Plants in the forest participate in the oxygen cycle and water cycle of the biosphere through photosynthesis and _ _ _ _ _. They produce oxygen, regulate the climate, and can also block it.

Green plants consume carbon dioxide and release oxygen in photosynthesis, maintaining the relative balance between oxygen and carbon dioxide in the atmosphere; The process by which water is emitted from plants in gaseous form is called transpiration. Most of the water absorbed by plants is used for transpiration, which increases atmospheric humidity and precipitation and participates in the water cycle in the biosphere.

So the answer is: transpiration.