How do native plants affect the supply of phosphorus to soils?

Blue Mountains Ashlea Doolette

Many Australian soils are low in phosphorus (P) and so mineral P fertiliser is widely used in Australian agricultural systems to achieve adequate plant growth and production.

Phosphorus fertilisers are a non-renewable resource, therefore there is a need to decrease fertiliser inputs and find alternative methods to improve crop nutrition.

Australia’s native vegetation has already adapted and evolved ways to cope with low soil P without the need for fertiliser. Native vegetation is more efficient at taking up P from the soil, can survive on lower amounts of P, and can store large amounts of P in their root and stems that can be remobilised throughout the plant when P reserves are low. 

Phosphorus exists in several chemical forms in plants. These can be divided into inorganic P and different organic compounds (e.g. RNA, DNA, phospholipids). Yet in native plants we don’t fully know the distribution of these different P compounds or their concentrations.

This research will be of great benefit in understanding why different plant species have different P requirements, how native vegetation cycle/transform/remobilise P and thrive under low soil P condition as well as the impact that senesced native vegetation has on P supply to soils. 

This is just one 'featured' honours project with my main area of research focusing on understanding how phosphorus (P) is stored and transformed in soils and plants. I have a particular interest in the role that factors such as temperature, soil water content and soil type – as well as different ecosystems (e.g. agricultural, alpine, coastal) – all play in influencing P cycling. Most projects will require completing some fieldwork. 

If you have your own ideas for an honours project, please contact me to discuss further.

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Ashlea Doolette researcher photo


Tagged in Honours projects - Agricultural science, Honours projects - Soil science, Honours projects - Ecology and environmental science, Honours projects - Ashlea Doolette