北黄海表层沉积物中颗粒态磷的形态分布  

Forms and Distributions of Particulate Phosphorus in the Surface Sediments of North Yellow Sea

作　　者：孟佳[1] 姚庆祯[1] 陈洪涛[1] 于志刚[1] 

机构地区：[1]中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《环境科学》2012年第10期3361-3367,共7页Environmental Science

基　　金：国家自然科学基金项目(40976044);山东省自然科学基金项目(ZR2010DM003)

摘　　要：于2007年10月乘东方红2号科考船在北黄海采集表层沉积物,应用改进的SEDEX法对表层沉积物中的可交换态磷、有机磷、铁结合态磷、自生磷灰石磷、碎屑磷和难分解有机磷等6种颗粒态磷的含量进行了测定,并分析了其分布状况及其影响因素.结果表明,碎屑磷和自生磷灰石磷是总颗粒态磷的主要组分,含量的变化范围分别为25.7～122.5μg.g-1和5.7～176.2μg.g-1,分别占总颗粒态磷的质量分数为17.0%～56.9%和10.2%～49.8%.弱吸附态磷、可提取态有机磷、铁结合态磷、难分解有机磷含量的变化范围分别为5.5～43.9、4.1～41.4、2.3～26.7、6.0～33.6μg.g-1.碎屑磷和自生磷灰石磷含量之和占据了总颗粒态磷的大部分,表明总磷以自然来源磷为主;铁结合态磷含量较低,表明北黄海受人为输入引起的污染程度较轻;可提取态有机磷与难分解有机磷之和占总颗粒态磷的质量分数很低,表明颗粒态磷中有机态含量较低,主要以无机态的形式为主;生物可利用磷即弱吸附态磷、可提取态有机磷、铁结合态磷之和,占总颗粒态磷的质量分数为6.7%～33.2%,表明调查区表层沉积物中磷的生物可利用性较低.Surface sediments were collected from the North Yellow Sea in October 2007.The sediments were analyzed with modified SEDEX to obtain six forms of phosphorus.The results indicate that among the total phosphorus the detrital phosphorus and authigenic phosphorus are the main forms and the content varies from 25.7 to 122.5 μg·g-1 and from 5.7 to 176.2 μg·g-1,respectively,which taking up 17.0%-56.9% and 10.2%-49.8% of the total phosphorus.The content of exchangeable phosphorus,extractable organic phosphorus,iron-bound phosphorus and refractory phosphorus ranges from 5.5 to 43.9,from 4.1 to 41.4,from 2.3 to 26.7,from 6.0 to 33.6 μg·g-1,respectively.Detrital and authigenic phosphorus are the major forms of the total phosphorus,indicating that the natural input is the major source of particle phosphorus in the study area.The content of iron-bound phosphorus is low,indicating that human input is minor in the area;mass fraction of the extractable organic phosphorus and refractory organic phosphorus is low,indicating that there is a low organic content while the main form of the total phosphorus is inorganic in the surface sediments of this area.Bioavailable phosphorus as exchangeable phosphorus,extractable organic phosphorus and iron-bound phosphorus account for 6.7%-33.2% of the total particle phosphorus,indicating that bioavailability of phosphorus in the surface sediments is low.

关 键 词：北黄海 颗粒态磷 沉积物 形态 分布 

分 类 号：X145[环境科学与工程—环境科学]