本文關(guān)鍵詞：長江口及鄰近海域沉積物中氮的形態(tài)研究　出處：《中國海洋大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 長江口 沉積物 氮的賦存形態(tài) 生物地球化學(xué)循環(huán)

【摘要】：氮是海洋浮游生物生長和繁殖的必需成分,是海洋初級(jí)生產(chǎn)力和食物鏈的基礎(chǔ)。河流輸入是海洋中氮的主要來源。海洋沉積物中的氮作為水體氮的重要源與匯,是氮的重要儲(chǔ)庫。氮在沉積物中以不同的形態(tài)存在,各形態(tài)氮具有不同的物理化學(xué)性質(zhì)和生物可利用性。對(duì)不同氮形態(tài)含量的測(cè)定及其影響因素的探究是闡明長江口及鄰近海域氮生物地球化學(xué)循環(huán)過程所必需的,對(duì)長江口及鄰近海域生物地球化學(xué)特征的研究提供科學(xué)依據(jù)有重要意義。分別于2013年8月、2014年8月對(duì)長江口及鄰近海域進(jìn)行了調(diào)查,采用改進(jìn)分級(jí)浸提方法對(duì)表層、柱狀沉積物中離子交換態(tài)氮(IEF-N)、碳酸鹽結(jié)合態(tài)氮(CF-N)、鐵錳氧化態(tài)氮(IMOF-N)以及有機(jī)態(tài)和硫化物結(jié)合態(tài)氮(OSF-N)進(jìn)行了測(cè)定,分析了沉積物中氮形態(tài)的分布特征及其影響因素,并對(duì)氮在循環(huán)中的作用、沉積物中氮與浮游植物總量的關(guān)系進(jìn)行了初步探討。2013年8月長江口航次表層沉積物中總氮含量為320-1356 μg/g,平均含量為713.9μg/g。2014年8月長江口航次表層沉積物中總氮平均含量為359-1468μg/g,平均含量為810.4 μg/g。TN含量分布均呈現(xiàn)為調(diào)查海域由北向南逐漸增大、由近岸向外海遞大的趨勢(shì)。這是由于長江口及鄰近海域沉積物中有機(jī)質(zhì)含量明顯增高,海洋沉積物中TN的含量也隨之增高。泥質(zhì)沉積物中TN含量高于砂質(zhì)沉積物中TN含量。研究區(qū)域各形態(tài)氮的分布差異很大,這種分布差異主要是影響各形態(tài)氮含量的影響因素的差異造成的。IEF-N主要受含大量有機(jī)質(zhì)的陸源物質(zhì)、沉積物粒徑、生物活動(dòng)的影響。CF-N分布主要決定于沉積物中有機(jī)質(zhì)礦化作用過程中pH值的變化。IMOF-N與所處的沉積物的氧化還原環(huán)境條件有關(guān)。OSF-N分布主要與初級(jí)生產(chǎn)力有關(guān)。A8-6站位TN垂向變化較大,在表層隨著深度的增加TN含量顯著增加,達(dá)到最高值后隨著深度的增加,TN含量逐漸降低。A7-5站位從表層隨著深度的增加TN含量顯著降低,后隨著深度的增加,TN含量先增加然后逐漸降低。整體表現(xiàn)為隨著深度的增加而降低。研究區(qū)域各形態(tài)氮的分布差異很大,這種分布差異主要是影響各形態(tài)氮含量的影響因素的差異造成的。IEF-N含量因?yàn)殡S著水體深度的增加,水體的混合作用和來自底棲生物的擾動(dòng)作用也變得相對(duì)復(fù)雜。隨著深度的增加CF-N含量波動(dòng)降低,長江口及鄰近海域沉積物顆粒粗,主要為粉砂質(zhì)和細(xì)砂,因此其碳酸鹽含量較高,CF-N含量低。IMOF-N變化比較復(fù)雜,是由于海洋沉積物大部分以粗碎屑,沉積物間的空隙相對(duì)比較大,還原性較強(qiáng)。OSF-N與表層氧氣充足,而且微生物也大部分在沉積物表層,礦化作用充分有關(guān)。
[Abstract]:Nitrogen is an essential component of marine plankton growth and reproduction, is the foundation of marine primary productivity and food chain. The river input is the main source of nitrogen in the ocean. In marine sediment nitrogen as an important source and sink of nitrogen, is an important reservoir of nitrogen. Nitrogen in sediments exist in different forms, each form nitrogen with different physical and chemical properties and biological availability. The determination of different forms of nitrogen contents and influencing factors of the inquiry is to clarify the Yangtze River Estuary and its adjacent waters of nitrogen biogeochemical cycle required, it is important to study on the Yangtze River Estuary and adjacent sea biogeochemical characteristics respectively in August 2013 to provide a scientific basis. In August 2014, conducted a survey on the Yangtze River Estuary and its adjacent areas, the improved hierarchical extraction methods on the surface, nitrogen ion exchange column sediments (IEF-N), carbonate bound nitrogen (C F-N), Fe Mn oxide nitrogen (IMOF-N) and organic and sulfide bound nitrogen (OSF-N) were measured, analyzed the distribution characteristics and influencing factors of nitrogen forms in sediments, and the effects of nitrogen on the nitrogen cycle, the relationship with the phytoplankton in the sediments in the preliminary study of total nitrogen content the voyage of surface sediments in the Changjiang Estuary in August.2013 320-1356 g/g, the average contents of total nitrogen average content of 713.9 g/g.2014 in August in the Changjiang Estuary voyage in surface sediments is 359-1468 g/g, the average content was 810.4 g/g.TN content distribution are presented as the investigation area increased gradually from north to south, from the open sea pass big trend this is due to the content of organic matter in sediments of the Changjiang Estuary and adjacent sea area were significantly increased, TN content in marine sediments also increased accordingly. The content of TN in sediment mud is higher than that of the TN content of sandy sediments. The study area Distribution of domain of different forms of nitrogen, the distribution differences are mainly caused by influence of various forms of nitrogen content differences of.IEF-N containing large amounts of organic matter is mainly affected by the terrigenous matter, sediment grain size, the effect of.CF-N biological activity mainly depends on the distribution of sediment oxidation changes of.IMOF-N organic matter mineralization process pH value the sediment reduction condition on the distribution of.OSF-N and.A8-6 on primary productivity at TN vertical changes in the surface, with increasing content of TN depth increased significantly, reaching the highest value with the increase of depth, the content of TN decreased.A7-5 stations from the surface with increasing content of TN depth decreased significantly after with the increase of depth, the content of TN increased first and then decreased gradually. The overall performance is reduced with increasing depth. The distribution of regional differences in the various forms of nitrogen is very large This distribution, the difference is mainly caused by.IEF-N content influence the concentrations of different nitrogen species differences because with the increase of the depth of water, mixing water and the role of disturbance from benthic organisms has become relatively complex. With the increase of depth CF-N content fluctuation is reduced, the sediment in the Changjiang Estuary and adjacent waters of coarse particles, mainly for silty and fine sand, so the higher carbonate content, low.IMOF-N content change of CF-N is more complicated, because most of the marine sediments of coarse clastic sediments, the gap between the relatively large, relatively strong reduction of oxygen and.OSF-N surface is sufficient, and microbial is also mostly in surface sediments, mineralization fully.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P734

