U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            MADARI, BEATA - EMBRAPA RICE AND BEANitem
                                            Reeves  Iii, Jamesitem
                                            COELHO, MAURICO - EMBRAPA SOILSitem
                                            MACHADO, PEDRO - EMBRAPA RICE AND BEANitem
                                            DEPOLLI, HELVECIO - EMBRAPA AGROBIOLOGYitem
                                            COELHO, RICHARDO - IAC CAMPINASitem
                                            DE MELO BENITES, VINICIUS - EMBRAPA SOILSitem
                                            DE SOUZA, LUCAS - EMBRAPA SOILSitem
                                            McCarty, Gregory
  Submitted to: Popular Publication
                                    Publication Type: Popular Publication
                                    Publication Acceptance Date: 7/22/2007
                                    Publication  Date: 7/22/2007
                                    Citation: Madari, B.E., Reeves  III, J.B., Coelho, M.R., Machado, P.L., Depolli, H., Coelho, R.M., De Melo Benites, V., De Souza, L.F., Mccarty, G.W. 2007. Espectroscopia infravermelha para a determinacao de carbono do solo:  Perspectiva de um metodo economicamente viavel e ambientalmente seguro. Web publication #126 at http://www.cnpaf.embrapa.br/publicacao/comunicadotec/.Interpretive Summary: The Kyoto Protocol is stimulating the establishment of national soil carbon inventories and is motivating the implementation of projects that promote carbon accumulation in terrestrial ecosystems. To be able to effectively monitor such projects methods that are able to analyze vast number of samples within a reduced time period are needed. Currently standard methods of soil carbon analysis are either slow, require the use of toxic reagents (Walkley-Black method and its variations, Yeomens-Bremner method and its variations) or have accuracy problems (loss-on-ignition). Spectroscopic techniques like near-infrared reflectance spectroscopy (NIRS) and diffuse reflectance Fourier transform spectroscopy (DRIFTS), combined with chemometrics, can simultaneously determine any number of variables, including different carbon forms. The objective of this work was to show the utility of these techniques in the quantitative determination of total and organic soil carbon using a representative set of soils from Brazil. It was demonstrated that both NIRS and DRIFTS can be used even in the case of very diverse sample populations. However, depending on the level of accuracy needed, the creation of subpopulations of soil samples may be needed, based on their textural properties. Near-infrared reflectance spectroscopy could be used for less diverse sample populations, for example, where all samples belong to the very clayey textural group. Using DRIFTS more robust calibrations can be achieved and also for more diverse sample populations. Based on this, for quantitative carbon analysis in soils, DRIFTS appears to be a very promising alternative for standard carbon analysis.
                                Technical Abstract: The Kyoto Protocol is an agreement among many of the world’s nations to, among other things, reduce atmospheric carbon dioxide concentrations in order to reduce global warming. One potential method to do so is to sequester carbon in soils. This has had the effect of stimulating the establishment of national soil carbon inventories and is motivating the implementation of projects that promote carbon accumulation in terrestrial ecosystems (soils, trees, etc.). To be able to effectively monitor such projects methods that are able to analyze vast number of samples within a reduced time period are needed. Currently standard methods of soil carbon analysis are either slow, require the use of toxic reagents or have accuracy problems. Spectroscopic techniques like near-infrared reflectance spectroscopy (NIRS) and diffuse reflectance Fourier transform spectroscopy (DRIFTS), combined with chemometrics (mathematical methods for relating the spectral information to chemical composition), can simultaneously determine any number of variables, including different carbon forms. The objective of this work was to show the utility of these techniques in the quantitative determination of total and organic soil carbon using a representative set of soils from Brazil. It was demonstrated that both NIRS and DRIFTS can be used even in the case of very diverse sample populations. However, depending on the level of accuracy needed, the creation of subpopulations of soil samples may be needed based on their textural propertied (sand, silt and clay contents). Near-infrared reflectance spectroscopy could be used for less diverse sample populations, for example, where all samples belong to the very clayey textural group. Using DRIFTS more robust calibrations can be achieved and also for more diverse sample populations. Based on this, for quantitative carbon analysis in soils, DRIFTS appears to be a very promising alternative for standard carbon analysis.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov