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000904462 1001_ $$00000-0002-0007-4267$$aPolain, Katherine$$b0
000904462 245__ $$aDistribution of subsoil microbial activity and biomass under Australian rotational cotton as influenced by system, crop status and season
000904462 260__ $$aCollingwood, Victoria$$bCSIRO$$c2021
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000904462 520__ $$aSoils provide the substrate for important microbial mechanisms that moderate a variety of processes in both managed and natural terrestrial ecosystems. Australian soils are particularly ‘stressed’ and are considered to be highly weathered and nutrient deficient. This places increased pressure on the Australian cotton industry to sustainably increase productivity to support the fibre demands of a growing global population. We explored Vertosol subsoils (>30 cm) under rotational cotton crops, measuring the distribution of soil microbial activity (SMA) and biomass (SMB) to 100 cm depth, as influenced by crop system and time, using respiration-based experiments. Seasonal SMA fluctuations were considered by capturing the long-term SMA between systems using stable oxygen isotope methodology. Our results indicate that subsoils contributed 47% of SMA, regardless of system, but subsoil SMB (26%) was constrained by resource availability. Long-term SMA was not significantly influenced by depth and system, presumably as a consequence of the shrink–swell nature of Vertosols facilitating organic matter movement down the profile. The impact of this organic matter on the activity of indigenous microorganisms below the top 30 cm of the profile highlights a need to consider deeper soil when unravelling the potential microbial benefits to our cropping systems.
000904462 536__ $$0G:(DE-HGF)POF4-2173$$a2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217)$$cPOF4-217$$fPOF IV$$x0
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000904462 7001_ $$0P:(DE-HGF)0$$aKnox, Oliver$$b1
000904462 7001_ $$00000-0002-7983-0909$$aWilson, Brian$$b2
000904462 7001_ $$0P:(DE-HGF)0$$aGuppy, Christopher$$b3
000904462 7001_ $$0P:(DE-HGF)0$$aLisle, Leanne$$b4
000904462 7001_ $$0P:(DE-HGF)0$$aNachimuthu, Gunasekhar$$b5
000904462 7001_ $$00000-0001-6390-5382$$aOsanai, Yui$$b6
000904462 7001_ $$0P:(DE-Juel1)164361$$aSiebers, Nina$$b7
000904462 773__ $$0PERI:(DE-600)2600572-4$$a10.1071/SR19335$$gVol. 59, no. 6, p. 547 -$$n6$$p547 -$$tSoil research$$v59$$x0004-9573$$y2021
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000904462 9141_ $$y2021
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