In-situ partitioning of evaporation and transpiration components using a portable evapotranspiration dome-A case study in Tall Fescue (Festuca arundinacea)

Alam, Muhammad Shahinur; Rahman, Muhammad Moshiur; Lamb, David W

doi:10.1016/j.agwat.2018.10.042

Author(s)

Alam, Muhammad Shahinur

Rahman, Muhammad Moshiur

Lamb, David W

Publication Date

2019-03

Abstract

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.

Citation

Agricultural Water Management, v.213, p. 352-357

ISSN

1873-2283

0378-3774

Link

https://hdl.handle.net/1959.11/26764

Language

en

Publisher

Elsevier BV

Title

In-situ partitioning of evaporation and transpiration components using a portable evapotranspiration dome-A case study in Tall Fescue (Festuca arundinacea)

Type of document

Journal Article

Entity Type

Publication

Author(s)	Alam, Muhammad Shahinur Rahman, Muhammad Moshiur Lamb, David W
Publication Date	2019-03
Abstract	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 (K<sub>cb </sub> ) and soil evaporation (K<sub>e </sub>) 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 (K<sub>cb</sub>/K<sub>c</sub>) 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 K<sub>cb</sub> and NDVI (R² = 0.88) suggesting the possibility of using the latter, for example through remote sensing technologies, to determine the former.
Citation	Agricultural Water Management, v.213, p. 352-357
ISSN	1873-2283 0378-3774
Link	https://hdl.handle.net/1959.11/26764
Language	en
Publisher	Elsevier BV
Title	In-situ partitioning of evaporation and transpiration components using a portable evapotranspiration dome-A case study in Tall Fescue (Festuca arundinacea)
Type of document	Journal Article
Entity Type	Publication

In-situ partitioning of evaporation and transpiration components using a portable evapotranspiration dome-A case study in Tall Fescue (Festuca arundinacea)

Files: