeastern Kamchatka are studied, and new data on molluscan assemblages from the same sequences are presented.
      
Fossil diatom assemblages preserved within the sedimentary record in Arctic lakes provide the potential to reconstruct past changes in important limnological variables.
      
Sediment records can be disturbed by erosional and redepositional events, which redeposit microfossils within a basin and may then lead to misinterpretations of fossil diatom assemblages.
      
Consequently, the fossil diatom data can be used to establish a continuous record of past climate variability over approximately the past 1300?years.
      
It has been thoroughly documented by the gradual change in the composition of the fossil diatom floras.
      
更多          
  fossil diatoms
Fossil diatoms from the Milky River Formation of the Sandy Ridge section, Alaska Peninsula are analyzed.
      
The reconstructive TP level and the inference of aquatic plants from fossil diatoms in different lakes, as well as their comparison provide a scientific basis for ecological restoration of eutrophic lakes in research regions.
      
Effect of fossil diatoms on the growth of two syngeneic murine leukemias
      
The effect of micronized frustules of fossil diatoms (DS) on tumor growth and survival of mice receiving an ip inoculations of either a spontaneous lymphoblastic leukemia (LB) or P-388 lymphocytic leukemia (P-388) was investigated.
      
Inhibition of experimental autoimmune orchitis by fossil diatoms
      
更多          
  fossil diatom
Fossil diatom algae first found in the Paleogene marine succession (Alugivayam Formation) of the Il'pinskii Peninsula, northeastern Kamchatka are studied, and new data on molluscan assemblages from the same sequences are presented.
      
Fossil diatom assemblages preserved within the sedimentary record in Arctic lakes provide the potential to reconstruct past changes in important limnological variables.
      
Sediment records can be disturbed by erosional and redepositional events, which redeposit microfossils within a basin and may then lead to misinterpretations of fossil diatom assemblages.
      
Consequently, the fossil diatom data can be used to establish a continuous record of past climate variability over approximately the past 1300?years.
      
It has been thoroughly documented by the gradual change in the composition of the fossil diatom floras.
      
更多          
  fossil diatoms
Fossil diatoms from the Milky River Formation of the Sandy Ridge section, Alaska Peninsula are analyzed.
      
The reconstructive TP level and the inference of aquatic plants from fossil diatoms in different lakes, as well as their comparison provide a scientific basis for ecological restoration of eutrophic lakes in research regions.
      
Effect of fossil diatoms on the growth of two syngeneic murine leukemias
      
The effect of micronized frustules of fossil diatoms (DS) on tumor growth and survival of mice receiving an ip inoculations of either a spontaneous lymphoblastic leukemia (LB) or P-388 lymphocytic leukemia (P-388) was investigated.
      
Inhibition of experimental autoimmune orchitis by fossil diatoms
      
更多          


According to 107 dating data including 9 kinds of paleosea level indicators which the deposit depth and tectonism correction have done, the sea level change curve in Zhujiang Delta during the past 8000 years, has been drawn. Sea level rose quickly before 6000 years, descended from 6000 years B.P. to 5500 years B.P. rose from 5500 years B.P.to 2800 years B.P., descended from 2800 years B.P.to 2200 years B .P., rose from 2200 years B.P.to 900 years B.P. and descended slightly from 900 years B.P. to 600 years B.P....

According to 107 dating data including 9 kinds of paleosea level indicators which the deposit depth and tectonism correction have done, the sea level change curve in Zhujiang Delta during the past 8000 years, has been drawn. Sea level rose quickly before 6000 years, descended from 6000 years B.P. to 5500 years B.P. rose from 5500 years B.P.to 2800 years B.P., descended from 2800 years B.P.to 2200 years B .P., rose from 2200 years B.P.to 900 years B.P. and descended slightly from 900 years B.P. to 600 years B.P. Each one included several shifts. The sea level change was in accord with the verticalchange of diatoms in core samples,the climate change reflected by sporo-pollen analyses of samples, the deposit periods of sand bar and the changes of ancientculture relics sites

