本文選題：長江口　切入點(diǎn)：沉積物　出處：《海洋科學(xué)》2017年07期

【摘要】：針對2015年長江口及其鄰近海域所采集的43個表層沉積物樣品,通過粒徑分析以及生物硅(BSi)、總有機(jī)碳(TOC)和總氮(TN)等生源要素參數(shù)的測定,系統(tǒng)探討了長江口表層沉積物粒徑及生源要素的時空分布特征以及各要素的相互關(guān)系。結(jié)果表明:(1)長江口及其鄰近海域表層沉積物組成以黏土質(zhì)粉砂、粉砂質(zhì)砂和砂為主。研究區(qū)域內(nèi),粒徑組成呈現(xiàn)明顯的"南細(xì)、北粗,近岸細(xì)、離岸粗"的分布特征,長江口及浙江近岸泥質(zhì)區(qū)的表層沉積物粒度最細(xì),中值粒徑(Φ)在5以上;(2)調(diào)查海域表層沉積物中BSi含量在0.22%~1.82%之間,沉積物中粉砂、黏土含量及平均粒徑(Φ)均與BSi含量呈顯著正相關(guān)(P0.01),黏土礦物和粉砂較多的細(xì)顆粒沉積物更易累計(jì)和保存BSi;(3)TOC和TN的含量分別在0.04%~1.17%和0.01%~0.26%之間,其分布特征與沉積物中值粒徑(Φ)和BSi的分布也有明顯的正相關(guān)性,說明細(xì)顆粒沉積物更有利于有機(jī)質(zhì)保存,表層沉積物中的硅藻可能是有機(jī)物的來源之一。
[Abstract]:In this paper, 43 surface sediment samples collected in the Yangtze Estuary and its adjacent waters in 2015 were analyzed by particle size analysis as well as the determination of biological elements such as BSiC, TOC (Total Organic carbon) and TNN).The temporal and spatial distribution characteristics of surface sediment particle size and biogenic elements in the Yangtze Estuary and the relationship between them are discussed systematically.The results show that the composition of surface sediments in the Changjiang Estuary and its adjacent waters is mainly composed of clay silty sand silty sand and sand.In the study area, the particle size composition showed obvious distribution characteristics of "south fine, north coarse, near-shore fine and offshore coarse", and the surface sediment granularity of Yangtze Estuary and Zhejiang coastal muddy area was the finest.The mean particle size (桅) was over 5) the BSi content in the surface sediments was 0.22% and 1.82%, and the silt content in the sediment was 1.82%.The content of clay and mean particle size (桅) were positively correlated with BSi content, and the contents of TOC and TN in clay and fine granular sediments with more clay and silt were in the range of 0.04% 1.17% and 0.01% 0.26%, respectively.The distribution characteristics were also positively correlated with the distribution of median particle size (桅) and BSi in sediments, indicating that fine granular sediments are more favorable for the preservation of organic matter, and diatoms in surface sediments may be one of the sources of organic matter.
【作者單位】： 中國科學(xué)院海洋研究所海洋生態(tài)與環(huán)境科學(xué)重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);青島海洋科學(xué)與技術(shù)國家實(shí)驗(yàn)室海洋生態(tài)與環(huán)境科學(xué)功能實(shí)驗(yàn)室;青島市環(huán)境監(jiān)測中心站;
【基金】：長江口及其鄰近海域沉積硅藻記錄與定量富營養(yǎng)化歷史重建(41506142) 聯(lián)合基金項(xiàng)目“海洋生態(tài)與環(huán)境科學(xué)”資助項(xiàng)目(U1406403) 國家自然科學(xué)基金資助項(xiàng)目(41276115)~~
【分類號】：P736.21;TV148.1

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本文編號：1714712