本文選題：渤海　切入點(diǎn)：沉積有機(jī)碳　出處：《海洋學(xué)報(bào)》2016年06期 　論文類(lèi)型：期刊論文

【摘要】：大河影響下的陸架邊緣海沉積有機(jī)碳的分布和來(lái)源是全球碳循環(huán)研究的重要內(nèi)容。本研究于2012年5月采集了渤海海域的29個(gè)表層沉積物樣品,分析了粒度組成、總有機(jī)碳(TOC)、總氮(TN)、木質(zhì)素含量和穩(wěn)定碳同位素豐度(δ13C)等參數(shù),結(jié)合基于蒙特卡洛模擬的三端元混合模型,定量研究了沉積物中有機(jī)碳的分布和來(lái)源情況,并討論了其影響因素。結(jié)果表明,研究區(qū)域表層沉積物中TOC含量為0.19%~0.81%,渤海中部泥質(zhì)區(qū)站位(大于0.65%)明顯高于其周?chē)百|(zhì)區(qū)域站位(小于0.40%);TOC與黏土含量也有顯著的正相關(guān)性,說(shuō)明細(xì)顆粒沉積物容易富集有機(jī)碳。沉積有機(jī)碳的δ13C范圍為-23.7‰~-21.8‰,顯示沉積有機(jī)碳是海源和陸源有機(jī)碳的混合輸入。木質(zhì)素參數(shù),如C/V、S/V和LPVI的數(shù)值范圍顯示研究區(qū)域表層沉積物中木質(zhì)素主要來(lái)源于被子植物草本組織與木本組織的混合,同時(shí)有少量裸子植物的貢獻(xiàn)。基于蒙特卡洛模擬的三端元混合模型顯示研究區(qū)域沉積物中有機(jī)碳主要來(lái)源于海洋浮游植物,平均為64%,陸源有機(jī)碳中來(lái)自土壤的貢獻(xiàn)最高(平均為27%),C3維管植物的貢獻(xiàn)較少(平均為9%)。海洋浮游植物有機(jī)碳主要分布在渤海中部泥質(zhì)區(qū)及離岸較遠(yuǎn)的區(qū)域,而土壤有機(jī)碳和C3維管植物有機(jī)碳則主要沉積在河口附近及近岸區(qū),并可以離岸輸運(yùn)到較遠(yuǎn)的地方。
[Abstract]:The distribution and source of organic carbon in marginal sea sediments under the influence of great rivers is an important part of the global carbon cycle study. In May 2012, 29 surface sediment samples from Bohai Sea were collected and the grain size composition was analyzed. Total organic carbon (TOC), total nitrogen (TNN), lignin content and stable carbon isotope abundance (未 13C) were used to quantitatively study the distribution and source of organic carbon in sediments, combined with a three-terminal element mixing model based on Monte Carlo simulation. The results show that the content of TOC in the surface sediments of the study area is 0.19 / 0.81, and the station position (> 0.65) in the muddy area of the central Bohai Sea is significantly higher than that in the sandy area around it (< 0.40%), and there is also a significant positive correlation between the TOC content and the clay content. The 未 ~ (13) C range of sedimentary organic carbon is -23.7 鈥，

本文編號(hào)：1588329