黄东海陆架区沉积物中磷的形态分布及生物可利用性  

The distribution of phosphorus forms and bioavailability in sediments from Huang Dong Hai continental shelf

作　　者：张小勇[1,2] 杨茜[1] 孙耀[1] 黄建生[1] 

机构地区：[1]中国水产科学研究院黄海水产研究所,青岛266071 [2]中国海洋大学海洋污染生态化学实验室,青岛266003

出　　处：《生态学报》2013年第11期3509-3519,共11页Acta Ecologica Sinica

基　　金：国家重点基础研究发展计划项目(2006CB400007);中央级公益性科研院所基本科研业务费专项资金(20603022013003)

摘　　要：采用1992年Ruttenberg连续提取法(SEDEX)将黄东海陆架区沉积物中的磷分为交换态磷(Ex-P),Fe结合态磷(Fe-P),自生磷(Au-P),碎屑磷(De-P),有机磷(Or-P),分析了各形态磷的平面和垂直分布特征;利用沉积物年代序列测定的结果,探讨了柱状沉积物中不同形态磷的含量变化,并进一步分析了该区域磷形态的生物可利用性。结果表明,黄东海陆架区表层沉积物各形态磷平均含量为:Au-P(140.72μg/g)>De-P(59.23μg/g)>Or-P(32.69μg/g)>Fe-P(29.91μg/g)>Ex-P(5.92μg/g);各形态磷在沉积时间序列上分布不同,反映了不同时期人类活动和气候环境等因子对磷埋藏量影响的不同,其中Au-P在长江口H1-18站位含量比南黄海中部3个站位要低得多;调查区表层潜在生物有效磷为13.55%左右,仅仅占沉积磷中的一小部分。Phosphorus is the most important limiting factor in nutrient cycling.It is also the key element controlling primary production in aquatic environments.Sediments act as both a sink and a source of phosphorus because of continuous transport of phosphorus species across the sediment-water interface.Phosphorus is intimately involved in both the terrestrial and marine biogeochemical cycles.However,not all fractions of phosphorus in sediments are released to the overlying water.Therefore the effects of phosphorus in sediments in promoting aquatic environment eutrophication can be more efficiently evaluated by studying phosphorus fractions,rather than total phosphorus（TP）.In this study,the forms and bioavailability of phosphorus in the sediment were analyzed by means of SEDEX（Ruttenberg KC） to determine the geochemical characteristics of phosphorus in the Huang Dong Hai continental shelf.According to this method,there are five types of phosphorus： iron-phosphorus（Fe-P）,organic-phosphorus（Or-P）,detritus-phosphorus（De-P）,exchangeable-phosphorus（Ex-P）,and autologous-phosphorus（Au-P）.They differ from each other in occurrence,origin and geochemical features.The horizontal and vertical distribution of six forms is presented.The profiles of age deposition were also investigated to reveal changes in the contents of the different phosphorus forms over about two hundred years.The rank order of the contents of phosphorus fractions in the surface sediment was Au-P（140.72 μg/g） ＆gt; De-P（59.23 μg/g） ＆gt; Or-P（32.69 μg/g） ＆gt; Fe-P（29.91 μg/g）＆gt; Ex-P（5.92 μg/g）.The contents of Au-P and Or-P decreased from offshore to the open sea,and values for De-P were uniformly distributed over the whole sea area.High contents of TP and Ex-P were present in the Yangtze estuary area.TP,Fe-P,Or-P,De-P,Au-P and Ex-P contents in the sediments were in the range 310.23—941.78μg/g,5.46—58.11μg/g,4.87—80.57μg/g,12.68—282.15μg/g,31.86—271.38μg/g,and 1.32—20.95μg/g,respective

关 键 词：黄东海陆架区 沉积物 磷形态 年代序列 生物可利用性 

分 类 号：Q178.53[生物学—水生生物学]