Fire is a common natural phenomenon in forest ecological systems. There is a close relation between forest fire and forest hydrology.

在森林生态系统中，火是一种相当普遍的自然现象，森林火灾和森林水文二者有着密切的关系。

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Fire is an common natural phenomenon in forest ecological systems. There is an close relation between forest fire and forest hydrology.

在森林生态系统中，火是一种相当普遍的自然现象，森林火灾和森林水文二者有着密切的关系。

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The marsh is an important part of the ecological environment which is called one of three ecological systems, (The other two are forest and sea).

湿地是生态环境的重要组成部分，与森林、海洋一起并称为三大生态系统。

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