Adequacy of simple agricultural drought indices

Halwatura, Devanmini, Mcintyre, Neil, Lechner, Alex and Arnold, Sven (2015). Adequacy of simple agricultural drought indices. In: Paper Proceedings of Agriculture, Aquaculture and Animal Science 2015. International Conference on Agriculture, Aquaculture and Animal Science, Colombo, Sri Lanka, (30-36). 28-29 December 2015.

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Name Description MIMEType Size Downloads
Author Halwatura, Devanmini
Mcintyre, Neil
Lechner, Alex
Arnold, Sven
Title of paper Adequacy of simple agricultural drought indices
Conference name International Conference on Agriculture, Aquaculture and Animal Science
Conference location Colombo, Sri Lanka
Conference dates 28-29 December 2015
Convener Prabhath Patabendi
Proceedings title Paper Proceedings of Agriculture, Aquaculture and Animal Science 2015
Place of Publication Colombo, Sri Lanka
Publisher International Center for Research & Development
Publication Year 2015
Sub-type Fully published paper
Open Access Status Not Open Access
ISBN 9789554543324
Start page 30
End page 36
Total pages 7
Collection year 2016
Language eng
Formatted Abstract/Summary
Drought is one of the most complex recurring climatic events and regularly causes significant agricultural losses. Generally droughts are estimated using drought indices based on rainfall and evaporation. However, agricultural droughts are also a property of soil moisture, crop species or genotype, and growth stage. Thus it is debatable whether meteorological drought  ndices can estimate agricultural droughts. Therefore, in our study we compared agricultural droughts identified with a physically based soil water model that estimates soil water potential to the Reconnaissance Drought Index (RDI), a widely used meteorological drought index.

We calculated soil water potential and RDI at three locations in Eastern Australia with a range of climates - Cairns (tropical), Burke (arid), and Melbourne (temperate).Rainfall and evaporation for the past 25 years and soil hydraulic parameters were used to estimate the RDI and soil water potential respectively. Daily average soil water potential over 5 cm and 30 cm soil depth were estimated using Hydrus 1D and monthly minimum 5 cm and 30 cm depth-averaged soil water potential was calculated. Finally, 5 cm and 30 cm depth-averaged soil water potential were compared with RDI at three time scales (1, 3 and 12 months). Results revealed that correlations were poor between drought indices and soil water potential which emphasizes the benefits of well-calibrated physically based soil water models for detecting agricultural droughts.
Keyword Agricultural drought
Soil moisture
Drought indices
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Second International Conference on Agriculture, Aquaculture and Animal Science 2015

 
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Created: Tue, 26 Apr 2016, 13:44:25 EST by Elisabeth Hansen on behalf of Sustainable Minerals Institute