这就产生了生物群系的概念——一种植物群和动物群共存的结合体。
This resulted in the "biome," a combination of coexisting flora and fauna.
北京湿地植物群落类型丰富，共包括沼泽型组和浅水植物湿地组2个植被型组、5个植被型，18个群系组和78个群落类型。
The plant community styles in Beijing are luxuriant, including 2 groups of vegetation type, 5 vegetation types, 18 formations and 78 community types.
绝大多数植物为风媒植物，根蘖能力很强。植物群落分为4个群系、9个群丛。
The majority of the plants are of small seeds trasported by wind , and possess strong ability of root shooting.
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