DISTRIBUTION AND POLLUTION OF NITROGEN AND PHOSPHORUS IN SURFACE SEDIMENTS FROM THE PEARL RIVER ESTUARY
DISTRIBUTION AND POLLUTION OF NITROGEN AND PHOSPHORUS IN SURFACE SEDIMENTS FROM THE PEARL RIVER ESTUARY
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发表时间：
2007
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通讯作者：
Yue Wei
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作者：
Yue Wei
珠江口是一个典型的环境生态因子敏感性河口，富营养化和赤潮频繁发生。为了解河口表层沉积物中氮、磷的空间分布及营养盐向海水的循环机制，采集了16个河口表层沉积物样品，测定了氮、磷及其他金属元素的含量和形态。采用单一标准指数法对沉积物中氮、磷污染进行评价。结果表明，表层沉积物中总氮含量较高，平均为1649mg/kg，其中有机氮含量占83.17%，平均为1374mg/kg;无机氮以NH_4-N为主，平均含量为209.64mg/kg，其次为NO_3-N和NO_2-N，平均含量为54.87mg/kg。表层沉积物中总磷平均含量为455.94mg/kg，其中有机磷含量为179.69mg/kg，占39.41%。铁磷、铝磷平均含量为94.97mg/kg。不同站位不同形态氮磷含量主要受陆源输入、沉积物粒度和水动力的影响。总磷单项标准指数均小于1，说明总磷含量较低。但总氮含量较高，标准指数在1.96~3.86之间，表明氮污染较为严重。
The Pearl River Estuary is a typical estuary with susceptibility in environmental ecological factors,suffering frequently from eutrophication and red tide. To understand the spatial distribution of nitrogen and phosphorus,and the mechanism of nutriment cycle from sediment to seawater,16 samples were collected from the estuary surface sediments,for determining the concentration and forms of the nutrients and other metals. Single standard index method was used to assess the pollution of nitrogen and phosphorus in sediment. The results indicate that the content of total nitrogen was relatively higher in the surface sediment in average of 1649mg/kg,in which 83.17% was organic nitrogen that averaged at 1374mg/kg. NH4-N was the main form of inorganic nitrogen in average of 209.64mg/kg,with minor NO3-N and NO2-N together at 54.87mg/kg. The mean content of total phosphorus was 455.94mg/kg in surface sediment,in which organic one took 39.41% at 179.69mg/kg. The mean content of Fe-P and Al-P was 94.97mg/kg. The contents of different forms of nitrogen and phosphorus in different sites were mainly influenced by terrigenous inputs,sediment grain size and hydro-dynamics. All the single standard indexes of total phosphorus were below 1,indicating that the content of the total phosphorus was relatively low. However,the content of total nitrogen was high,the standard indexes ranged from 1.96 to 3.86,which indicated that the nitrogen pollution was relatively serious.