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    李科,金海燕,趙香愛,莊燕培,季仲強,張揚,陳建芳.白令海及西北冰洋有機質來源與新鮮程度的脂肪酸指示[J].海洋學報,2020,42(10):14-27
    白令海及西北冰洋有機質來源與新鮮程度的脂肪酸指示
    Sources and degradation of organic matter in the Bering Sea and the western Arctic Ocean: Implication from fatty acids
    投稿時間:2019-10-24  修訂日期:2019-12-02
    DOI:10.3969/j.issn.0253-4193.2020.10.002
    中文關鍵詞:  白令海  西北冰洋  有機質  脂肪酸  生物泵  北極快速變化
    英文關鍵詞:Bering Sea  western Arctic Ocean  Organic Matter  fatty acid  biological pump  abrupt Arctic climate change
    基金項目:國家自然科學基金(41776205,41406217,41976226);南北極環境綜合考察與評估專項(Chinare 2017-03-04)。
    作者單位E-mail
    李科 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012  
    金海燕 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012
    衛星海洋環境動力學國家重點實驗室,浙江 杭州 310012 
    jinhaiyan@sio.org.cn 
    趙香愛 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012  
    莊燕培 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012  
    季仲強 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012  
    張揚 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012  
    陳建芳 自然資源部第二海洋研究所 自然資源部海洋生態系統動力學重點實驗室,浙江 杭州 310012
    衛星海洋環境動力學國家重點實驗室,浙江 杭州 310012 
     
    摘要點擊次數: 1454
    全文下載次數: 0
    中文摘要:
          白令海、西北冰洋等高生產力海域在北冰洋“生物泵”中起到重要作用;海水升溫、海冰消退等北極快速變化,將強烈影響該海域“生物泵”的結構與規模,并在沉積物中有機質的來源與新鮮程度上有所體現,可用脂肪酸加以指征。對第五次、第六次中國北極科學考察在以上海域采集的表層沉積物進行脂肪酸含量(以沉積物干重計)及組成分析,結果顯示楚科奇海陸架總脂肪酸含量非常高((97.15±55.31) μg/g),白令海盆最低((15.00±1.30) μg/g),加拿大海盆、楚科奇海陸坡、白令海陸架居中(分別為(88.65 ±3.52) μg/g,(70.35±11.32) μg/g與(38.28±14.89) μg/g)。海源脂肪酸占總脂肪酸比例最高(86.82%±7.08%),陸源次之(8.45%±6.62%),細菌最低(4.63%±2.24%);硅藻指數(16:1ω9/16:0)在楚科奇海陸架(> 0.82)、白令海陸架邊緣(> 0.65)較高,其他區域均較低。脂肪酸結果表明:(1) 該海域沉積有機質主要來自海源,陸源貢獻??;在北部、南部楚科奇海陸架、白令海陸架邊緣,硅藻生物量占主要優勢;細菌脂肪酸比例顯著低于溫暖海域,指示低溫抑制細菌活動。(2) 楚科奇海陸架區硅藻生產力高、細菌活動弱,新鮮有機質沉降效率高,但對未來海水升溫、浮游植物群落變化也較為敏感。(3) 加拿大海盆、楚科奇海陸坡的浮游植物群落由綠藻與金藻主導。以上結論說明脂肪酸可指示表層沉積物中有機質的來源與新鮮程度;未來,脂肪酸有望進一步揭示北冰洋“生物泵”對北極快速變化的響應。
    英文摘要:
          The Bering Sea and western Arctic Ocean, as high production areas, play a key role in the Arctic Ocean biological pump, and are vulnerable to abrupt climate change, especially sea water warming and sea ice melt. Alterations in biological pump can influence the sources and degradation of sedimentary organic matter, and thus can be indicated by fatty acid (FA) content and composition of sediment. FA analysis of surface sediments, collected during the 5th and 6th Chinese Arctic Research Expeditions, showed that the total FA of the Chukchi Shelf was exceptionally high ((97.15 ±55.31) μg/g), while the Bering Basin was the lowest ((15.00 ±1.3) μg/g), and the Canada Basin, the Chukchi Shelf and the Bering Shelf were intermediate ((88.65 ±3.52) μg/g,(70.35 ±11.32) μg/g and (38.28 ±14.89) μg/g, respectively). Marine FAs (short chain saturated FA + unsaturated FA) accounted for the most abundant (86.82% ±7.08%), terrestrial FAs (long chain saturated FA) as the second abundant (8.45% ±6.62%), while bacterial FAs (odd FA) as the least (4.63% ±2.24%); diatom index (16:1ω9/16:0) was high at the southern and northern Chukchi Shelf (> 0.82) and the Bering Shelf edge (> 0.65), while it was low at the rest areas. These results indicated that: (1) marine source was the major contributor of sedimentary organic matter of the Bering Sea and the western Arctic Ocean, while terrestrial one contributes minor; diatom predominates was the primary producers of the southern and northern Chukchi Shelf and the Bering Shelf edge; percentage of bacterial FAs was remarkably low, comparing with tropical and temperate seas, suggesting a suppressed bacterial activity under low temperature; (2) labile organic matter accumulation rate was extremely high at the Chukchi Shelf, and was extremely sensitive to sea water warming and sea ice melt; (3) chlorophyceae and prymnesiophyceae dominate phytoplankton community at the Canada Basin and the Chukchi Slope. In conclusion, FA of surface sediment can be used to indicate sources and degradation of organic matter in the Bering Sea and the western Arctic Ocean; further, combining with other samples and biomarkers, FA was viable to shed light on the response of biological pump under the abrupt Arctic climate change.
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