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
 Columbia Plateau Conservation Research Center: Pendleton, OR
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Related TopicsSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Pendleton, Oregon Columbia Plateau Conservation Research Center 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
                                            Gollany, Heroitem
                                            FORTUNA, ANN-MARIE - North Dakota State Universityitem
                                            SAMUEL, MARSHALL - Malaysian Agricultural Research And Developmentitem
                                            Young, Francisitem
                                            PAN, WILLIAM - Washington State Universityitem
                                            PECHARKO, MIKE - Washington State University
  Submitted to: Agronomy Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/11/2013
                                    Publication  Date: 11/2/2013
                                    Citation: Gollany, H.T., Fortuna, A., Samuel, M., Young, F.L., Pan, W., Pecharko, M. 2013. Determining soil organic carbon accretion vs sequestration using physicochemical fractionation and CQESTR simulation. Agronomy Abstracts. Gollany 298-4. CD-ROM, ASA-CSSA-SSSA International Annual Meetings, Madison, WI.Interpretive Summary:
                                Technical Abstract: Accurate estimates of soil organic carbon (SOC) are needed to determine SOC changes resulting from agricultural management practices. The objectives of this study were to: (1) determine total SOC, and estimate contributions of light fraction C (LF-C) and resistant C (RC) to total SOC; and (2) simulate SOC dynamics for three cropping systems in the Pacific Northwest using the CQESTR model. Three cropping systems (sweep-tillage winter wheat (Triticum aestivum L.)-tillage fallow rotation, WW-TF; no-till (NT) spring wheat-chemical fallow rotation, SW-CF/NT; and spring barley (Hordeum vulgare L.)-spring wheat rotation, SB-SW/NT) were established in the summer of 1995, in a randomized complete block design with each rotation replicated four times. Soil samples were taken each year from 1995-2002, and total SOC and LF-C were determined every fall and spring of each year, and RC were determined for spring and fall of 1997 and 2001. Simulated data indicated no significant changes in SOC in the top 30 cm of the WW-TF and SW-CF/NT, however, SOC increased in the SB-SW/NT. Resistant C across cropping systems was not significantly different and constituted an average of 48% of the total SOC. The apparent increase in measured SOC with continuous NT spring cropping was due to accumulated undecomposed crop residues that contributed to the labile C pool, and was confirmed by the LF-C analysis. The contributions of the LF-C to total SOC across cropping systems ranged from 13.4 to 18.4% (fall samples) and 14.4 to 18.9% (spring samples) and increased with time/duration of the study.  The LF-C masked the changes in measured SOC. Differences between the measured and simulated SOC were due to artifacts associated with protocols used to determine SOC that did not completely remove accrued crop residue and was explained by LF-C. [GRACEnet publication].


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