Skip to main content

As rainfall variability increases, do our graziers have solutions?

By Jeda Palmer and Kate Langford

February 20, 2018

cattle on dry river bed
Mozambique, Tete province, Pacassa village. Image: ILRI

Australia isn’t the only country that could be considered a land of “droughts and flooding rains”, as Dorothea Mackellar so eloquently described in her poem, My Country.

“Sweeping plains” across the world are home to graziers and pastoralists whose livelihoods depend almost entirely on rainfall.

In a good year, abundant grass and other forage enable livestock to thrive. In a bad year, pastoralists may need to sell off or cull their livestock. For herders in many countries, poor seasons mean an ongoing search for new pastures in which they can find feed for their animals.

Research published this week in Nature Climate Change shows that year-to-year variability in rainfall has increased in the world’s grazing lands over the last century.

The scientists looked at historical climate data in the major grazing regions of the world from 1901 to 2014.

An estimated 22 per cent of the planet’s ice-free land is used for livestock grazing.

“Grazing lands are naturally known for their highly variable rainfall; about 25 per cent more year-to-year variability than other lands,” CSIRO chief research scientist Dr Mario Herrero explains.

“This study is showing us that grazing is potentially highly vulnerable to climate change; right across the world, from Australia to Central Asia, sub-Saharan Africa and the Americas.”

Researchers found that 49 per cent of global grazing lands experienced significant increases in year-to-year rainfall variability and 31 per cent experienced significant decreases.

“What is particularly worrying is that the areas especially affected by the increasing variability trends are areas where livestock grazing is important for food access and economies,” says Cecile Godde, PhD candidate with CSIRO.

There are around 600 million rural poor who rely on livestock for their livelihoods.

“If a region such as the Sahel in Africa experiences a lot of variation in rainfall, pastoralists will not be able to maintain their herds and this could exacerbate poverty and malnutrition.”

In Australia, the researchers say, we have a long history of climate variability, which has meant our graziers have found innovative ways to adapt and thrive in the face of adversity.

In recent times, graziers have tended to alter the number of livestock they keep in response to how much feed is available. They also hold off on restocking after droughts to give pastures enough time to recover.

“Strategies such as these will become ever more vital as our climate becomes increasingly variable,” says Dr Herrero.

The research has been a collaboration by scientists from CSIRO, University of Minnesota, University of Arizona and Federal University of Goiás in Brazil, funded by the Gordon and Betty Moore Foundation and the Belmont Forum/FACCE-JPI funded DEVIL project (Delivering Food Security from Limited Land).

Read more about the impact of climate change on agriculture in Environment Reports: Food matters.

3 comments on “As rainfall variability increases, do our graziers have solutions?

  1. Mel Carnegie says:

    I wonder whether a better strategy than selling off stock at low prices when are lean years, then buying it back at higher prices once it rains is actually a sustainable strategy. Who can afford to buy them all in the lean years? And who has money to buy stock back after years of no income?

    Animals migrate to take advantage of times and place of abundance. Perhaps this is more sustainable.

  2. Sandra Hawkins says:

    Regenerative farming goes some way to addressing this by enabling soils to hold more moisture and lessen runoff and erosion.

  3. JOHN LEAKE says:

    And stock control (fencing, water or salt licks) to enable feed build up in favourable times, locations/soils. These can then be held or grazed to suit surrounding areas that are not as controlled. This suits within season variability (storms) and between season variability to some extent.

Leave a Reply

We love hearing from you, but we have a few guidelines. Your email address will not be published. Required fields are marked with *

We love hearing from you, but we have a few guidelines.