The damage caused by soil erosion in Japan is serious and not only leads to the destruction of land resources, deterioration of the agricultural production environment, imbalance of ecosystems, frequent floods and droughts, but also affects the development of various industries. I am. It destroys land resources, cannibalizes farmland, threatens people's survival, weakens soil, and exacerbates drought. Second, loss of water and soil flow causes silting of rivers, lakes and reservoirs, reducing the efficiency of power generation, irrigation and flood control of reservoirs, increasing the threat of river flooding and navigating rivers. Reduced ability. In recent years, the Janze River basin has been threatened by floods, which is related to the shrinking of lakes along the river.