南极普里兹湾沉积物中有机碳和总氮的含量与分布

刘瑞娟; 于培松; 扈传昱; 韩正兵; 潘建明

doi:10.3969/j.issn.0253-4193.2014.04.003

南极普里兹湾沉积物中有机碳和总氮的含量与分布

doi: 10.3969/j.issn.0253-4193.2014.04.003

Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

基金项目: 国家自然基金项目（41006118，41076134）；南北极环境综合考察与评估专项（CHINARE2012-04-04）。

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出版历程
- 收稿日期: 2013-02-23
- 修回日期: 2013-06-25

Contents and distributions of organic carbon and total nitrogen in sediments of Prydz Bay, Antarctic

Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 利用中国多次南极科学考察获得的沉积物样品，对普里兹湾沉积物中有机碳（OC）、总氮（TN）的含量和分布以及OC/TN进行了分析。结果表明:普里兹湾表层沉积物中OC和TN的含量变化范围分别为0.14%~1.20%和0.02%~0.20%，平均值分别为0.63%和0.11%。OC/TN的变化范围为5.5~8.2，平均值为6.8。OC和TN含量呈现明显的正相关性，表明有机质来源相同，比值接近6.6，说明有机质主要为海洋生源沉积。两者平面分布趋势非常一致，且与沉积物中泥质含量呈显著正相关，湾内73°E以西区域OC和TN含量较低，而以东区域含量较高，这是上层水体生产过程和冰川携带陆源砂等因素共同作用的结果。垂直分布上，OC和TN含量总体上表层高于深层，OC含量随深度增加逐渐降低，达到一定深度后趋于稳定。较高的沉积速率加速OC的埋藏，5根柱样中OC的埋藏率为39%~91%，平均为66%，表明普里兹湾是重要的碳汇区。
- 碳氮比 /
- 碳埋藏 /
- 碳循环 /
- 生物地球化学
Abstract: The organic carbon (OC), total nitrogen (TN) and OC/TN were analyzed in sediments from Prydz Bay (Antarctic) during the CHINARE-18/21/24/25/27 cruises. The results show that the contents of OC and TN were 0.14% to 1.20% and 0.02% to 0.20%, respectively, with averages of 0.63% and 0.11%. OC/TN ranges from 5.5 to 8.2 and 6.8 on average. The obvious positive correlation between OC and TN indicates that organic matters come from same source. OC/TN, approaching to 6.6, reveals the organism is mainly from marine biogenic matter. OC and TN show same distribution tendency and positive correlation with content of mud in sediments, and which both lower in the west of 73°E, but higher in the east, even with the highest value in the southeast of Prydz Bay. This pattern was controlled by primary production in upper water and terrigenous sand carried by glacier. The contents of OC and TN in surface sediments are higher than those in deep layers, and the former decreases with depth of core to a constant value. Higher sedimentation rates can accelerate carbon burial rate. The burial efficiency of OC ranges from 39% to 91%, averagely 66%, indicating Prydz Bay is an important carbon sink area.
- OC/TN /
- carbon burial /
- carbon cycle /
- biogeochemistry

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