渤海、北黄海现代沉积中活体有孔虫分布及其环境意义

发布时间：2018-06-29 04:27

本文选题：渤海 + 北黄海　；参考：《中国海洋大学》2014年硕士论文

【摘要】：本文主要进行了两方面的研究工作。第一，对取自基金委2012年渤海北黄海综合考察公共航次期间，不同季节春季（5月）的50个和秋季（11月）46个渤海北黄海表层沉积物样品中的底栖有孔虫进行了定性定量分析，讨论了不同季节活体底栖有孔虫群落的属种组成，活体群、尸积群底栖有孔虫的分布特征，活体有孔虫在不同季节的分布的范围，以及活体有孔虫与尸积群有孔虫在属种和分布上的差异。结合RDA（冗余分析）对春秋两季活体有孔虫及其生活环境参数如温度、盐度、水深、浊度、叶绿素、溶解氧等参数进行了排序分析，进一步探讨了活体有孔虫与其生活环境参数之间的直接关系。得出（1）活体有孔虫季节性变化很大，表现在丰度高值区的分布、组合方面春秋季上的差异，主要是受生活环境因素影响，活体有孔虫对其生活的环境异常敏感，对短时期的环境变化有明显的指示作用。（2）利用RDA对活体有孔虫与其生活环境参数的相关性对比后发现，在春季A.tasmanensis, N.stella和Bulimina sp.与深度、密度和盐度呈正相关，与叶绿素含量呈负相关。B.frigida和V.advena和溶解氧呈正相关，与水温呈负相关。C. subincertum与浊度和水温呈正相关，与溶解氧含量呈负相关。V.advena与海水盐度有明显的正相关。P.tuberculatum和A.beccarii vars.与海水盐度呈负相关。在秋季，活体P. tuberculatum组合范围扩大，C. subincertum和P. tuberculatum组合范围缩小。在春季，生活在辽东半岛南部沿岸的活体优势种有孔虫B. frigida组合，在秋季被V. advena组合所替代。底栖有孔虫属种季节性的变化是对渤海北黄海多种环境因素如水温、盐度、浊度、溶解氧、以及在秋冬季加剧入侵的黄海暖流等综合因素的反应。（3）在使用尸积群有孔虫还原古环境的过程中，要考虑部分胶结壳有孔虫在埋藏过程中壳体可能会破损、溶解，尤其是在恢复渤海北黄海古环境时，，要充分考虑如V. advena、Trochammina sp.、Ammoscalaria sp.和P. asiatica等胶结壳有孔虫在尸积群中的遗失，否则会低估了这些胶结壳属种指示环境的能力。第二，对2012年5月分别取自渤海的B42站和北黄海的B24站的两根短柱进行高精度取样分析，包括底栖有孔虫的属种鉴定、组合划分、以及沉积物粒度分析、210Pb测年，结合短柱中有孔虫属种、组合划分，优势属种活体在研究区的分布情况，以及RDA结果，对研究区（渤海、北黄海）近几十年海洋环境变化进行讨论。
[Abstract]:This paper mainly carries on two aspects of research work. Firstly, the benthic foraminifera in 50 samples of surface sediments of Huang Hai in spring (May) and 46 samples in autumn (November) in North Bohai Sea during the comprehensive Huang Hai survey of the North Bohai Sea in 2012 were analyzed qualitatively and quantitatively. The genera and species composition of living benthic foraminifera community in different seasons, the distribution characteristics of living benthic foraminifera and the distribution range of living foraminifera in different seasons were discussed. And the difference between foraminifera and foraminifera in species and distribution. Combined with RDA (redundancy analysis), the living environment parameters such as temperature, salinity, water depth, turbidity, chlorophyll, dissolved oxygen and so on of foraminifera in spring and autumn were analyzed. The direct relationship between the living foraminifera and its living environment parameters was further discussed. The main results are as follows: (1) the seasonal variation of living foraminifera is very large, which is manifested in the distribution of high abundance areas. The differences in combination in spring and autumn are mainly affected by living environment factors, and the living foraminifera are extremely sensitive to their living environment. (2) the correlation between living foraminifera and its living environment parameters was compared with RDA. It was found that A. tasmanensis, N. stella and Bulimina sp. in spring. It was positively correlated with depth, density and salinity, negatively correlated with chlorophyll content. B.frigida, V.advena and dissolved oxygen, and negatively correlated with water temperature. C. subincertum was positively correlated with turbidity and water temperature. There was a significant positive correlation between V. advena and seawater salinity. P. tuberculatum and A.beccarii vars. There was a negative correlation between salinity and salinity. In autumn, the range of live P. tuberculatum assemblages was enlarged, and the range of C. subincertum and P. tuberculatum combinations was reduced. In spring, the dominant foraminifera, B. frigida, which lives along the southern coast of the Liaodong Peninsula, was replaced by the V. advena combination in autumn. The seasonal variation of benthic foraminifera species is related to many environmental factors such as water temperature, salinity, turbidity, dissolved oxygen in Huang Hai in the northern Bohai Sea. And the reaction of the combined factors such as the Huang Hai warm current, which aggravated the invasion in autumn and winter. (3) in the process of reducing paleoenvironment by foraminifera, it is necessary to consider that some of the cemented shell foraminifera may be damaged and dissolved during burial. Especially in the restoration of the Huang Hai paleoenvironment in the northern Bohai Sea, such as V. advena Trochammina sp. Ammoscalaria sp. should be taken into account. The loss of cemented shell foraminifera, such as P. asiatica, in the aggregates would underestimate the ability of these cementitious shell species to indicate the environment. Secondly, the high-precision sampling analysis of two short columns taken from B42 station in Bohai Sea and B24 station in North Huang Hai in May 2012 was carried out, including the identification of benthic foraminifera, assemblage classification, and sediment granularity analysis (210Pb) dating. Combined with foraminifera species, assemblage and distribution of dominant genera in the study area, and the results of RDAs, the marine environmental changes in the study area (Bohai Sea, North Huang Hai) in recent decades were discussed.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：Q915;P736.22

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