本文關(guān)鍵詞：渤海灣近岸海底表層硅藻的組合特征及其沉積環(huán)境　出處：《天津師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 硅藻分析 粒度 渤海 沉積環(huán)境

【摘要】：以渤海西側(cè)的天津?yàn)撑c渤海東側(cè)的復(fù)州灣淺海區(qū)為研究對象,分別對天津?yàn)?0個(gè)表層沉積物樣品與復(fù)州灣8個(gè)表層沉積物樣品的進(jìn)行了硅藻分析。查明了表層沉積硅藻組成、優(yōu)勢種及組合的分布特征。并結(jié)合樣品所處地貌與粒度特征,明確了研究區(qū)域的沉積環(huán)境,探討了河流與環(huán)流對硅藻組合與沉積環(huán)境的影響。對復(fù)州灣8個(gè)不同地點(diǎn)表層沉積物樣品的硅藻種屬百分含量做聚類分析,將硅藻劃分為 4 組:Ⅰ 組主要硅藻組合為 Paralla sulcate-Biddulphia aurita-Rhaphoneis surirella;Ⅱ組主要硅藻組合為Paralla sulcate-Coscinodiscus excentrcus-Cyclotella stylorum;Ⅲ組主要硅藻組合為Coscinodiscus radiates-Cyclotella stylorum;Ⅳ 組主要硅藻組合為Paralla sulcate-Coscinodiscus radiates-Coscinodiscus excenrcus。結(jié)合粒度分析與地貌特征得出:Ⅰ組大體為受河流影響較小內(nèi)灣環(huán)境;Ⅲ組為受河流影響較小的近岸基巖環(huán)境;Ⅱ組與Ⅳ組為受河流影響相對較強(qiáng)的內(nèi)灣環(huán)境。對天津?yàn)?0個(gè)不同地點(diǎn)表層沉積物樣品的硅藻種屬百分含量做聚類分析,將硅藻劃分為 4 組:Ⅰ 組主要硅藻組合為Coscinodiscus radiates-Coscinodiscus excentrcus-Cyclotella stylorum;Ⅱ 組主要硅藻組合為 Coscinodiscus radiates-Cyclotella stylorum-Coscinodiscus excentrcus;Ⅲ組.硅藻組合為 Coscinodiscus excentrcus-Coscinodiscus radiates-Coscinodiscus lineatus;Ⅳ組硅藻組合為 Paralla sulcate-Coscinodiscus excentrcus-Coscinodiscus lineatus。結(jié)合粒度與地形資料探討得出:I組為受河流作用較少的內(nèi)灣環(huán)境;Ⅱ組為受河流作用的內(nèi)灣環(huán)境;Ⅲ組為受河流作用較大的內(nèi)灣環(huán)境;IV組為受河流作用較大的河口內(nèi)灣環(huán)境。天津?yàn)撑c復(fù)州灣外洋種硅藻 Dictycha fibula、Thalassiosira nizschioides、Coscinodiscus屬與Actinocyclus屬的百分含量差異較大。復(fù)州灣所有外洋種平均百分含量的總和僅為37.65%,而天津?yàn)硡s高達(dá)74.01%,表明天津?yàn)撑c外洋水體有更好的連通性,與兩地海底地形差異相符。在復(fù)州灣含淡水種硅藻的樣點(diǎn)中,發(fā)現(xiàn)的淡水硅藻種類與數(shù)量都較少,僅發(fā)現(xiàn)Epithemia turgida,Melosira granulata,Tabellaria fenestrata。而天津?yàn)澈N硅藻的樣點(diǎn)中,發(fā)現(xiàn)的淡水硅藻種類與數(shù)量都較前者多,其中發(fā)現(xiàn)的淡水種硅藻有:Epithemia hyndmanii,Gyrosigma acuminatum,Melosira granulata,Navicula cryptotenella,Navicula mediocostata,Surirella fastuosa,Syedra ulna,Tabellaria fenestrata。復(fù)州灣能發(fā)現(xiàn)由復(fù)州河河水入海時(shí)經(jīng)過湖沼時(shí)帶入海區(qū)的湖沼環(huán)境普通種Epithemia turgida,而在天津?yàn)扯螀s沒鑒定出。雖然同為內(nèi)灣環(huán)境,但兩岸淡水種硅藻差異巨大。表明兩區(qū)域海區(qū)淡水種硅藻來源有區(qū)別,受附近入海河流影響明顯。
[Abstract]:Based on the Tianjin Bay on the west side of Bohai and the Fuzhou Bay shallow sea area on the east side of Bohai, 40 diatomite samples from Tianjin Bay and 8 surface sediments from Fuzhou bay were analyzed. The distribution characteristics of the composition, dominant species and assemblage of the surface deposited diatom were found out. Combined with the features of the geomorphology and granularity of the samples, the sedimentary environment of the study area was clarified, and the effects of rivers and circulation on the diatom assemblage and sedimentary environment were discussed. Analysis of the species percentage of cluster Fuzhouwan at 8 different locations in surface sediment samples, diatoms are divided into 4 groups: group I Paralla sulcate-Biddulphia aurita-Rhaphoneis for the main diatom assemblages of Surirella; group II Paralla sulcate-Coscinodiscus excentrcus-Cyclotella as the main diatom assemblage stylorum; group