Artículo técnico · Innovak News
Evapotranspiration is the process by which plants transfer water from the land surface to the atmosphere, combining two phenomena: evaporation (loss of water vapor from soil and wet surfaces) and transpiration (plants releasing water vapor through stomata - small pores on the underside of leaves). This vapor comes from water absorbed by the roots that travels through the stem to the leaves, where some is used in photosynthesis and the rest is released into the environment.
Evapotranspiration is fundamental in the water cycle: it helps regulate ambient temperature, allows nutrient transport in plants, and is key to efficient irrigation management. The rate of evapotranspiration depends on both temperature and ambient relative humidity. In tropical regions with high humidity, evaporation occurs more slowly - which is why plants there have very large leaves. In desert zones, plants evolved with very small leaves or thorns to conserve water.
Plants are sessile organisms - they cannot change location, so they evolved to maximize use of their surrounding resources while conserving them. If evapotranspiration rate is too high, the plant begins to withdraw water from its own tissues and will dehydrate, while also compromising a valuable resource: soil water. Plants respond by closing stomata to slow transpiration - a rational self-preservation mechanism that, when triggered too frequently, significantly limits productivity.
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