极地研究

极地研究 ›› 2015, Vol. 27 ›› Issue (4): 412-420.DOI: 10.13679/j.jdyj.2015.4.412

• 研究论文 • 上一篇    下一篇

南极普里兹湾表层沉积物中磷的形态分布特征

何乐龙 于培松 张海峰 韩正兵 蔡小霞 潘建明 张海生   

  1. 国家海洋局海洋生态系统与生物地球化学重点实验室，国家海洋局第二海洋研究所，浙江 杭州 310012
  • 收稿日期:2015-04-30 修回日期:2015-06-15 出版日期:2015-12-30 发布日期:2015-12-30
  • 通讯作者: 张海生
  • 基金资助:

    国家自然科学基金项目;中央级公益性科研院所基本科研业务费专项资金

SPECIATION OF PHOSPHORUS IN SURFACE SEDIMENTS OF THE PRYDZ BAY, ANTARCTICA

He Lelong, Yu Peisong, Zhang Haifeng, Han Zhengbing, Cai Xiaoxia, Pan Jianming, Zhang Haisheng   

  1. Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, SOA, HangZhou 310012, China
  • Received:2015-04-30 Revised:2015-06-15 Online:2015-12-30 Published:2015-12-30

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摘要： 利用我国多次南极考察中雪龙号在普里兹湾海域获取的表层沉积物样品，分析了该海域沉积物中各形态磷的含量，并讨论了其分布特征和控制因素。结果表明，表层沉积物总磷含量介于416.1~676.3×10-6之间，平均为543.5×10-6，主要由碎屑磷（平均为209.9×10-6）和自生磷（平均为137.7×10-6）组成。自生磷、有机磷呈现从湾东部-西部逐渐降低的分布趋势，这种分布与有机碳、生物硅等生源要素的分布以及上层水体生产力的高低相吻合，指示了其海洋生源属性；碎屑磷在湾西部含量较高，其分布与沉积物中铝、砂质的分布模式一致，表明其主要来自堆积在西部浅滩区域冰山携带的陆源砂质碎屑。可交换态磷（平均为36.0×10-6）和铁结合磷（平均为47.1×10-6）在沉积物中含量较低，分别受沉积物粒度和铁含量的控制，仅在湾东部和中心个别站位含量较高。生物可利用磷在湾东部和中心区域含量较高，可能与上述区域较高的生源颗粒物沉降速率有关，同时这些颗粒物可能吸附了水体中的磷进入沉积物中，导致对应底层海水磷酸盐浓度相对降低。

关键词: 磷, 沉积物, 生物地球化学, 普里兹湾, 南极

Abstract: Speciation of phosphorus in surface sediments which were collected during several CHINARE cruises in Prydz Bay were investigated. The sequential extraction method(SEDEX) was used to separate and quantify the following five sedimentary P reservoirs: exchangeable phosphorus (ExP), iron phosphorus (FeP), authigenic phosphorus (AuP), detritus phosphorus (DeP) and organic phosphorus (OP). DeP and AuP were the major types of phosphorus in surface sediments, with an average of 37.5% and 25.8% to total P. The obvious positive relationships between OP, AuP and OC, Sibio indicated that they might come from the same source which was mainly from marine biogenic matters. DeP could be observed positively correlated with Al and sandy sediments, which preferences land sources that might be carried by sea ice with current. It was shown that the content and distributions of P in sediments were majorly controlled by the sources of P, also included the grain size of sediments and other physical factors such as sea ice and current．ExP was controlled by grain size of sediments, while FeP was controlled by iron. In addition, either ExP or FeP was a small components in total phosphorus, only 8.9% and 6.5% respectively. Bioavailable phosphorus concentrated in the central and eastern region, with an average content of 37.2% to total P.

Key words: phosphorus, sediment, biogeochemistry, Prydz Bay, Antarctica