它主要通过地下茎传播；当根系统碎片或整个植物漂浮到一个区域并生根，或当种子漂浮到一个合适的区域并发芽时，菌落就形成了。
It spreads primarily by underground stems; colonies form when pieces of the root system or whole plants float into an area and take root or when seeds float into a suitable area and germinate.
美国的细菌数量上限是每毫升水不超过500个菌落形成单位。
The U.S. bacterial limit is no more than 500 colony-forming units of bacteria per milliliter of water.
在感染存在下形成的鸟粪石结石含有细菌菌落层。
Struvite stones that form in the presence of infection contain layers of bacterial colonies.
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