本文選題：木質(zhì)素 + 陸源有機(jī)物　； 參考：《中國海洋大學(xué)》2014年碩士論文

【摘要】：廣闊的陸架邊緣海是陸海物質(zhì)互相交匯的活躍地帶，，其發(fā)育的泥質(zhì)區(qū)記錄了豐富的古海洋環(huán)境信息。我國南黃海中部泥質(zhì)區(qū)自全新世以來沉積記錄連續(xù)，尤其是西部邊緣海域以其較低的沉積速率完整記錄了上萬年的古環(huán)境變化信息，為反演陸地古氣候、古植被提供了有力依據(jù)。本文測定了南黃海中部泥質(zhì)區(qū)N02（122o38.843'E，36o1.871'N）柱狀樣沉積物中木質(zhì)素含量及其相關(guān)參數(shù)，探討了該區(qū)域陸源有機(jī)物中木質(zhì)素的母源植被類型、降解方式和程度等信息，結(jié)合參考文獻(xiàn)推斷的柱樣沉積年齡，初步分析了南黃海中部泥質(zhì)區(qū)沉積有機(jī)質(zhì)在上千年尺度上的變化及其對環(huán)境的響應(yīng)。 本文對N02柱樣中木質(zhì)素含量、植被參數(shù)、降解參數(shù)等的研究得到了如下主要結(jié)果和結(jié)論： 1. N02柱樣中Σ8介于0.03~0.3mg/10gds，在-46cm附近達(dá)到整根柱子最大值0.3mg/10gds，繼而減小至-87cm附近的0.06mg/10gds，-87cm以深以0.1mg/10gds為中值線穩(wěn)定波動（且整體較低）。推測2~3ka B.P.以前，黃河入海泥沙量僅為現(xiàn)代黃河的大約1/5；且2.8ka B.P.以前沉積物粒徑較粗導(dǎo)致吸附的陸源有機(jī)質(zhì)較少。這兩點(diǎn)是-87cm以深區(qū)段Σ8小于上部的主要原因。-87cm以深區(qū)段，沉積物的陸源供給并無顯著變化，加之南黃海中部泥質(zhì)區(qū)較為穩(wěn)定的還原沉積環(huán)境可能是該區(qū)間內(nèi)Σ8變化不大的主要原因。 2. N02柱樣中S/V介于0.30~3.4之間，0~-20cm和-210~-230cm區(qū)段S/V大部分小于0.6，C/V則均大于0.05，表明N02柱樣陸源有機(jī)物以被子植物草本組織為主，少量區(qū)間有裸子植物的集中輸入，與現(xiàn)有的全新世中后期黃河流域植被以草本組織為主的研究結(jié)論相吻合。其次，-75~-120cm區(qū)間S/V和C/V的變化趨勢與0~-75cm和-75~-260cm顯著不同。而全新世中后期氣候呈現(xiàn)溫潤-較干冷-干冷三個(gè)階段，這可能是S/V、C/V分階段變化的原因。再者，宋金年間（800a B.P.）蒙古游牧民族南下對黃河流域草原的破壞可能導(dǎo)致0~-20cm區(qū)間被子植物顯著減少，裸子植物集中輸入。此外，近2000年來黃河河道的復(fù)雜性使其裹挾入海的陸源植物碎屑的種類和數(shù)量發(fā)生變化，致使0~-75cm區(qū)間S/V、C/V波動顯著。 3. N02中P/(V+S)與Σ8呈現(xiàn)一級衰減相關(guān)趨勢，表明去甲基/去甲氧基降解是該柱樣中陸源有機(jī)物的主要降解方式。而(Ad/Al)V、P/(V+S)、(Ad/Al)S自上而下穩(wěn)定的波動趨勢表明沉積物中木質(zhì)素的降解主要發(fā)生在河流遷移入海的過程中，而在被埋藏之后則降解不顯著。這兩點(diǎn)結(jié)論與N02所處的還原埋藏環(huán)境相吻合。 4.根據(jù)年代推測，N02柱樣中Σ8在-100cm、-160cm、-180cm、-225cm附近均有較顯著的增加，推測其分別對應(yīng)于東亞冬季風(fēng)的增強(qiáng)期3.2~3.1、4.4~4.2、5.0~4.7和5.9~5.5ka B.P.，尤其是-160cm附近，Σ8呈現(xiàn)多次劇增，這與研究顯示的“4.2ka”事件多次、反復(fù)的東亞冬季風(fēng)增強(qiáng)的特征相吻合。伴隨東亞冬季風(fēng)的增強(qiáng)，強(qiáng)度加大的黃海沿岸流可攜帶更多的陸源有機(jī)物，導(dǎo)致陸源物質(zhì)向外海的輸送增加，這是Σ8響應(yīng)環(huán)境變化的方式之一。其次，柱子由底及頂Pon/P大體逐漸減小，且變化的分節(jié)點(diǎn)與東亞冬季風(fēng)由強(qiáng)至弱的時(shí)間點(diǎn)也較為吻合（6.0~4.2~1.8~0ka B.P.），表明Pon/P在一定程度上也能響應(yīng)東亞冬季風(fēng)的強(qiáng)弱變化。
[Abstract]:The vast continental shelf marginal sea is a sea crossing zone of active material, the development of the mud area recorded the rich ancient marine environment information. Since the Holocene sedimentary record in the Southern Yellow Sea Mud Area in our country continuously, especially the western edge area for its low deposition rate of complete recorded paleoenvironmental change information for thousands of years, for the inversion of Terrestrial Paleoclimate, paleo vegetation provides a strong basis. The Central South Yellow Sea mud area was measured by N02 (122o38.843'E, 36o1.871'N) the content of lignin in columnar sediments and its related parameters, discusses the source of vegetation type lignin domain terrigenous organic matter in this region, the degradation of information the way and extent, column sediment age combined with references, a preliminary analysis of the Central South Yellow Sea Mud Area of sedimentary organic matter in thousands of years on the scale of change and its response to the environment.
In this paper, the main results and conclusions of lignin content, vegetation parameters and degradation parameters in N02 column samples are obtained as follows:
1. N02 column in 8 Sigma is 0.03~0.3mg/10gds, reach the whole column in the vicinity of the -46cm maximum value 0.3mg/10gds, and then decreased to near -87cm 0.06mg/10gds, -87cm to 0.1mg/10gds for the median line to deep stable fluctuation (and lower overall). We speculated that 2~3ka B.P. before the the Yellow River sea sediment amount is only about 1/5 of modern the Yellow River; 2.8ka and B.P. sediments before coarse grain size leads to the adsorption of terrigenous organic matter less. These two points are the main reason for the -87cm.-87cm to less than 8 of the upper part of the deep section Sigma in deep section, there is no significant change in the supply of terrigenous sediments, sedimentary environment and reduction of south central the Yellow Sea mud area relatively stable may be the main reasons of the small 8 sigma changes within the interval.
Between 2. N02 cores in S/V between 0.30~3.4, 0~-20cm and -210~-230cm section of most of the S/V is less than 0.6, C/V greater than 0.05, showed that the N02 cores of terrigenous organic matter in herbaceous angiosperm tissue, a small range of concentration input of gymnosperms, research and conclusion of vegetation in the the Yellow River River Basin in late Holocene in the existing organization based in herbage consistent. Secondly, the -75~-120cm interval S/V and the change of C/V and 0~-75cm and -75~-260cm were significantly different. The Holocene climate in the late show with dry - Cold - warm three stages, which may be S/V, C/V phase change reasons. Furthermore, between song and Jin (800A B.P.) south of the nomadic peoples of Mongolia the Yellow River River Basin grassland destruction may cause 0~-20cm interval of angiosperms was significantly reduced, the gymnosperm concentration input. In addition, the complexity of the the Yellow River river near 2000 the terrigenous plant debris coerced into the sea The variety and quantity of the 0~-75cm fluctuated significantly, resulting in a significant fluctuation in the S/V and C/V range.
3. N02 P/ (V+S) and 8 Sigma is a first attenuation correlation trend, indicating that the methyl / demethoxy degradation is the main degradation of terrigenous organic matter in the column. And (Ad/Al) V, P/ (V+S), (Ad/Al) S top-down stable fluctuation trend shows that the degradation of lignin in the sediment mainly occurred in the process of migration in the river, and was buried in after the degradation is not significant. The two conclusions and N02 the reduction of burial environment coincide.
4. according to the time speculated that the N02 column in 8 Sigma in -100cm, -160cm, -180cm, near -225cm increased significantly, 3.2~3.1,4.4~4.2,5.0~4.7 and 5.9~5.5ka B.P. that enhance its corresponding to the East Asian winter monsoon, especially near -160cm, 8 Sigma has repeatedly increased, this study shows that the "4.2ka" event times enhancement of the East Asian Winter Monsoon characteristics repeatedly coincide. Along with the enhancement of the East Asian winter monsoon intensity increase, the Yellow Sea coast flow can carry terrigenous organic matter more, resulting in the increase of terrigenous materials to sea transport, this is one of the 8 sigma way in response to environmental change. Secondly, the pillars decreased gradually from the bottom and top Pon/P in general. Time points from strong to weak and variable nodes and the East Asian winter monsoon is very consistent with (6.0~4.2~1.8~0ka B.P.), showed that Pon/P can also change the response intensity of winter monsoon in East Asia to a certain extent.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P736.21

