Chapter 12. Comparative assessment of soil bulk density by computerized tomography methods for carbon stock quantification

In: Sustainable agroecosystems in climate change mitigation
Authors:
A. Segnini
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C.M. P. Vaz
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A. Posadas
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M. D. Guastal
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P.R. O. Lasso
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A.C.C. Bernardi
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D.M.B P. Milori
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Type:
Chapter
Pages:
237–248
DOI:
https://doi.org/10.3920/978-90-8686-788-2_12

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Soil carbon (C) concentration and soil bulk density are essential parameters used to quantify soil C stocks and the potential of soil C sequestration. Bulk density was traditionally assessed by gravimetric methods but gamma ray computed tomography can be used to quantify variations in bulk density within the soil profile. Tomographic methods measure soil physical properties without disturbing the soil, and X-ray microtomography provides high resolution cross-section images of an object to create a virtual 3 dimensional-model of the object. As such, it was assumed that this technique may also be applied to evaluate soil bulk density. The objective of this study was to compare computerized tomographic results to estimate the bulk density of soils of different textures and under different management conditions. Results were compared with bulk density values determined by classical methods as volumetric ring or paraffin sealed clod methods. Comparisons among linear attenuation coefficients were undertaken to correlate them linearly with the soil bulk density parameter for each soil. However, some factors such as beam hardening effect and the polychromatic nature of X-rays microtomography make it difficult to directly quantify soil bulk density.

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Cover Sustainable agroecosystems in climate change mitigation
E-Book ISBN:
9789086867882
Publisher:
Wageningen Academic
Print Publication Date:
08 Apr 2014
Section 1. Opportunities for carbon sequestration in agroecosystems
Section 2. Greenhouse gas emissions from agroecosystems
Section 3. Nutrient dynamics and microbe interactions
Section 4. New tools: analytical methods and modeling

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