Rangeland Ecology & Management

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Soil Resource Transfer After Disturbance In Semi-arid Western Australia
Author
Ford, D.J.
Grierson, P.F.
Adams, M.A.
Publisher
The Australian Rangeland Society
Publication Year
2002
Body

Nutrient-rich patches occur around grass tussocks, logs and trees in semi -arid landscapes. Landscape patterns and processes associated with such nutrient patches can influence lateral water movement but it is not known to what extent lateral flow in turn affects soil nutrient transfers. Large -scale disturbances, such as fire, occur frequently in the arid zone of Australia and can alter the landscape by removing obstacles that might otherwise promote accretion of organic matter owing to lateral movement of water. We examined lateral movement of nutrients through the soil in a recently burnt and unburned spinifex (Triodia sp.) community in the semi -arid Pilbara region of northern Western Australia. Nutrient treatments were applied to individual 1m2 sub -plots in burnt and unburned areas in order to examine nutrient movement over time. At 3 and 8 months after application, there was no significant transfer of P outside of the application plots and no significant difference between burnt and unburned sites. However, after 11 months, P transfers to at least 10 cm outside of the plots were discernible. Lateral movement of P was significant only in burnt areas, although trends were similar in both burnt and unburned plots, i.e. CV was greater in unburned plots. Nutrient transfer is an extremely slow process and is likely to be highly

dependent on frequency and intensity of rainfall, as well as soil characteristics.

Language
English
Resource Type
Text
Document Type
Conference Paper
Additional Information

2 - 5 September, 2002

 

Kalgoorlie, Western Australia 

 

ISSN 0-9596923-3-9

 
Conference Name
Australian Rangeland Society 12th Biennial Conference
Keywords
landscape
nutrients
soil
burning
semi-arid
Water Movement
Western Australia