Biological approaches to landscape water management

Landscape water generally refers to the surface water used for visual viewing, which is usually divided into two categories: one is natural water features, such as natural rivers, lakes and ponds; The other is artificial water features, such as urban small river, parks and other scenic spots of artificial lakes and real estate development matching fountain, landscape fish pond.

Landscape water treatment water algae clumping, fish disease invasion, unclear water quality, ecological instability, poor landscape and other phenomena, it is landscape water pollution.

There are two main factors of landscape water pollution: one is caused by the invasion of foreign pollutants into landscape water, the other is caused by the characteristics of landscape water itself.

The manifestations of external pollution are as follows: some urban watercourses have been used for a long time as the discharge channels of various industrial wastewater, domestic sewage and agricultural wastewater, which increases the pollution load in water; Surrounding garbage, debris, dust, fallen leaves or other pollutants due to man-made or wind and rain factors into the landscape water, resulting in the increase of suspended solids and bottom sediments, water turbidity; Due to the influence of season, temperature (high temperature in summer) and other factors, the breeding moss and algae invade the water, resulting in green water color and poor water quality.

In addition, landscape water is also faced with internal pollution factors due to its own characteristics, such as real estate development matching fountain, landscape fish pond, generally small water volume, water is too shallow, sunlight can direct to the bottom, easy to promote the algae proliferation in the water; The artificial lake in the park has a large amount of water, but due to its closed nature and poor mobility, oxygen supply is not sufficient and timely, which makes the originally single and fragile ecosystem completely unable to resist external pollution. In addition, for some artificial lakes, fountains, landscape fish ponds, etc. which are not natural, due to the unreasonable shape planning in the initial design, the body volume itself is not conducive to the flow of water, and the self-purification ability of water is inherently insufficient.