Wetland is the `kidney of the earth`, and wetlands can effectively remove the pollutants such as nitrogen, phosphorus and heavy metals in water. Wetland is a powerful hydrological regulation and circulation function of `source of fresh water`, which can effectively store, detained precipitation and surface runoff and supplement groundwater. It also has strong function of degrading pollution and purifying water quality. Wetland is a `species gene pool` with abundant terrestrial and aquatic animal and plant resources, forming a natural gene pool and unique biological environment that any other single ecosystem can not compare. Special soil and climate provide complex and complete flora and fauna. It is difficult to protect species and maintain biodiversity. The alternative ecological value.

圖片編號： 118069977
拍攝者： Mengtianhan