富養化

由於水體中氮，浮游生物的大量繁殖，使水體溶解氧含量下降。

造成植物、水生物和魚類衰亡甚至絕跡的污染現象。

When a body of water becomes overly enriched with nitrogen, excessive growth of algae will be resulted.

This leads to oxygen depletion of water, and cause plant, aquatic living things and fishes extinct.