The plant associations were also obvious unlike in different cultivated areas.The association was single, where Vallisineria spiralis L. and Hydrilla verticillata (L.

• 在围网养殖区，群丛比较单一，主要是苦草和黑藻群丛，伴生植物简单，而且出现了危害极强的外来种凤眼莲和水花生。