Carbon mineralization and stabilization in soils in response to different crop rotations and tillage treatments
Abstract
Despite our actual knowledge of soil C dynamics, which is based on numerous experiments and investigations, distinct uncertainties exist in evaluating size and turnover time of soil C pools. As a result, very few data concerning soil organic C dynamics are available for calibrating and evaluating various C models. There is only little knowledge about the mechanisms and rates of C entering into various "labile" or "active" and "recalcitrant" SOM pools (Wang and Hsieh, 2002). Nevertheless, the knowledge of the size and turnover rate of these C pools and the C fluxes between these pools is essential to improve existing C balance models. The long-term 14C turnover field experiment, established in 1967 in Fuchsenbigl, Lower Austria, offers the unique possibility to follow the fate of labelled C under different crop management systems (bare fallow, spring wheat, crop rotation) over a period of more than 35 years. Therefore, it should be possible to achieve further essential information about C turnover rates and fluxes especially regarding to C pools with rather slow turnover rates but large pool sizes (physically stabilized or recalcitrant organic matter). Measurements of C pools and mineralizeable C in 1997 (Stemmer et al., 2000) gave strong evidence that a distinct amount of the applied 14C is still mineralizable and the physically stabilized C fraction is enriched in 14C indicating a slower humification rate than proposed by numerous C mineralization models. Both facts underline uncertainties in the estimated pool sizes and C fluxes of existing C balancing models. The main objective of our project is to gain an advanced insight into the dynamics of slow SOC pools in agricultural soils as driven by different management options. Especially the comparison of size fractions at different times after start of the two Austrian long-term field experiments in combination with 14C labelling provides a realistic chance to estimate the fluxes between physically and chemically protected SOC. We will try to achieve this goal by: (i) Linking SOM pool sizes, structure and turnover, which are accessible from particle size fractions of some selected soil samples, to chemical fractionation and spectroscopic analyses of bulk soil samples without fractionation. This link between physical and chemical fractionation should essentially support our understanding of the role of humic substances in the stabilization process. (ii) Modelling of C-balances and C-dynamics to further improve existing C turnover models and to accomplish our understanding of C turnover and sequestration under different crop and soil management systems.
soil organic matter mineralization/stabilization 14C particle size fractionation long term field experiment
Publikationen
Carbon dynamics in two Austrian long-term field experiments: crop rotations and tillage
Autoren: Tatzber, M., Stemmer, M., Haberhauer, G., Spiegel, H., Katzlberger, C., Gerzabek, M.H. Jahr: 2006
Conference & Workshop proceedings, paper, abstract
Carbon mineralization and stabilization in soils in response to different crop rotations and tillage treatments
Autoren: Tatzber, M., Stemmer, M., Haberhauer, G., Spiegel, H., Katzlberger, C., Gerzabek, M.H. Jahr: 2006
Conference & Workshop proceedings, paper, abstract
An alternative method to measure carbonate in soils by FT-IR spectroscopy
Autoren: M. Tatzber · M. Stemmer · H. Spiegel · C. Katzlberger · G. Haberhauer · M. H. Gerzabek Jahr: 2006
Journal articles
Kohlenstoffmineralisation und -stabilisierung in Böden unter verschiedenen Ernteabfolgen und Bearbeitungsmethoden
Autoren: Tatzber, M., Stemmer, M., Haberhauer, G., Spiegel, H., Katzlberger, C., Gerzabek, M.H. Jahr: 2006
Journal articles
Carbon stabilization in soils in response to different tillage treatments and crop rotations
Autoren: Tatzber, M; Stemmer, M; Spiegel, H; Katzelberger, C; Haberhauer, G; Gerzabek, M H Jahr: 2007
Journal articles
Does the Rothamsted carbon model (RothC 26.3) properly predict soil carbon turnpover and storage in arable soils under Pannonian climate conditions?
Autoren: Rampazzo Todorovic, G., M. Stemmer, M. Tatzber, C. Katzlberger, H. Spiegel, M.H. Gerzabek Jahr: 2008
Conference & Workshop proceedings, paper, abstract
Impact of different tillage practices on molecular characteristics of humic acids in a long-term field experiment - an application of three different spectroscopic methods.
Autoren: Tatzber, M; Stemmer, M; Spiegel, H; Katzlberger, C; Haberhauer, G; Gerzabek, MH; Jahr: 2008
Journal articles
Soil organic matter dynamics as revealed by a 14C labelling long-term field experiment in Lower Austria
Autoren: Gerzabek, M.H., Tatzber, M., Rampazzo-Todorovic, G., Zehetner, F. Jahr: 2009
Conference & Workshop proceedings, paper, abstract
Spectroscopic behaviour of C-14-labeled humic acids in a long-term field experiment with three cropping systems
Autoren: Tatzber, M; Stemmer, M; Spiegel, H; Katzlberger, C; Zehetner, F; Haberhauer, G; Garcia-Garcia, E; Gerzabek, MH Jahr: 2009
Journal articles
C-14-labeled organic amendments: Characterization in different particle size fractions and humic acids in a long-term field experiment
Autoren: Tatzber, M; Stemmer, M; Spiegel, H; Katzlberger, C; Landstetter, C; Haberhauer, G; Gerzabek, MH Jahr: 2012
Journal articles
Project staff
Martin Gerzabek
Univ.Prof. Dipl.-Ing. Dr. Dr.h.c.mult. Martin Gerzabek
martin.gerzabek@boku.ac.at
Tel: +43 1 47654-91112
Project Staff
01.03.2004 - 15.07.2007
BOKU partners
External partners
Austrian Research Centers
Dr. Michael Jakusch
partner
Österreichische Agentur für Gesundheit- und Ernährungssicherheit GmbH - Landwirtschaftliche Untersuchungen und Forschung Wien
Dr. Adelheid Spiegel
partner