Gupta V.V.S.R.A, Marcus Hicks A, Stasia Kroker A, Bill Davoren A and David Roget B
A CSIRO Ecosystem Sciences, B formerly CSIRO, PMB No. 2, Glen Osmond, SA, Australia
Soil biological functions in southern Australian dryland cropping soils are mainly regulated by soil moisture and the amount of biologically Long-term cropping systems experiment at Paringi in New South Wales, Australia available carbon3. Therefore, regular addition of carbon sources is critical to maintain functional capability. Generally, in these soils soil biota experience boom-bust cycles of C availability and are exposed to repeated wet-dry events. The depletion of C-rich microsites can affect the distribution, diversity and metabolic status of microbial communities and can impact on the overall biological resilience2,3. We discuss the impact of 6 years of intensive cropping, no-till and optimum fertilizer input systems on microbial activity, diversity and resilience when compared to the traditional fallow-crop rotations.