Prediction of vertical soil organic carbon profiles using soil properties and environmental tracer data at an untilled site

Wells, T.; Hancock, Greg; Dever, C.; Murphy, Daniel V.

doi:10.1016/j.geoderma.2011.11.006

Cited by 14 publications

(14 citation statements)

References 71 publications

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“…Hons. thesis;Wells et al 2012Wells et al , 2013Wells and Hancock 2014;Kunkel et al 2016Kunkel et al , 2019Hancock et al 2019). The Krui catchment extends over 31°49-32°13 0 S and 150°02-150°21 0 E, with elevations ranging from approximately 200 m in the south (Merriwa Plateau) to 1200 m in the north (Liverpool Range).…”

Section: Site Descriptionmentioning

confidence: 99%

“…material moving along a wetting front, illuviation of clay) as well as more immediate (i.e. cracks allowing direct movement of surface material down the profile) (Wells et al 2012(Wells et al , 2013Wells and Hancock 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Upon arrival on the soil surface by both wet and dry deposition at the soil surface (Elliott et al 1997), 137 Cs becomes strongly bound to the clay component of soil. The 137 Cs arrived via rainfall onto the soil surface and is known to migrate via diffusive processes (Wells et al 2012(Wells et al , 2013. However, surface labelled soil can be eroded and transported both laterally and vertically.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the literature regarding the relationship between SOC and 137 Cs appears to be well established, with similar conclusions reported at various study sites throughout the world. The presence of 137 Cs in soil can therefore infer (1) depth of migration of surface material by both advective and diffusive processes and (2) a potential rate at which surface material migrates to that depth (Wells et al 2012(Wells et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Understanding and quantifying whole soil-profile organic carbon transfer using an environmental tracer

Hancock

2023

Soil Res.

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Context Quantifying soil organic carbon (SOC) depth distribution and its vertical transport is needed for both improved understanding of soil properties and behaviour as well as enhanced organic carbon sequestration. This is a global issue, that if better understood, could result in both more agriculturally productive soils as well as enhanced environmental outcomes. Aims Quantify whole soil-profile SOC and down-profile movement at a series of sites in south-east Australia. Methods Soil is sampled at regular intervals using cores and assessed for SOC and environmental tracer (137Cs) concentration. Key results Soils that have a high clay content (Vertosols) and crack (i.e. self mulching) have the highest SOC content. In high clay content soils, 137Cs is present at depths well below that at which it would be present by diffusive processes. Conclusions Surface soil, labelled with 137Cs is moving down the soil profile by advective processes to depths well below that possible by diffusive processes alone. Using local erosion rates and carbon input, it is estimated that less than 1% of SOC is delivered to the cracking soils by erosional processes and that the majority of SOC must be produced in situ. Implications Given that 137Cs is a relatively new environmental tracer (1945 onwards), this suggests that surface labelled soil is reaching depths of up to 80 cm at decadal time scales. The methods and findings here have global applicability and provide insights into potential enhancement of carbon sequestration in both cropping and grazing landscapes.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding and quantifying whole soil-profile organic carbon transfer using an environmental tracer

Hancock

2023

Soil Res.

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“…Here, both 137 Cs and 210 Pb ex are used to understand SOC and soil erosion and deposition patterns on a relatively steep slope (~30%) in south-east Australia. This study forms part of a long-term investigation of hillslope geomorphology in the south-east region of Australia (Rüdiger et al 2007;Martinez et al 2009Martinez et al , 2010Hancock et al 2010Hancock et al , 2015Wells et al 2012;Wells and Hancock 2014;Chen et al 2015;Kunkel et al 2016Kunkel et al , 2019Hancock and Wells 2021). There appears to be few studies where the two tracers have been directly used and compared in this way.…”

Section: Introductionmentioning

confidence: 99%

Using environmental tracers to understand soil organic carbon and soil erosion on a steep slope hillslope in south-east Australia

Hancock

2023

Soil Res.

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Context It is well recognised that soil organic carbon (SOC) can be transported and deposited along the same pathways as those of soil erosion and deposition. Aims To examine the viability of environmental tracers 137Cs and unsupported 210Pb (210Pbex) as tools to inform soil erosion and deposition patterns as well as that of the distribution of SOC. Methods Multiple soil cores were collected along two transects of similar length and aspect in a steep-slope soil mantled environment in south-east Australia. Key results Average SOC concentration was high for both transects (~6% and 4%). SOC decreased moving downslope suggesting loss of SOC by erosion. There were strong and significant positive relationships of SOC with 137Cs and 210Pbex (both r > 0.77, P < 0.0001). At this site, SOC concentration appears related to erosion and deposition patterns. Conclusion The hillslope distribution of 137Cs and 210Pbex were very similar, indicating that both tracers were viable in this environment (r = 0.9, P < 0.0001). The different origins and half-lives of 137Cs and 210Pbex also demonstrate that the patterns of erosion and deposition are consistent at decadal time scales. Implications The use of 210Pbex provides an alternative method for understanding erosion and deposition patterns as well as that of SOC, given that the viability of 137Cs (half-life of 30.1 years) is now questionable due to no new replenishment.

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Biofuel Crops and Soil Quality and Erosion

Chatskikh¹,

Овчинникова²,

Seshadri³

et al. 2013

Biofuel Crop Sustainability

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Prediction of vertical soil organic carbon profiles using soil properties and environmental tracer data at an untilled site

Cited by 14 publications

References 71 publications

Understanding and quantifying whole soil-profile organic carbon transfer using an environmental tracer

Understanding and quantifying whole soil-profile organic carbon transfer using an environmental tracer

Using environmental tracers to understand soil organic carbon and soil erosion on a steep slope hillslope in south-east Australia

Biofuel Crops and Soil Quality and Erosion

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