https://scholars.lib.ntu.edu.tw/handle/123456789/45103
Title: | 懸浮物與沉積物中之脂質 | Authors: | 鄭偉力 | Keywords: | 脂質;懸浮物;沈積物;Lipids;Suspended Matter;Sediment | Issue Date: | 2002 | Publisher: | 臺北市:國立臺灣大學海洋研究所 | Abstract: | 本計畫分析東海陸棚11 個總懸 浮物與9個表層沈積物中之脂肪族烴 類、脂肪醇與固醇的濃度為了探討它 們的區域分布,以及懸浮物與沈積物 之相關。結果顯示:總懸浮物標本中 n-C17, pristane, n-C18, n-C19, n-C19:1, n-C21:6 及squalene 佔極強勢,它們皆 由浮游生物所衍生之碳氫化合物故 簡稱為PDHCs 並且佔絕大部分總碳 氫化合物,含高百分比PDHCs 的測 站位置靠近長江口,另外,含有 n-C21:6最高濃度的三個測站位於文獻 所報告含有最高濃度的葉綠素區 內。脂肪醇中以葉綠素醇與C20:1 與 C22:1 n-alkenols 佔優勢,顯示浮游生 物貢獻。總懸浮物中含固醇量最多者 依次為 24-methylcholesta-5,22E-dien-3b-ol (brassicasterol/ diatomsterol), cholest-5-en-3b-ol (cholesterol), cholesta-5,22E-dien-3b-ol (22-dehydro-cholesterol), 及 27-nor-24-methylcholesta-5,22E-dien- 3b-ol。來自長江陸源脂質在總懸浮物 中並不扮演角色因長江流入東海主 要向南傳輸。比較總懸浮物與沈積物 中之PDHCs 顯示其分解依序為 n-C21:6> n-C19:1, n-C19 及n-C17 > n-C18, pristane 及squalene;脂肪醇分 解依序為C20:1 與C22:1 n-alkenols > phytol。懸浮物的碳優指數變化範圍 是1.04~1.82 平均值為1.41;而沈積 物的碳優指數變化範圍是1.82~3.74 平均值為2.81,此結果可歸因於粒度 效應。 Total suspended matter (TSM) and sediment samples from the East China Sea (ECS) Shelf were analyzed for aliphatic hydrocarbons, alkanols and sterols in order to explore their area distribution and relations between TSM and sediments. TSM samples showed a strong predominance of n-C17, pristane, n-C18, n-C19, n-C19:1, n-C21:6 and squalene; they were planktonically-derived hydrocarbons (PDHCs) and accounted for most of total hydrocarbons. Stations with high percentages of PDHCs were generally situated near the Changjiang. In addition, three stations with highest concentrations of n-C21:6 were located in the hot spot of chlorophyll reported in the literature. Phytol (the most abundant alcohol in TSM) along with C20:1 and C22:1 n-alkenols were dominant in the alcohol fraction, indicating plankton contribution. The sterol composition of TSM was dominated by, in decreasing order, 24-methylcholesta-5,22E-dien-3b-ol (brassicasterol/diatomsterol), cholest-5-en-3b-ol (cholesterol), cholesta-5,22E-dien-3b-ol (22-dehydro-cholesterol), and 27-nor-24-methylcholesta-5,22E-dien- 3b-ol. Terrigenous lipids from the Changjiang did not play a role in TSM since they were transported mainly southward. A comparison of PDHCs in TSM and in sediments showed that degradation is in the following order: n-C21:6> n-C19:1, n-C19, and n-C17 > n-C18, pristane, and squalene. The order for degradation of alcohols was C20:1 and C22:1 n-alkenols > phytol. Carbon preference indices (CPIs) of suspended matter varied from 1.04 to 1.82 with an average of 1.41, and those of sediment ranged between 1.82 and 3.74 with a mean of 2.81. The CPI difference could be attributed to grain size effect. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/14801 | Other Identifiers: | 902611M002007 | Rights: | 國立臺灣大學海洋研究所 |
Appears in Collections: | 海洋研究所 |
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902611M002007.pdf | 246.37 kB | Adobe PDF | View/Open |
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