水源涵养林是具有特殊意义的防护林种，具有很好的涵养水源、保持水土、净化水质等功能。

Water conservation forest is a special kind of protection forests. It can protect water resources, control soil erosion, purify water quality and so on.

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为森林净化水质的功能，提供了依据。

The mechanism and benefits of forest purifying water were discussed in the paper.

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水生植物是构成水景的重要要素之一，具有美化水体和净化水质等功能。

Aquatic plant is an important element of the waterscape, and it plays important roles in the landscaping and water purification.

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