本文關(guān)鍵詞： 有色溶解有機(jī)物 三維熒光光譜 平行因子分析 冗余分析 長(zhǎng)江口　出處：《環(huán)境科學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：利用三維熒光光譜(EEMs)-平行因子(PARAFAC)分析技術(shù)對(duì)長(zhǎng)江口及鄰近海域春季(2015年3月)和夏季(2015年7月)有色溶解有機(jī)物(CDOM)的熒光組成及分布特征進(jìn)行分析.共識(shí)別出2類4個(gè)熒光組分,即類腐殖質(zhì)組分C1(370/495nm)、C2(330/405 nm)、C3(365/440 nm)及類蛋白質(zhì)組分C4(295/345 nm).春夏季各層4個(gè)熒光組分分布模式基本一致,從長(zhǎng)江口到鄰近海域逐漸降低.春季類腐殖質(zhì)組分的高值區(qū)分布在長(zhǎng)江口內(nèi),而類蛋白組分高值區(qū)位于南槽附近區(qū)域,表層的CDOM主要來(lái)源于陸源輸入和人類活動(dòng);中層熒光強(qiáng)度值比表層低,受陸源影響減弱;底層熒光強(qiáng)度值比中層略高,是由沉積物再懸浮造成的.各熒光組分在岱山縣附近海域均有一個(gè)較高值,這與島上的居民活動(dòng)有關(guān).夏季熒光組分高值區(qū)與春季相似,各層熒光組分值接近,說(shuō)明夏季研究區(qū)域水體混合較均勻.春夏季腐殖化指數(shù)(HIX)在長(zhǎng)江口較高,而生物指數(shù)(BIX)在鄰近海域較高.將4個(gè)熒光組分(C1~C4)、吸收系數(shù)(a355)與鹽度(S)、溶解有機(jī)碳(DOC)、總氮(TN)、總磷(TP)、葉綠素a(Chl-a)、溶解氧(DO)做冗余分析.結(jié)果表明,4個(gè)熒光組分(C1~C4)與總氮(TN)、總磷(TP)主要受陸源輸入、人類活動(dòng)的影響,溶解有機(jī)碳(DOC)受陸源與海源的共同影響.本文利用三維熒光光譜-平行因子分析(EEMs-PARAFAC)技術(shù)結(jié)合多元統(tǒng)計(jì)方法解析了CDOM組成,清晰揭示了長(zhǎng)江口及鄰近海域CDOM的來(lái)源及主要影響因子,可為河口海域生源要素海洋生物地球化學(xué)研究提供有益的補(bǔ)充.
[Abstract]:The fluorescence composition and distribution of CDOM in spring (March 2015) and summer (July 2015) in the Yangtze Estuary and its adjacent waters were analyzed by using three dimensional fluorescence spectra with parallel factor analysis (PARAFAC). A total of 2 2 was identified. Class 4 fluorescent components, That is, the humus-like component C _ 1 ~ (70 / 495nm ~ (-1) C _ 2o ~ (330 / 405) nm ~ (-1)) and its protein-like component C _ (4) ~ (29) / (345) nm ~ (m ~ m). The distribution pattern of four fluorescence components in each layer in spring and summer was basically the same, and gradually decreased from the Changjiang Estuary to the adjacent sea area. The high value region of humus components in spring was distributed in the Changjiang estuary. However, the high value region of protein-like components is located near the southern trough, the CDOM in the surface layer is mainly derived from terrestrial input and human activities, the fluorescence intensity in the middle layer is lower than that in the surface layer, and is weakened by the influence of the land source, and the fluorescence intensity in the bottom layer is slightly higher than that in the middle layer. Each fluorescence component has a higher value in the sea area near Daishan County, which is related to the activities of residents on the island. The high value area of the fluorescence component in summer is similar to that in spring, and the fluorescence component values of each layer are close to each other. The results show that the mixing of water bodies in summer is more homogeneous, and the humification index (HIX) is higher in the Yangtze Estuary in spring and summer. The biological index (BIX) was higher in the adjacent waters. The four fluorescent components, C1C4, absorptivity, and salinities, dissolved organic carbon (DOC), dissolved organic carbon (DOC), total nitrogen (TNN), total phosphorus (TP), chlorophyll a Chl-a (Do), dissolved oxygen (DOO) were used for redundancy analysis. The results showed that the four fluorescent fractions C1C4) and the total. Total phosphorus (TP) is mainly received from terrestrial sources. The influence of human activities, dissolved organic carbon (DOC) is affected by both terrestrial and marine sources. In this paper, the composition of CDOM was analyzed by means of three-dimensional fluorescence spectroscopic parallel factor analysis and multivariate statistical method. The source and main influencing factors of CDOM in the Changjiang Estuary and its adjacent waters are clearly revealed, which can provide a useful supplement for the study of marine life geochemistry of the biogenic elements in the estuarine area.
【作者單位】： 中國(guó)海洋大學(xué)海洋化學(xué)理論與工程技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC1402101) 國(guó)家自然科學(xué)基金項(xiàng)目(41376106)
【分類號(hào)】：P734;X55

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本文編號(hào)：1533104