本文对9类古海面标志物的107个样品年代数据进行沉积深度棱正、构造升降幅度校正后,绘出珠江三角洲8000年来海平面变化曲线。珠江三角洲8000年来海平面变化可分为趾今6000年前海平面急剧上升、距今6000—5500年海平面波动下降、距今5500—2800年海平面波动上升、距今2800—2200年海平面波动下降、距今2200—900年海平面波动上升和距今900—600年海平面轻徽下降6个阶段。海平面变化曲线与化石硅藻垂向变化、孢粉反映的气候变化、滨岸沙堤形成期和古文化遗址堆积的变化等有较好的一致性。

The role of fossil diatom study in paleolimnology is to analogize the ancient lakes, reconstruct their lake envirnmental evolution histories and find out lake function and lake variation regularities based upon the distribution, ecology and environmental condition of living diatom flora in modern lakes, and upon some other organic and inorganic indicators and dating data as well. Diatom has become an important tool in paleolimnological studies due to its high abandance, well-preserved frustule, sensitivity to...

The role of fossil diatom study in paleolimnology is to analogize the ancient lakes, reconstruct their lake envirnmental evolution histories and find out lake function and lake variation regularities based upon the distribution, ecology and environmental condition of living diatom flora in modern lakes, and upon some other organic and inorganic indicators and dating data as well. Diatom has become an important tool in paleolimnological studies due to its high abandance, well-preserved frustule, sensitivity to changing environments, wide distribution and uncomplicated identification.Initial researches on paleoenvironments of lacustrine fossil diatoms began at the middle nineteenth century. The subject has being forged rapidly since the 1980s, including 7 major aspects as follows: (1) systematic classification of diatoms, (2) relationship between diatoms and environmental factors, (3) diatoms and lake acidification and eutrophication, (4) diatoms and climatic changes, (5) transfer function between diatoms and water chemistry, (6) influence of reworking and dissolution on diatom distribution, and (7) correlation of diatoms and sedimentary pigments.Fossil diatom studies began rather late in China. There accumulated some research data in the past twenty years , including mainly: (1)fossil diatoms in Tertiary diatomaceous earth deposits, (2) fossil diatoms in plateau lakes in Xizang (Tibet), and (3) Quaternary lacustrine fossil diatoms and environmental changes. guice the academic level is quite lower as compared with the modern international level, The Chinese paleontological and Quaternary geological fields have to strengthen the studies on lacustrine fossil diatoms and their environmental significance.

化石硅藻由于其丰度高、壳体易于保存,对环境变化敏感、分布范围广等特点,已成为古湖沼学研究中的重要研究手段。80年代以来国际上湖泊硅藻研究在以下几方面得到迅速发展:(1)系统分类;(2)与环境因子的关系;(3)湖泊酸化、富营养化;(4)气候变化;(5)转换函数;(6)再沉积作用和溶解作用;(7)与色素对比分析等。我国湖泊化石硅藻研究起步较晚,80年代以来已积累了一些研究资料,近年来此项研究已开始受到重视和加强。

The No. 47 borehole is located at Jiangling County in the Jianghan Plain, Hubei Province, China. There are abundant sedimentary diatoms (about 26 genera and 148 taxa) in the upper section (46.6-2.2m) of the borehole. Most of them belong to the existent freshwater diatoms, being mainly epiphytic, littoral and shallow-water-inhabitant species. Among them some gerera are rich in taxa such as Navicula (28 taxa), Cymbella (23 taxa), Achnanthes ( 15 taxa), Gomphonema (14 taxa) and Eunotia (13 taxa) .The dominant species...

