The theme addresses the role of forests and trees outside forests to help moderate soil, hydrological and aquatic systems.

本主题处理森林及森林外树木帮助调节土壤、水文以及水生系统的作用。

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Pneumatophore ( aerophore ; breathing root ) a specialized neg atively geotropic root produced by certain aquatic vascular plants ( especially trees such as man groves, e. g.

呼吸根：指由某种水生维管植物产生的特化的负向地性根（尤其如红树，如海桑属） ，在土壤之上生长良好。

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Pneumatophore aerophore; breathing root a specialized negatively geotropic root produced by certain aquatic vascular plants especially trees such as mangroves, e. g.

呼吸根：指由某种水生维管植物产生的特化的负向地性根(尤其如红树，如海桑属)，在土壤之上生长良好。

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