Nitrogen,phosphorous and organic matter spatial distribution characteristics and their pollution status evaluation of sediments nutrients in lakeside zones of Taihu Lake
Nitrogen,phosphorous and organic matter spatial distribution characteristics and their pollution status evaluation of sediments nutrients in lakeside zones of Taihu Lake
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发表时间：
2012
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通讯作者：
Jin Xiangcan
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作者：
Jin Xiangcan
采集太湖滨湖区表层（0~10 cm）样品，测定有机质（OM）、全氮（TN）、总磷（TP）含量，最后对表层沉积物进行污染评价。结果表明，太湖湖滨区表层沉积物OM含量范围为1.42%~9.96%。表层沉积物OM含量空间变化趋势由高到低依次为：太湖、珠山湾、拱湖湾、梅梁湾、南岸、东岸、西岸。表层沉积物TN含量与OM具有相似的空间分布规律，范围为458mg/kg~5211mg/kg。TN空间变化趋势由大到小依次为：东太湖、珠山湾、东岸、拱湖湾、南岸、梅梁湾、西太湖。顶层沉积物TP含量为128.56mg/kg～1392.16mg/kg。TP空间变化趋势由大到小依次为：珠山湾、梅梁湾、东太湖、南岸、拱湖湾、东岸、西岸。OM含量与TN含量呈极显着正相关(r=0.903,P0.01),但与TP无明显相关性。顶层沉积物中有机质含量（r=0.073，P0.332）。从综合污染指数和有机指数来看，整个湖滨区沉积物环境质量仍属于清洁类。除东太湖和竹山湾受N、P污染较严重外，其他地区均为轻度至中度污染。除东岸外，大部分地区有机污染处于较低污染水平。
Top layer(0~10 cm) samples in the lakeside zones of Taihu Lake were collected.The content of organic matter(OM),total nitrogen(TN),and total phosphorus(TP) were measured,and finally pollution assessment for top layer sediments was made.The results showed that the OM levels in top layer sediments in lakeside zones of Taihu Lake ranged from1.42% to 9.96%.The spatial change trend of OM content of the top layer sediment in the decrease order as follows: Eastern Taihu Lake,Zhushan Bay,Gonghu Bay,Meiliang Bay,South shore,East shore,and West shore.TN content of the top layer sediment had a similar spatial distribution regularity with OM,ranged from 458mg/kg to 5211mg/kg.The spatial change trend of TN in the decrease order as follows: Eastern Taihu Lake,Zhushan Bay,East shore,Gonghu Bay,South shore,Meiliang Bay and West shore.TP content of the top layer sediment ranged from 128.56mg/kg to 1392.16 mg/kg.The spatial change trend of TP in the decrease order as follows: Zhushan Bay,Meiliang Bay,Eastern Taihu Lake,South shore,Gonghu Bay,East shore and West shore.OM content and TN content had very significant positive correlation(r=0.903,P0.01),but no obvious correlation with TP content(r=0.073,P0.332) in the top layer sediments.Based on comprehensive pollution index and organic index,the environmental qualities of sediments in the whole lakeside zones still belonged to clean category.Except for Eastern Taihu Lake and Zhushan Bay seriously polluted by N,P and the other areas were mild-to-moderate pollution.The organic pollution of most areas was under lower pollution level except East shore.