东海特定海区表层沉积物中磷的形态、分布及其环境意义  

DISTRIBUTION OF DIFFERENT FORMS OF PHOSPHORUS IN SEABEDSEDIMENTS FROM EAST CHINA SEA AND ITS ENVIRONMENTAL SIGNIFICANCE

作　　者：郑丽波[1] 叶瑛[2] 周怀阳[3] 王怀照[2] 

机构地区：[1]华东师范大学地理系,上海200062 [2]浙江大学地球科学系,杭州310027 [3]国家海洋局第二海洋研究所,杭州310012

出　　处：《海洋与湖沼》2003年第3期274-282,共9页Oceanologia Et Limnologia Sinica

基　　金：国家十五 (973 )重点基金项目 (地球圈层相互作用中的深海过程和深海记录--海水与海底的物质能量交换 );G2 0 0 0 0 785 0 3号;中日合作项目;1 997

摘　　要：对国家海洋局第二海洋研究所 1 998年 5月调查过程中采集的长江口外东海特定海区表层沉积物综合运用了EDEX、ASPILA和李悦方法进行了系统的总磷及其磷赋存形态分析。把磷分为 5种赋存形态 :吸附态、铁结合态、钙结合态、碎屑态和有机态。同时 ,结合其他沉积物性质和化学组分以及海水环境特征 ,讨论了磷的地球化学特征及其环境意义。研究表明 ,表层沉积物中总磷 (TP)、有机磷 (OP)和铁结合态磷 (Fe P)的含量主要受控于物质来源 ;吸附态磷 (Ad P)与Fe P和OP同属于沉积物中生物可利用磷范畴 ,其在沉积物中的循环主要与铁氧化物有关 ,钙结合态磷 (Ca P)In recent years, eutrophication becomes a serious environment problem in the Changjiang River estuary and adjacent East China Sea due to large nutrient discharge from the Changjiang River. In this study, total phosphorus and its related forms in the sediment is analyzed by means of SEDEX, ASPILA and XRF methods, to determine the geochemistry characters of phosphorus in this region. There are five types of phosphorus: Absorbed-phosphorus (Ad-P), iron-phosphorus (Fe-P), organic-phosphorus (OP), calcium-phosphorus (Ca-P) and detritus-phosphorus (De-P). They differ from each other in occurrence, origin and geochemical features. The TP (Total phosphorus) content in sediment varies from 416.5-697.4μg/g, and its distribution in geographic space is similar with the variation of OP and Fe-P's distribution. TP, OP and Fe-P contents decrease regularly from the estuary to seaward, corresponding to the pattern of dissolved P. Fe-P includes ferric phosphorus and aluminum phosphorus, known as potential variable component in sedimentary phosphorus. In the seabed sediment, Fe-P can be used to determine the source of phosphorus and to indicate the extent of environment pollution. The variation of OP distribution is relatively complicated, for the sources of OP can stem from matters inherited from both terrestrial source and the marine planktons. Ca-P, including authigenic carbonate, fluorapatite, CaCO 3-associated P and biogenic apatite, represents an oceanic sink for reactive P. In the study area, distribution of Ca-P has no relation with CaO in sediment cores, but exhibits an excellent positive correlation with primary productivity and chlorophyll-a content in seawater. Ca-P is mainly in the form of autoclast created by marine plankton, independent of terrigenous supply. As reactive phosphorus, Ad-P in sediment is one of the important forms of inorganic phosphorus and can easily be released to water and be uptook by photoplankton. In our study, the distribution of Ad-Pin sediment is slightly dependent on iron-oxides and seems

关 键 词：东海 表层沉积物 磷 赋存形态 吸附态 铁结合态 钙结合态 碎屑态 有机态 地球化学 海洋浮游生物 

分 类 号：P736.21[天文地球—海洋地质] P734[天文地球—海洋科学]