Now our county is carrying out large-scale afforestation, and the widespread planting of fir trees will cause the consequences of water resource depletion. I would like to ask the experts...

Baidu helps you! It will not cause water resource depletion, but will increase the activity of the local microclimate. Planting trees can solidify soil, retain water, and prevent wind and sand. At the same time, it promotes local climate circulation and brings rainwater. Beautify and improve the environment. The questioner may have considered that trees also absorb water, thereby depleting the water source. In fact, this is not the case. What vegetation absorbs is far less than what they indirectly bring. Without trees, the surface evaporation area increases, surface runoff decreases, and the water cycle shrinks. This is the negative effect.