![]() Type of plant: Plants transpire water at different rates. Transpiration rates vary widely depending on weather and other conditions, such as Some of this water is returned to the air by transpiration. Plants put down roots into the soil to draw up water and nutrients into its stems and leaves. Since water vapor also evaporates from the soil, we would have seen even more water vapor captured if we had wrapped the plastic bag around the soil as well. An acre of corn gives off about 3,000-4,000 gallons (11,400-15,100 liters) of water each day, and a large oak tree can transpire 40,000 gallons (151,000 liters) per year. During a growing season, a leaf will transpire many times more water than its own weight. As this picture shows, transpired water will condense on the inside of the bag (this photo shows transpiration after 1 hour). One way to visualize transpiration is to put a plastic bag around some plant leaves. Just because you can't see the water doesn't mean it is not being put into the air, though. Since the water is evaporating from the leaf surfaces, you don't just go out and see the leaves "breathing". ![]() Plant transpiration is pretty much an invisible process. ![]() Visit Media to see details.Īfter a plastic bag is wrapped around part of a plant, the inside of the bag becomes misty with transpired water vapor.Ĭredit: Ming Kei College How much water do plants transpire? ![]() ![]() In order to understand evapotranspiration, let’s explore what transpiration is in more detail. Transpiration occurs when plants take up liquid water from the soil and release water vapor into the air from their leaves. Evapotranspiration also includes transpiration, which is the water movement from the soil to the atmosphere via plants. Evapotranspiration includes water evaporation into the atmosphere from the soil surface, evaporation from the capillary fringe of the groundwater table, and evaporation from water bodies on land. Surface runoff What is evapotranspiration?Įvapotranspiration is the sum of all processes by which water moves from the land surface to the atmosphere via evaporation and transpiration. ![]()
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