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Evapotranspiration in an arid environment

ScienceDaily (December 15, 2020 )

Titre : Evapotranspiration in an arid environment

Quantifying the moisture input of landscape trees and turfgrass

ScienceDaily (December 15, 2020 )

Evapotranspiration is an important process in the water cycle because it is responsible for 15% of the atmosphere’s water vapor. Without that input of water vapor, clouds could not form, and precipitation would never fall. It is the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants.

Continued population growth in the arid southwestern United States is placing greater demand on available water resources. Much of this growth is in sprawling metropolises where water is used outdoors to support urban landscapes. The overall driving force of evapotranspiration of landscape vegetation in arid environments is mostly contingent on the amount of water made available to plants.

One of the objectives of this study was to quantify the evapotranspiration of 10 landscape trees and two turfgrass species using a soil-water balance approach to determine tree grass water use ratios and what this might mean in terms of water use trade-offs in the landscape.

The trees were grown in a plot with a high-density planting. A complete morphological assessment was made on each tree, and monitoring of plant water status was conducted weekly. A water balance was maintained on each tree by quantifying irrigation input, drainage output and change in soil water storage.

In addition, the researchers quantified transpiration using sap-flow sensors, allowing them to indirectly estimate evaporation.

Story Source  : American Society for Horticultural Science

Annonce (ScienceDaily)

Page publiée le 27 juin 2021