https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12348 Wed 11 Apr 2018 16:55:48 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5949 Wed 11 Apr 2018 14:08:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8957 Sat 24 Mar 2018 08:37:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:16934 Sat 24 Mar 2018 08:00:30 AEDT ]]> https://nova.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 ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27735 137Cs and ²¹⁰Pb were assessed with the aim of better understanding the transport processes which produce the observed vertical distribution of SOC. While no consistent relationship was found between SOC and soil physical properties significant relationships were found between the distribution of SOC and the environmental tracers, ¹³⁷Cs and ²¹⁰Pb. Finite element simulations based on a diffusion/convection/decay model showed that the transport of ¹³⁷Cs and ²¹⁰Pb down the soil profile is likely to be driven by the same (primarily diffusive) processes. The same model used in conjunction with plant input and decay data generated from the RothC-26.3 soil carbon model revealed that transport of SOC down the soil profile, while also a diffusion process, was significantly slower indicating that different processes and/or pathways are involved in SOC transport at this site.]]> Sat 24 Mar 2018 07:27:46 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17880 Mon 23 Sep 2019 14:03:58 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34581 Fri 29 Mar 2019 11:40:28 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53209 Fri 17 Nov 2023 11:40:57 AEDT ]]>