The No. 47 borehole is located at Jiangling County in the Jianghan Plain, Hubei Province, China. There are abundant sedimentary diatoms (about 26 genera and 148 taxa) in the upper section (46.6-2.2m) of the borehole. Most of them belong to the existent freshwater diatoms, being mainly epiphytic, littoral and shallow-water-inhabitant species. Among them some gerera are rich in taxa such as Navicula (28 taxa), Cymbella (23 taxa), Achnanthes ( 15 taxa), Gomphonema (14 taxa) and Eunotia (13 taxa) .The dominant species are Gomphonema tropicale var. nonpuncta-tum, Cyclotella comta, Cocconeis placentula var. lineata and Stephanodiscus dubius, etc. From the lower to the upper section of the sediment, species number (Sp. /strat.) and amount (Ind. /g dry sed.) of the diatoms underwent a change from scantiness to plenty, then gradually decline to final disappearance. The change of the diatoms obviously reflects a paleoenvironmental change of water bodies in this area,i.e. :at the early stage,this area was possibly a river (might have been an obsolete course of the Yangtze River), then it gradually became a side bank in the river, which later turned into a depression retaining water perphaps in the form of a lake or a swamp in a flood plain. Then it gradually became deepened and widened with final disappearance of the retained water. According to the diatom assemblages in different sedimentary phases, it may be inferred that the pH range in these water bodies were basically stable, ranging from neutral (pH = 7) to slightly alkaline (pH>>>>>>>7) .Combining pollen analysis (mainly the pollens of Pinus and Betule) and mineral analysis with diatoms, it might be deduced that the paleoclimate of this area during the period of luxuriant growth of diatoms was somewhat colder than the present time, In the sediment, the amount and species number of the diatoms all significantly correlated with the mean grain size of the sediment.

江汉平原47号钻孔,位于湖北省江汉平原的江陵县,在其上段的46.6-2.2m层位上,有丰富的化石硅藻,约有26属148种,其中绝大多数是现存的淡水种类,并以附生性、沿岸带和浅水性的种类为主。种类较多的属有:Navicula(28种)、Cymbella(23种)、Achnanthes(15种)、Gomphonema(14种)和Eunotia(13种)。主要种类有Gomphonema tropicale var. nonpunctatum、Cyclotella comta、Cocconeis placemula vat. lineata和Stephanodiscus dubius等。硅藻中的种数(种/层)和数量(个/每克干沉积物)经历了一个从无到有、由少到多再逐渐减少直至消失的过程。这反映了水体环境也相应地经历了一个漫长的变迁过程:河流(可能是长江古道)→边滩和河漫滩→泛滥平原的积水洼地(湖泊或沼泽)→水体变深加宽→水体消失。从不同沉积相中各种类型(适酸碱度不同)的硅藻比例(即硅藻种谱),可以推测当时水体的酸碱度的变化不大,在中性或中性偏碱的范围。由化石硅藻并结合孢粉的矿物分析,可以推测当...

江汉平原47号钻孔,位于湖北省江汉平原的江陵县,在其上段的46.6-2.2m层位上,有丰富的化石硅藻,约有26属148种,其中绝大多数是现存的淡水种类,并以附生性、沿岸带和浅水性的种类为主。种类较多的属有:Navicula(28种)、Cymbella(23种)、Achnanthes(15种)、Gomphonema(14种)和Eunotia(13种)。主要种类有Gomphonema tropicale var. nonpunctatum、Cyclotella comta、Cocconeis placemula vat. lineata和Stephanodiscus dubius等。硅藻中的种数(种/层)和数量(个/每克干沉积物)经历了一个从无到有、由少到多再逐渐减少直至消失的过程。这反映了水体环境也相应地经历了一个漫长的变迁过程:河流(可能是长江古道)→边滩和河漫滩→泛滥平原的积水洼地(湖泊或沼泽)→水体变深加宽→水体消失。从不同沉积相中各种类型(适酸碱度不同)的硅藻比例(即硅藻种谱),可以推测当时水体的酸碱度的变化不大,在中性或中性偏碱的范围。由化石硅藻并结合孢粉的矿物分析,可以推测当时硅藻大量生长繁殖时期的水温较凉,气候可能偏冷。硅藻的数量与沉积物的平均粒度呈明显的相关性,硅藻的种数与沉积物的平均粒度也呈明显的相关性。

 
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