Search results
4 paź 2019 · First, water transpires from plants and enters the atmosphere as water vapor. Water from Earth’s oceans, lakes, and rivers also evaporates into the atmosphere. The evaporation from Earth’s waterways and from plants via transpiration is collectively known as evapotranspiration.
Evapotranspiration (E) is the combined processes of physical evaporation and biological transpiration, by which liquid water from open water, soil, and vegetation surfaces is transformed into vapor and transported into the atmosphere.
How does water move through plants to get to the top of tall trees? Here we describe the pathways and mechanisms driving water uptake and transport through plants, and causes of flow...
Transpiration is defined as the physiological loss of water in the form of water vapor, mainly from the stomata in leaves, but also through evaporation from the surfaces of leaves, flowers, and stems.
Light stimulates stomatal opening (see Stomatal Opening and Closure), allowing water vapor to easily leave the leaf. Light also speeds up transpiration by warming the leaf. Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises.
Wind — A breeze will clear water vapor away from the surface of the leaf, leaving the humidity on the leaf surface low and increasing the rate of transpiration. Soil water availability — The water that is transpired must come from somewhere, and that somewhere is the soil.
Carbon dioxide entry: When a plant is transpiring, its stomata are open, allowing gas exchange between the atmosphere and the leaf. Open stomata allow water vapor to leave the leaf but also allow carbon dioxide (CO 2) to enter. Carbon dioxide is needed for photosynthesis to operate.
