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  • 1
    Language: English
    In: Geoderma, May, 2013, Vol.199, p.90(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.geoderma.2012.10.017 Byline: Claudia Dierke, Ulrike Werban Keywords: Mobile gamma-ray spectrometry; Static Fertilizer Experiment; Plant available potassium; Organic carbon content Abstract: Gamma-ray spectrometry is a fast and cost-efficient tool for carrying out spatial mapping of physical parameters related to soil properties. Therefore there is a rising interest in the method for application in digital soil mapping (DSM). However, the concentration of detected radioactive nuclides, gamma K (gK), U and Th, can be influenced by mineralogy and texture as well as further chemical properties, such as pH or organic carbon content (C.sub.org). In many existing studies, the main influencing property of measured gamma-ray concentration in soils is the texture. Our investigation focuses on a field site with homogeneous texture at the Static Fertilizer Experiment in Bad Lauchstadt. However, the plot is characterized by high range in C.sub.org and plant-available potassium (paK) due to specific long-time fertilization. In our study we tested gamma-ray spectrometry as a potential method for mapping C.sub.org and paK at a test site with very low variation in texture in dependency of pH value. The survey was realised using stop-and-go measurements with a mobile gamma-ray spectrometer. We found a negative correlation between pH value and Th for pH〈7. Above this value no correlation can be observed. We have seen no relationship between gK and U/K with C.sub.org, as well as between gK and paK, as found in previous studies. A negative correlation for C.sub.org and paK content with Th at pH〈7 was observed. A pH of 7 was found to be a threshold. Above this pH level we found no correlations. We show that gamma-ray data can be used as indicator for mapping of C.sub.org in areas with low variations in texture below a pH of 7. In our study gK and U were influenced by soil water content, which is important to be considered for interpretation of data measured at different time steps in humid climates. Our study shows the complexity of relationships between gamma-ray nuclides and soil properties, even for a field site with homogenous texture. In general, we recommend for application of gamma-ray spectrometry in DSM, e.g. at catchment scale, it is necessary to record the pH and the soil water content at the time of measurement. Article History: Received 7 September 2011; Revised 28 September 2012; Accepted 15 October 2012
    Keywords: Gamma Rays -- Chemical Properties ; Soil Moisture -- Chemical Properties ; Fertilizers -- Usage ; Fertilizers -- Chemical Properties
    ISSN: 0016-7061
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: Geoderma, May 2013, Vol.199, pp.90-98
    Description: Gamma-ray spectrometry is a fast and cost-efficient tool for carrying out spatial mapping of physical parameters related to soil properties. Therefore there is a rising interest in the method for application in digital soil mapping (DSM). However, the concentration of detected radioactive nuclides, gamma K (gK), U and Th, can be influenced by mineralogy and texture as well as further chemical properties, such as pH or organic carbon content (C ). In many existing studies, the main influencing property of measured gamma-ray concentration in soils is the texture. Our investigation focuses on a field site with homogeneous texture at the Static Fertilizer Experiment in Bad Lauchstädt. However, the plot is characterized by high range in C and plant-available potassium (paK) due to specific long-time fertilization. In our study we tested gamma-ray spectrometry as a potential method for mapping C and paK at a test site with very low variation in texture in dependency of pH value. The survey was realised using stop-and-go measurements with a mobile gamma-ray spectrometer. We found a negative correlation between pH value and Th for pH 〈 7. Above this value no correlation can be observed. We have seen no relationship between gK and U/K with C as well as between gK and paK, as found in previous studies. A negative correlation for C and paK content with Th at pH 〈 7 was observed. A pH of 7 was found to be a threshold. Above this pH level we found no correlations. We show that gamma-ray data can be used as indicator for mapping of C in areas with low variations in texture below a pH of 7. In our study gK and U were influenced by soil water content, which is important to be considered for interpretation of data measured at different time steps in humid climates. Our study shows the complexity of relationships between gamma-ray nuclides and soil properties, even for a field site with homogenous texture. In general, we recommend for application of gamma-ray spectrometry in DSM, e.g. at catchment scale, it is necessary to record the pH and the soil water content at the time of measurement. ► Gamma-ray measurements applied on field with homogeneous texture. ► Field site is characterized by high range in C , paK and P. ► Gamma-ray can be used for mapping of C , depending on pH. ► Recording pH and soil moisture during survey for application in DSM is required.
