下图是研究人员为净化水质在湖边建立的人工湿地,相关叙述正确的

下图是研究人员为净化水质在湖边建立的人工湿地,相关叙述正确的是(  )

A.图中种植的各种植物体现了湿地群落的垂直结构

B.人类的活动改变了湿地的群落演替方向和速度

C.人工湿地能调节气候属于直接价值

D.各种植物分布区域不同不存在竞争关系

答案

B

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