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 肖尚斌,李安春;東海內(nèi)陸架泥區(qū)沉積物的環(huán)境敏感粒度組分[J];沉積學(xué)報(bào);2005年01期

2 徐方建;李安春;肖尚斌;萬世明;劉建國;張永超;;末次冰消期以來東海內(nèi)陸架古環(huán)境演化[J];沉積學(xué)報(bào);2009年01期

3 朱志誠;黃土高原森林草原的基本特征[J];地理科學(xué);1994年02期

4 趙一陽,李鳳業(yè),秦朝陽,陳毓蔚;試論南黃海中部泥的物源及成因[J];地球化學(xué);1991年02期

5 楊麗陽;吳瑩;黃俊華;張國森;張經(jīng);;大九湖泥炭柱樣的木質(zhì)素特征[J];地球化學(xué);2009年02期

6 梁美艷;郭正堂;顧兆炎;;中新世風(fēng)塵堆積的地球化學(xué)特征及其與上新世和第四紀(jì)風(fēng)塵堆積的比較[J];第四紀(jì)研究;2006年04期

7 陳建芳;古海洋研究中的地球化學(xué)新指標(biāo)[J];地球科學(xué)進(jìn)展;2002年03期

8 藍(lán)先洪;王紅霞;李日輝;林振宏;張志s

本文編號：1733046