在地球表层由彼此密切联系的各自然地理成分有规律地组合而成的统一整体。包括自然区划和土地类型的各级单位。
湿地是喜水生物及过湿环境构成的特殊自然综合体。
Wetlands are a special natural integration composed of hydrophilous biology and wet environment.
湿地是由陆地系统和水体系统相互作用形成的自然综合体。
Wetlands are formed by the interaction between terrestrial system and aquatic system.
是地球表层上由水、土和适生植被相互作用构成，其内部过程为水所控制的自然综合体。
And is described as a physical synthesis which composed of water, soil and vegetation and the process is dominated by that of water in the surface layer of the earth.
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