It was a quantitative target for describing of self-purification capacity of water environment of area.
它是描述一个地区水环境自净能力大小的定量指标。
Water environment impact is related to the style and strength of the activities and with the water areas self-purification ability.
旅游活动对水环境的影响除了与活动方式、活动强度有关外，与水域面积、自净能力亦有显著的关系。
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