Abstract:Fallen wood is an important ecological component in many terrestrial and aquatic ecosystems, and in forest ecosystems, fallen wood has many crucial ecological functions such as habitat for organisms, a site for nitrogen fixation, energy flow, and nutrient cycling. So, study on fallen wood is an important aspect in traditional forest ecology. While fallen wood in forest ecosystems, especially in riparian forests, turns into stream ecosystems because of natural power or human power, it is turned into in st...