https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32567 Wed 20 Jun 2018 14:18:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35571 Wed 04 Sep 2019 11:04:46 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21795 Sat 24 Mar 2018 07:59:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18801 137Cs at two neighbouring field sites sharing the same land management history but comprising clay soils with different cracking characteristics (cracking black Vertisol and a red Luvisol). A finite element model (FEM) simulation of the vertical transport of SOC and ¹³⁷Cs was developed for each site which accommodates the differing spatial and temporal trends of input and decay of the two species. From these models the diffusion and convection coefficients which best describe the movement of ¹³⁷Cs at each site were determined. Both convection and diffusion coefficients were found to be substantially higher in cracking Vertisol soils (D_Cs = 721 mm2/yr, V_Cs = − 0.84 mm/yr) than in the neighbouring Luvisol soils (D_Cs = 94 mm2/yr, V_Cs = 0 mm/yr). Finally the ¹³⁷Cs transport coefficients determined for each site were used in modelling the SOC profile. The excellent match between predicted and observed SOC profiles suggests that transport of the SOC and ¹³⁷Cs down the soil column at the Luvisol site follows the same pathways. While the match between predicted and observed SOC profiles at the Vertisol site was weaker this was concluded to be more likely due to the impact of extensive soil cracking which is not explicitly accounted for in the SOC FEM rather than the result of the use of ¹³⁷Cs transport coefficients.]]> Sat 24 Mar 2018 07:51:04 AEDT ]]>