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Research Articles

Identification of drought prone agro-ecological regions in Sri Lanka

Authors:

RD Chithranayana ,

Natural Resource Management Centre, Department of Agriculture, No.5 Sarasavi Mawatha, Peradeniya, LK
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BVR Punyawardena

Natural Resource Management Centre, Department of Agriculture, No.5 Sarasavi Mawatha, Peradeniya, LK
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Abstract

Drought occurrences are inevitable in almost all regions of Sri Lanka. This study has attempted to identify the agro-ecological regions (AERs) which are vulnerable to drought conditions during Maha and Yala seasons, using a drought index based on the monthly Moisture Availability Index (MAI).

The Wet Zone does not exhibit droughts during Maha seasons except WL2b and WL3 regions which have a slight vulnerability for droughts. All AERs in the Up country and Mid country Intermediate Zone are generally free from droughts. All AERs of the Low country Intermediate Zone are vulnerable to drought during Maha seasons except IL2 and IL1c. In Yala seasons, frequency of drought occurrence in the Wet Zone is low. The drought proneness of the Intermediate Zone is relatively higher compared to the wetter part of the island. All AERs in the Low country Intermediate Zone are vulnerable to droughts except the IL1a region. Excluding the AERs that adjoin the high rainfall receiving AERs of the Wet Zone, all other AERs of the Mid country Intermediate Zone are also prone to droughts. Almost all AERs of the up country Intermediate zone are less likely to experience droughts. All AERs of the Dry Zone are highly vulnerable to droughts. In contrast to Yala seasons, almost all AERs of the Dry Zone are less likely to experience droughts during Maha seasons except those located in the extreme northwestern and southeastern regions.

Keywords: Agro-ecological regions, drought, rainfall, Sri Lanka

doi:10.4038/jnsfsr.v36i2.143

Journal of the National Science Foundation of Sri Lanka 36 (2) 117-123

How to Cite: Chithranayana, R. and Punyawardena, B., 2008. Identification of drought prone agro-ecological regions in Sri Lanka. Journal of the National Science Foundation of Sri Lanka, 36(2), pp.117–123. DOI: http://doi.org/10.4038/jnsfsr.v36i2.143
Published on 25 Jun 2008.
Peer Reviewed

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