154543 - In-situ partitioning of evaporation and transpiration components.pdf (806.59 kB)
In-situ partitioning of evaporation and transpiration components using a portable evapotranspiration dome : A case study in Tall Fescue (Festuca arundinacea)
journal contributionposted on 2023-05-21, 15:18 authored by Muhammad Shahinur AlamMuhammad Shahinur Alam, Lamb, DW, Rahman, MM
Understanding the components of water consumption of a crop or pasture through evapotranspiration is important for improving water management. In this study the FAO dual crop coefficient methodology has been used in conjunction with a portable evapotranspiration chamber in-situ, to quantify the basal crop (Kcb) and soil evaporation (Ke) coefficients of a pasture as a function of leaf area index and a widely used spectro-optical reflectance index, NDVI. To facilitate the measurement of soil evaporation component, small segments of the green biomass of a target pasture canopy, Tall Fescue (Festuca arundinacea var. Dovey) were allowed to rapidly senesce by applying a commercial herbicide while preserving the soil moisture and canopy structure. The ratio between the transpiration and evapotranspiration components (Kcb/Kc) increased from 0.03 to 0.46 for zero to highest available vegetation cover (LAI from 0 to 4.22). A significant linear relationship was observed between Kcb and NDVI (R2 = 0.88) suggesting the possibility of using the latter, for example through remote sensing technologies, to determine the former.
Publication titleAgricultural Water Management: An International Journal
Department/SchoolTasmanian Institute of Agriculture (TIA)
PublisherElsevier Science Bv
Place of publicationPo Box 211, Amsterdam, Netherlands, 1000 Ae
Rights statementCopyright (2018) Elsevier B.V. All rights reserved. This article is distributed under the Creative Commons CC BY-NC-ND 4.04.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/).