Fig. 3 Seasonal change of ammonia in river, lake/reservoir and
underground drinking water sources in different regions of China in
2007.
spaces and fractures in rock and sediment beneath the
Earth’s surface, thus the effect of climate is limited. As for
the ammonia level of groundwater in South East, the higher value found between April and June, it may be due to
shallow wells, so the groundwater is related to the surface
water.