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Predicted frequency of wet and dry soil conditions in Tasmanian dairy regions under future climate scenarios

Citation

Christie, K and Rawnsley, R and Cullen, B and Bell, M and Eckard, R, Predicted frequency of wet and dry soil conditions in Tasmanian dairy regions under future climate scenarios, Proceedings of 16th Agronomy Conference 2012, 14-18 October 2012, Armidale NSW, pp. 1-4. (2012) [Refereed Conference Paper]


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Copyright Statement

Copyright 2012 the Regional Institute Ltd & the authors

Official URL: http://www.regional.org.au/au/asa/2012/crop-produc...

Abstract

Durations of wet and dry periods are significant factors that influence pasture management on dairy farms. Historical and future simulated daily climate data for two dairy regions of Tasmania (Flowerdale and Ringarooma) was accessed from the ‘Climate Futures for Tasmania’ project and used to simulate a perennial ryegrass sward growing on a clay loam soil. The simulated soil moisture content to depth of 400mm was used as the criteria for determining number of wet (soil moisture > 160mm) and dry (soil moisture <120mm) days per annum. The mean number of dry and wet days for each region for six general circulation models (GCMs; CSIRO-Mk3.5, ECHAM5, GFDL 2.0, GFDL 2.1, MIROC3.2 and UKHad), was computed for the baseline period (years 1971 to 2000) and three future climate periods (years of 2001 to 2030, 2031 to 2060 and 2061 to 2090). By years 2061 to 2090, the mean number of wet days at Flowerdale and Ringarooma is predicted to decline by 8.5 and 4.5 days per annum, respectively. In contrast, the mean number of dry days for Flowerdale and Ringarooma is predicted to increase by 7.5 and 4.8 days, respectively. While there was little change in the mean number of wet and dry days when averaged over each GCM, there was substantial variation between GCMs for any particular period and region. This paper discusses the implication of these results and also highlights the influence of inter-annual climate variability on dairy farming systems.

Item Details

Item Type:Refereed Conference Paper
Keywords:Climate Futures for Tasmania, climate change, field capacity, readily available water, Flowerdale, Ringarooma
Research Division:Agricultural and Veterinary Sciences
Research Group:Agriculture, Land and Farm Management
Research Field:Agricultural Systems Analysis and Modelling
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Variability (excl. Social Impacts)
Author:Christie, K (Miss Karen Christie)
Author:Rawnsley, R (Dr Richard Rawnsley)
ID Code:77243
Year Published:2012
Deposited By:Agricultural Science
Deposited On:2012-03-21
Last Modified:2014-08-12
Downloads:201 View Download Statistics

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