Utility of the two-source energy balance (TSEB) model in vine and interrow flux partitioning over the growing season

For monitoring water use in vineyards, it becomes important to evaluate the evapotranspiration (ET) contributions from the two distinct management zones: the vines and the interrow. Often the interrow is not completely bare soil but contains a cover crop that is senescent during the main growing sea...

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Bibliographic Details
Published in:Irrigation science 2019-05, Vol.37 (3), p.375-388
Main Authors: Kustas, W. P., Alfieri, J. G., Nieto, H., Wilson, T. G., Gao, F., Anderson, M. C.
Format: Article
Language:English
Subjects:
Agricultural practices
Agriculture
Aquatic Pollution
Biomedical and Life Sciences
Climate Change
Covariance
Cover crops
Crops
Daytime
Drip irrigation
Dry season
Energy balance
Environment
Evapotranspiration
Fluctuations
Fluxes
Growing season
Irrigation systems
Land surface temperature
Life Sciences
Original Paper
Partitioning
Remote sensing
Seasons
Soil
Stubble
Surface temperature
Sustainable Development
Towers
Transpiration
Vines
Vineyards
Waste Water Technology
Water Industry/Water Technologies
Water Management
Water monitoring
Water Pollution Control
Water use
Wineries & vineyards
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Summary:For monitoring water use in vineyards, it becomes important to evaluate the evapotranspiration (ET) contributions from the two distinct management zones: the vines and the interrow. Often the interrow is not completely bare soil but contains a cover crop that is senescent during the main growing season (nominally May–August), which in Central California is also the dry season. Drip irrigation systems running during the growing season supply water to the vine plant and re-wet some of the surrounding bare soil. However, most of the interrow cover crop is dry stubble by the end of May. This paper analyzes the utility of the thermal-based two-source energy balance (TSEB) model for estimating daytime ET using tower-based land surface temperature (LST) estimates over two Pinot Noir ( Vitis vinifera ) vineyards at different levels of maturity in the Central Valley of California near Lodi, CA. The data were collected as part of the Grape Remote sensing Atmospheric Profile and Evapotranspiration eXperiment (GRAPEX). Local eddy covariance (EC) flux tower measurements are used to evaluate the performance of the TSEB model output of the fluxes and the capability of partitioning the vine and cover crop transpiration ( T ) from the total ET or T /ET ratio. The results for the 2014–2016 growing seasons indicate that TSEB output of the energy balance components and ET, particularly, over the daytime period yield relative differences with flux tower measurements of less than 15%. However, the TSEB model in comparison with the correlation-based flux partitioning method overestimates T /ET during the winter and spring through bud break, but then underestimates during the growing season. A major factor that appears to affect this temporal behavior in T /ET is the daily LAI used as input to TSEB derived from a remote sensing product. An additional source of uncertainty is the use of local tower-based LST measurements, which are not representative of the flux tower measurement source area footprint.
ISSN:0342-7188
1432-1319
DOI:10.1007/s00271-018-0586-8