Forests are interdependent with water and blood. As the main body of the terrestrial ecosystem and the most comprehensive resource pool in nature, forests have various functions such as regulating the climate, conserving water sources, maintaining water and soil, protecting against wind and sand, improving soil, and reducing pollution. It plays a decisive and irreplaceable role. Forests can conserve water. According to expert research, forests have a redistribution effect on rainfall, and 25% of rainfall can be stored and absorbed by vegetation. It is generally believed that 50,000 mu of forest trees is equivalent to A 1 million cubic meter reservoir. This passage mainly talks about:. ['The importance of protecting forests.', 'The importance of protecting water sources.', 'Ecological environment for human existence.', 'Dependence of water and forest.']