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exogenous pollution
相关语句
  相似匹配句对
     The pollution
     通常克服电磁污染的方法有屏蔽和吸收。
短句来源
     White pollution
     白色污染
短句来源
     Effect of Air Pollution on Function of Weiqi Guarding Against Exogenous Diseases
     大气污染对人体卫外功能的影响
短句来源
     Till now, most of the researches focused on exogenous FA, which is an environmental pollution.
     至今,绝大多数研究都集中在外源性甲醛即环境污染物。
短句来源
     Exogenous H 2O 2 and O .
     外源 H2 O2 和 O.
短句来源
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Wuliangsuhai Lake is one of the representative inland freshwater lakes in grassland area in China.Recently,the lake is shrinking and eutrophication has become serious.This paper interpreted the spatial distribution patterns of total nitrogen(TN),ammonium nitrogen(NH~+_(4)-N),nitrate nitrogen(NO~-_(3)-N) and organic nitrogen(Org-N) in surface water and sediment cores systematically.The results revealed that the average content of TN was 1.78mg/L and the main inorganic nitrogen pollutant was NH~+_(4)-N which accounted...

Wuliangsuhai Lake is one of the representative inland freshwater lakes in grassland area in China.Recently,the lake is shrinking and eutrophication has become serious.This paper interpreted the spatial distribution patterns of total nitrogen(TN),ammonium nitrogen(NH~+_(4)-N),nitrate nitrogen(NO~-_(3)-N) and organic nitrogen(Org-N) in surface water and sediment cores systematically.The results revealed that the average content of TN was 1.78mg/L and the main inorganic nitrogen pollutant was NH~+_(4)-N which accounted for more than 69% of the inorganic nitrogen in surface water;spatial distribution pattern of nitrogen in surface sediment indicated that the nitrogen content in the west of the lake was higher than in the east and the main species of nitrogen was Org-N which was more than 95% of TN.Furthermore based on the Sediment Quality Estimation Guide which was enacted in terms of ecological toxic effects by Department of Environment and Energy of Ontario Province,Canada,1992,the content of TN in surface sediment has certain ecological toxic effects which are more serious;the content of nitrogen decreased with depth and the eutrophication process existed in three periods which revealed that the acceleration of the eutrophication process dated back to the 1990s.The content,speciation distribution and spatial distribution pattern of TN in Wuliangsuhai Lake′s surface water and sediment cores indicated that its pollution was characterized by exogenous and endogenous pollution.The exogenous pollution was mainly the drainage water from farmland and industrial wastewater,which accounted for 50% and 35% of the TN load respectively,pouring into the lake through the main drainage canals,the eighth and the ninth drainage canal.And under certain conditions,the endogenous load could release nitrogen into surface water and make it the main pollution source.Besides the exogenous and the endogenous pollution,the intense evaporation,which accelerated the eutrophication process of Wuliangsuhai Lake,was also a key factor which caused nitrogen accumulation in the surface and modern sediments.

针对草型富营养化湖泊乌梁素海富营养化日趋严重和湿地面积逐渐萎缩的现实,本文系统地研究了TN、NH4+-N、NO3--N和Org-N在上覆水与沉积物中的分布规律。结果表明,上覆水中TN含量平均为1.78mg/L,且无机氮污染以NH4+-N为主,占无机氮总量的69%以上;表层沉积物中氮素的水平分布格局均体现出西高东低的经向分异特征并主要以Org-N的形式存在;表层沉积物中TN对底栖生物已经具有一定的生态毒性效应并正由最低级向严重级过渡;氮素在乌梁素海沉积剖面上均表现出随深度增加而含量递减的规律,表层0~10cm的TN平均含量达到1.28g/kg,分别为10~22cm和22~40cm的1.6和1.9倍,揭示了乌梁素海富营养化进程加速始于20世纪90年代。

 
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