极地研究
極地研究
겁지연구
Chinese Journal of Polar Research
2015年
4期
412-420
,共9页
何乐龙%于培松%张海峰%韩正兵%蔡小霞%潘建明%张海生
何樂龍%于培鬆%張海峰%韓正兵%蔡小霞%潘建明%張海生
하악룡%우배송%장해봉%한정병%채소하%반건명%장해생
磷%沉积物%生物地球化学%普里兹湾%南极
燐%沉積物%生物地毬化學%普裏玆灣%南極
린%침적물%생물지구화학%보리자만%남겁
phosphorus%sediment%biogeochemistry%Prydz Bay%Antarctica
针对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416.1×10-6—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至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。
針對多次南極攷察中雪龍號在普裏玆灣海域穫取的錶層沉積物樣品,分析瞭該海域沉積物中各形態燐的含量,併討論瞭其分佈特徵和控製因素。結果錶明,錶層沉積物總燐含量介于416.1×10-6—676.3×10-6之間,平均為543.5×10-6,主要由碎屑燐(平均為209.9×10-6)和自生燐(平均為137.7×10-6)組成。自生燐、有機燐呈現從灣東部至西部逐漸降低的分佈趨勢,這種分佈與有機碳、生物硅等生源要素的分佈以及上層水體生產力的高低相吻閤,指示瞭其海洋生源屬性;碎屑燐在灣西部含量較高,其分佈與沉積物中鋁、砂質的分佈模式一緻,錶明其主要來自堆積在西部淺灘區域冰山攜帶的陸源砂質碎屑。可交換態燐(平均為36.0×10-6)和鐵結閤燐(平均為47.1×10-6)在沉積物中含量較低,分彆受沉積物粒度和鐵含量的控製,僅在灣東部和中心箇彆站位含量較高。生物可利用燐在灣東部和中心區域含量較高,可能與上述區域較高的生源顆粒物沉降速率有關,同時這些顆粒物可能吸附瞭水體中的燐進入沉積物中,導緻對應底層海水燐痠鹽濃度相對降低。
침대다차남겁고찰중설룡호재보리자만해역획취적표층침적물양품,분석료해해역침적물중각형태린적함량,병토론료기분포특정화공제인소。결과표명,표층침적물총린함량개우416.1×10-6—676.3×10-6지간,평균위543.5×10-6,주요유쇄설린(평균위209.9×10-6)화자생린(평균위137.7×10-6)조성。자생린、유궤린정현종만동부지서부축점강저적분포추세,저충분포여유궤탄、생물규등생원요소적분포이급상층수체생산력적고저상문합,지시료기해양생원속성;쇄설린재만서부함량교고,기분포여침적물중려、사질적분포모식일치,표명기주요래자퇴적재서부천탄구역빙산휴대적륙원사질쇄설。가교환태린(평균위36.0×10-6)화철결합린(평균위47.1×10-6)재침적물중함량교저,분별수침적물립도화철함량적공제,부재만동부화중심개별참위함량교고。생물가이용린재만동부화중심구역함량교고,가능여상술구역교고적생원과립물침강속솔유관,동시저사과립물가능흡부료수체중적린진입침적물중,도치대응저층해수린산염농도상대강저。
Speciation of phosphorus ( P) in surface sediments collected during several Chinese National Antarctic Re-search Expedition cruises in Prydz Bay was investigated .The sequential extraction method was used to separate and quantify the following five sedimentary P reservoirs:exchangeable phosphorus ( ExP) , iron phosphorus ( FeP) , au-thigenic 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%, respectively, of total P. Obvious positive relationships between both OP and AuP , and organic carbon and biological silica indicated that they might originate from the same source , that is , marine biogenic matter .DeP was positively correlated with alu-minum and sandy sediments , which suggests that this form of P was derived from land-based sources and carried to the sea ice in ocean currents .The content and distribution of P in sediments were mainly influenced by the sources of P, but the grain size of sediments and other physical factors , such as sea ice and current , were also involved . ExP was related to the grain size of sediments , while FeP was related to iron.In addition, both ExP and FeP were small components of total P , accounting for only 8.9%and 6.5%, respectively.Bioavailable P was concentrated in central and eastern Prydz Bay , with an average content of 37.2%of total P.