太湖地区农田水环境中氮和磷时空变异的研究

试验研究了太湖地区农田水环境中N和P的动态变化结果表明:太湖地区农田水环境均受到不同程度的N、P污染,且3~7月间呈加重趋势;目前地表水特别是太湖水中N、P含量已远远超过富营养化的极限值,富营养化程度十分严重;地下水中总P和NO3--N含量变化明显,NH4 -N已劣于V类地下水质量标准,基本不适合饮用;浅层地下水中的NH4 -N含量与土壤黏粒含量呈负相关关系,深层地下水(井水)中NO3--N含量与pH值呈正相关关系。该研究可为太湖地区水环境保护和农业面源污染治理提供参考依据。

Spatio-temporal analysis of nitrogen and phosphorus in farmland water environments of Taihu Lake region

This paper analyzed changes in concentrations of nitrogen and phosphorus in farmland water environments in the Taihu Lake region over typical farming months of March,May and July.Results show high nitrogen and phosphorus pollution in the entire farmland water environment.A worsening trend is observed for the period of March to July.Nitrogen and phosphorus contents in surface water,especially in Taihu Lake,far exceed national eutrophication limits,with an acute pollution degree.Total-phosphorus(TP) and nitrate nitrogen(NO-3-N) contents in well waters show obvious increase.As for ammonium nitrogen(NH 4-N),it simply exceeds national type V standard of groundwater quality,very unfit for drinking.A negative linear correlation exists between NH 4N and clay content in shallow groundwater,and a positive linear correlation between NO-3-N and pH in deep groundwater.The results provide scientific-based decision-making tool for environmental protection and melioration drive of non-point source pollution in Taihu Lake region.