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張運(yùn)林;;氣候變暖對(duì)湖泊熱力及溶解氧分層影響研究進(jìn)展[J];水科學(xué)進(jìn)展;2015年01期

2 宋國棟;劉素美;張國玲;;黃東海表層沉積物中磷的分布特征[J];環(huán)境科學(xué);2014年01期

3 胡利民;石學(xué)法;郭志剛;劉焱光;馬德毅;;南黃海柱狀沉積物中烴類化合物的地球化學(xué)特征及其對(duì)沉積環(huán)境的指示[J];沉積學(xué)報(bào);2013年01期

4 吳金浩;劉桂英;王年斌;徐雪梅;宋倫;;遼東灣北部海域表層沉積物氧化還原電位及其主要影響因素[J];沉積學(xué)報(bào);2012年02期

5 王益鳴;吳燁飛;王鍵;鄭愛榕;;長江口柱狀沉積物中氮的形態(tài)特征研究[J];海洋學(xué)研究;2011年03期

6 王家棟;類彥立;徐奎棟;杜永芬;;黃海冷水團(tuán)及周邊海域夏初小型底棲動(dòng)物現(xiàn)存量及空間分布研究[J];海洋與湖沼;2011年03期

7 李輝;潘學(xué)軍;史麗瓊;米娟;宋迪;趙磊;劉曉海;賀彬;;湖泊內(nèi)源氮磷污染分析方法及特征研究進(jìn)展[J];環(huán)境化學(xué);2011年01期

8 周曉靜;李安春;萬世明;孟慶勇;;東海陸架表層沉積物粘土礦物組成分布特征及來源[J];海洋與湖沼;2010年05期

9 衛(wèi)新鋒;歐陽威;郝芳華;張璇;王云慧;徐一鳴;;河套灌區(qū)溝渠表層沉積物對(duì)磷的吸附[J];農(nóng)業(yè)工程學(xué)報(bào);2010年09期

10 楊育紅;閻百興;;中國東北地區(qū)非點(diǎn)源污染研究進(jìn)展[J];應(yīng)用生態(tài)學(xué)報(bào);2010年03期

，

本文編號(hào)：1393752