Analysis of the Soil Sand Fraction and Recent Sediments Deposits
| Autor: | Renata Cristina Bovi, Miguel Cooper, Camila Carolina de Carvalho, Raquel Stucchi Boschi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Soil test
Soil Science Sediment Soil science 04 agricultural and veterinary sciences 010502 geochemistry & geophysics Roundness (geology) 01 natural sciences Grain size Skewness 040103 agronomy & agriculture Kurtosis 0401 agriculture forestry and fisheries Soil horizon Geology 0105 earth and related environmental sciences Sand fraction |
| Zdroj: | Soil Science. 181:513-519 |
| ISSN: | 0038-075X |
| DOI: | 10.1097/ss.0000000000000184 |
| Popis: | In this study, we propose a methodology (ImaGrain) for quantifying the sand fractions from two-dimensional images obtained from thin sections of undisturbed soil samples. Samples for this analysis were collected from soil horizons and sediment layers of two profiles and two pits, located in the Experimental Station of Tupi, Piracicaba, Sao Paulo, Brazil. Data from image analysis were used to calculate the mean, median, S.D. (a measure of sorting), skewness, and kurtosis of the size distribution of sand grains, and the results were compared with those obtained with the sieving (standard) method. Roundness of the sand grains was quantified with the ImaGrain method. The results showed that both methods classify the mean grain size as fine sand and that the values of S.D., skewness, and kurtosis for all samples were also similar. The sand grains of the sediment layers and soil horizons had similar degrees of sand grain roundness with a dominance of rounded and moderately rounded sand grains. Based on our results, ImaGrain should be explored further as a tool to quantify the soil sand fraction and for determining transport and deposition patterns. Image analysis also allows classifying the sand grain roundness, an important parameter that is not determined by the standard method. |
| Databáze: | OpenAIRE |
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