III Coscinodiscus radiates-Cyclotella stylorum as the main diatom assemblage; IV group Paralla sulcate-Coscinodiscus radiates-Coscinodiscus excenrcus for diatom assemblages. Combined with particle size analysis and geomorphologic characteristics, I concluded that group I is generally less affected by rivers than inner bay environment. Group III is a nearshore bedrock environment which is less affected by rivers. Group II and group IV are relatively inshore environments with relatively strong River influence. Analysis of the species percentage do clustering on the Gulf of Tianjin at 40 different locations in surface sediment samples, diatoms are divided into 4 groups: group I Coscinodiscus radiates-Coscinodiscus excentrcus-Cyclotella for the main diatom assemblages of stylorum; group II Coscinodiscus radiates-Cyclotella stylorum-Coscinodiscus as the main diatom assemblage excentrcus; III group. Coscinodiscus excentrcus-Coscinodiscus radiates-Coscinodiscus lineatus diatom assemblages of diatoms in group IV; Paralla sulcate-Coscinodiscus excentrcus-Coscinodiscus lineatus combination. Combined with grain size and topographic data, it is concluded that group I is an inner bay environment with less action by rivers, group II is an inner bay environment with river action, and group III is an inner bay environment with larger rivers. IV group is an estuarine environment with large river action. The Gulf of Tianjin and Fuzhouwan overseas Dictycha fibula, Thalassiosira nizschioides, diatoms and Coscinodiscus are differences in content and Actinocyclus is larger. The sum of Fuzhouwan all overseas average percentage is only 37.65%, while the Tianjin Bay was as high as 74.01%, shows that the connectivity is better in Tianjin bay with the overseas water, consistent with the two different terrain. The species and quantity of freshwater diatoms found in Fuzhou Bay freshwater diatom samples are less. Only Epithemia turgida, Melosira granulata, Tabellaria fenestrata are found. The samples of Tianjin bay with freshwater diatoms in freshwater diatoms found in species and quantity than the former, which found that the freshwater diatoms are: Epithemia hyndmanii, Gyrosigma acuminatum, Melosira granulata, Navicula cryptotenella, Navicula mediocostata, Surirella fastuosa, Syedra ulna, Tabellaria fenestrata. Fuzhouwan can be found by Fuzhouhe River into the sea through the lake with the sea area of lake environment common species in the Gulf of Tianjin and Epithemia turgida, was not identified. Although it is the same as the inner bay environment, there are great differences in freshwater diatom on both sides of the Taiwan Straits. It shows that there are different sources of freshwater diatom in the two regional sea area, which are obviously affected by the rivers near the sea.
【學(xué)位授予單位】：天津師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：Q949.27

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本文編號：1346606