    Keywords: Mobile Gamma-Ray Spectrometry ; Static Fertilizer Experiment ; Plant Available Potassium ; Organic Carbon Content ; Agriculture
    ISSN: 0016-7061
    E-ISSN: 1872-6259
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  • 3
    Language: English
    In: Geoderma, 2013, Vol.199, pp.90-98
    Description: Gamma-ray spectrometry is a fast and cost-efficient tool for carrying out spatial mapping of physical parameters related to soil properties. Therefore there is a rising interest in the method for application in digital soil mapping (DSM). However, the concentration of detected radioactive nuclides, gamma K (gK), U and Th, can be influenced by mineralogy and texture as well as further chemical properties, such as pH or organic carbon content (Cₒᵣg). In many existing studies, the main influencing property of measured gamma-ray concentration in soils is the texture. Our investigation focuses on a field site with homogeneous texture at the Static Fertilizer Experiment in Bad Lauchstädt. However, the plot is characterized by high range in Cₒᵣg and plant-available potassium (paK) due to specific long-time fertilization. In our study we tested gamma-ray spectrometry as a potential method for mapping Cₒᵣg and paK at a test site with very low variation in texture in dependency of pH value. The survey was realised using stop-and-go measurements with a mobile gamma-ray spectrometer. We found a negative correlation between pH value and Th for pH〈7. Above this value no correlation can be observed. We have seen no relationship between gK and U/K with Cₒᵣg, as well as between gK and paK, as found in previous studies. A negative correlation for Cₒᵣg and paK content with Th at pH〈7 was observed. A pH of 7 was found to be a threshold. Above this pH level we found no correlations. We show that gamma-ray data can be used as indicator for mapping of Cₒᵣg in areas with low variations in texture below a pH of 7. In our study gK and U were influenced by soil water content, which is important to be considered for interpretation of data measured at different time steps in humid climates. Our study shows the complexity of relationships between gamma-ray nuclides and soil properties, even for a field site with homogenous texture. In general, we recommend for application of gamma-ray spectrometry in DSM, e.g. at catchment scale, it is necessary to record the pH and the soil water content at the time of measurement. ; p. 90-98.
    Keywords: Fertilizers ; Soil Ph ; Soil Water Content ; Radionuclides ; Texture ; Watersheds ; Mineralogy ; Gamma Radiation ; Humid Zones ; Carbon ; Potassium ; Soil Surveys ; Spectroscopy
    ISSN: 0016-7061
    Source: AGRIS (Food and Agriculture Organization of the United Nations)
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  • 4
    Language: English
    In: Vadose Zone Journal, 2013, Vol.12(4), p.0
    Description: The identification of spatial and temporal patterns of soil properties and moisture structures is an important challenge in environmental and soil monitoring as well as for soil landscape model approaches. This work examines the use of hyperspectral remote sensing techniques for quantifying geophysical parameters from the hyperspectral reflectance of the vegetation canopy. These can be used as proxies of the underlying soil and soil water conditions. Different spectral index derivatives, single band reflectance, and spectral indices from the airborne hyperspectral sensor AISA were quantified and tested in univariate and multivariate regression models for their correlation with geophysical measurements with electromagnetic induction (EMI) and gamma-ray spectrometry. The best univariate models for predicting electrical conductivity based on spectral information were based on the vertical dipole of an EM38DD with an R (super 2) = 0.54 with the spectral index Normalized Pigments Reflectance Index (NPCI) as well as for the horizontal dipole of an EM38DD with an R (super 2) = 0.65 with the spectral index NPCI. For predicting soil characteristics measured with gamma-ray spectrometry we received the best model results for gamma Th with an R (super 2) = 0.55 with the spectral index NPCI and gamma K with an R (super 2) = 0.44 with the spectral index Triangular Vegetation Index (TVI) and NPCI. The combination of variables including the geographical elevation was tested as the input for a multivariate regression analysis. For EMI and gamma-ray measurements, the "elevation" was found to be the most predictive variable and an integration of spectral indices into the elevation-based model led to only a slight improvement in the predictive power for EMI. An improvement could be made to explain the variance of gamma-ray measurement signals by combining elevation and spectral information.
    Keywords: Applied Geophysics ; Soils ; Airborne Methods ; Biochemistry ; Biophysics ; Central Europe ; Data Processing ; Elastic Waves ; Electrical Conductivity ; Electromagnetic Induction ; Electromagnetic Methods ; Elevation ; Europe ; Field Studies ; Fluvial Features ; Gamma-Ray Methods ; Gamma-Ray Spectra ; Geophysical Methods ; Geophysical Surveys ; Germany ; Global Positioning System ; Ground Methods ; Heterogeneity ; Hyperspectral Analysis ; Indicators ; Infrared Spectra ; Landform Description ; Landscapes ; Mapping ; Measurement ; Monitoring ; Multivariate Analysis ; Photochemistry ; Photosynthesis ; Quantitative Analysis ; Radioactivity Methods ; Regression Analysis ; Remote Sensing ; Rosslau Germany ; Rosslauer Oberluch ; Saxony-Anhalt Germany ; Short-Period Waves ; Soils ; Spatial Distribution ; Spectra ; Statistical Analysis ; Surveys ; Temporal Distribution ; Univariate Analysis ; Unsaturated Zone ; Vegetation;
    ISSN: Vadose Zone Journal
    E-ISSN: 1539-1663
    Source: CrossRef
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