Nitrate content in ground water accumulates obviously with the increase of N-fertilizer applied, so the potentialpollution should not be ignored.
随着施N时间的推移和施用量的增加，地下水中硝态氮具有明显的积累趋势，潜在污染不容忽视；
2
However, the potential risk of heavy metal pollution in the water should not be overlooked considering the high concentrations of heavy metals in the river sediments in and around towns.