Carbon levels in soil affected by climatic conditions

August 18, 2016, University of Western Australia
Carbon levels in soil affected by climatic conditions
Credit: University of Western Australia

Researchers from The University of Western Australia and the Department of Agriculture and Food Western Australia have discovered that hot and dry climatic conditions can limit the organic carbon build up in soil, which can decrease crop productivity and limit measures to offset greenhouse emissions.

Soil can act as both a sink to store carbon from organic matter, or as a source contributing to greenhouse gas emissions as it releases carbon dioxide into the atmosphere through the breakdown of organic matter.

Building soil organic matter means more carbon is stored than lost in this delicate balance, resulting in an increase in the organic content of soil as well as serving to mitigate potential climate change issues from increased emissions.

Soil organic matter is critical for a number of functions, including providing nutrients to plants, aiding the creation of new soil and increasing the ability of the soil to become more resilient to environmental stresses.

Principal Research Fellow from UWA School of Earth and Environment, Associate Professor Frances Hoyle said the researchers assessed more than 1000 soils across WA to 30 centimetres in depth.

"We found that in conditions where there was less than 450mm of annual rainfall in combination with an average daily temperature of 17.2°C or higher, the ability of the soil to store carbon was significantly decreased," Professor Hoyle said.

"This covered a significant 197,300 square kilometre stretch of land between Geraldton, Moora, Perth and Merredin, which represents 42 per cent of WA's agricultural land."

Professor Hoyle said effects on carbon storage from climatic conditions had future implications for agricultural productivity.

"Farmers will need to consider the implications of changes in long-term climatic conditions to soil quality and adopt management strategies to maximise the return of to and decrease its potential losses," she said.

"The fact that such a large area of the state experiences these suggests there is some risk associated with managing soils specifically for .

"The good news is that many of the practices useful for decreasing the risk of loss from soils also support higher profitability through higher yields."

The study has been published in the journal Scientific Reports.

Explore further: Climate warming accelerating carbon loss from thawing Arctic soils, study finds

More information: Frances C. Hoyle et al. Spatially governed climate factors dominate management in determining the quantity and distribution of soil organic carbon in dryland agricultural systems, Scientific Reports (2016). DOI: 10.1038/srep31468

Related Stories

Digging deeper for soil carbon storage

September 10, 2013

Many surface soils in Western Australia are already storing as much carbon as they can, according to research at The University of Western Australia and in collaboration with the Department of Agriculture and Food WA (DAFWA) ...

Turning to dirt as part of the climate change solution

March 9, 2016

Dirt is easy to take for granted if you're not a farmer or gardener. But increasingly, governments are looking to soil as part of the solution to curbing climate change. Widespread changes to agricultural practices could ...

Recommended for you

Rainfall's natural variation hides climate change signal

February 22, 2018

New research from The Australian National University (ANU) and ARC Centre of Excellence for Climate System Science suggests natural rainfall variation is so great that it could take a human lifetime for significant climate ...

Seasonal patterns in the Amazon explained

February 22, 2018

Environmental scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory have led an international collaboration to improve satellite observations of tropical forests.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.