Increasing soil fertility and altering legume-grass balance as adaptation strategies for sustainable livestock production under climate change

Presentation

Ghahramani, Afshin and Moore, Andrew d.. 2012. "Increasing soil fertility and altering legume-grass balance as adaptation strategies for sustainable livestock production under climate change." 16th Australian Agronomy Conference: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy (ASA 2012). Armidale, Australia 14 - 18 Oct 2012 Australia.
Paper/Presentation Title

Increasing soil fertility and altering legume-grass balance as adaptation strategies for sustainable livestock production under climate change

Presentation TypePresentation
AuthorsGhahramani, Afshin (Author) and Moore, Andrew d. (Author)
Journal or Proceedings TitleProceedings of the 16th Australian Agronomy Conference (ASA 2012)
Number of Pages4
Year2012
Place of PublicationAustralia
Web Address (URL) of Paperhttps://www.researchgate.net/publication/265134337_Increasing_soil_fertility_and_altering_legume-grass_balance_as_adaptation_strategies_for_sustainable_livestock_production_under_climate_change
Conference/Event16th Australian Agronomy Conference: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy (ASA 2012)
Event Details
16th Australian Agronomy Conference: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy (ASA 2012)
Parent
Australian Agronomy Conference
Delivery
In person
Event Date
14 to end of 18 Oct 2012
Event Location
Armidale, Australia
Abstract

Climate change is predicted to cause reduction of the annual primary productivity in grasslands across southern Australia. Elevated atmospheric CO2 concentrations are likely to favour legumes over grasses in temperate pastures, but legume residues have weaker structure compared to grass species. As a result, more rapidly degradable ground cover during summer can potentially increase risk of soil erosion. Managing pastures for lower legume content may prevent this issue as an adaptation option but at the cost of reduced
production per animal. We applied the GRAZPLAN modelling tools to simulate potential effects of future projected climates (SRES A2 scenario) on pasture and livestock production of 24 representative livestock farms in southern Australia running five livestock enterprises. We applied historical weather data for 1970 to 1999 (as reference) and projected data from four global circulation models. Pasture and animal production
were simulated for focus years at 2030, 2050 and 2070. At each location, and for each climate, we estimated the sustainable stocking rate with the current pasture composition (legume-grass mixture) and with legumes other than lucerne removed from the pastures. Increased soil fertility was also simulated as an adaptation option. At all examined locations, the legume removal option decreased the profit ($/ha) in comparison with
the no adaptation option. Even applying the legume removal in association with the increased soil fertility could not make significant change from the no-adaptation case. Applying the single adaptation of increased soil fertility could partly recover decline in profitability of the farm systems, however its effectiveness decreased over time.

Keywordsclimate change adaptation, modelling, agricultural system, pasture, legume removal
ANZSRC Field of Research 2020300205. Agricultural production systems simulation
300207. Agricultural systems analysis and modelling
Public Notes

Copyright © 2012 Australian Society of Agronomy. Oral presentation - Abstract only published in Conference Proceedings.

Byline AffiliationsCommonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Institution of OriginUniversity of Southern Queensland
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Impact of climate changes on existing crop-livestock farming systems
Ghahramani, Afshin and Moore, Andrew D.. 2016. "Impact of climate changes on existing crop-livestock farming systems." Agricultural Systems. 146, pp. 142-155. https://doi.org/10.1016/j.agsy.2016.05.011