Aufsatz in einer Fachzeitschrift
Effect of fertilization on respiration from different sources in a sandy soil of an agricultural long-term experiment
Details zur Publikation
Autor(inn)en: | Heitkamp, F.; Jäger, N.; Flessa, H.; Raupp, J.; Ludwig, B. |
Verlag: | TAYLOR & FRANCIS LTD |
Publikationsjahr: | 2012 |
Zeitschrift: | Journal of Plant Nutrition |
Seitenbereich: | 933-944 |
Jahrgang/Band : | 58 |
Heftnummer: | 9 |
Erste Seite: | 933 |
Letzte Seite: | 944 |
Seitenumfang: | 12 |
ISSN: | 0190-4167 |
DOI-Link der Erstveröffentlichung: |
Zusammenfassung, Abstract
Annual changes in stocks of soil organic carbon may be detected by measurement of heterotrophic respiration, but field studies of heterotrophic respiration in long-term fertilization experiments on sandy soils are scarce. Our objectives were to: (1) investigate the influence of fertilizer type on mineralization of soil organic carbon and crop residue, and (2) show how fertilization treatments affect the annual C balance (net ecosystem carbon balance, NECB; negative values indicate a CO2-source) in the sandy soil of the Darmstadt experiment. Treatments were long-term mineral fertilization with cereal straw incorporation (MSI) and application of rotted farmyard manure (FYM), both treatments receiving 14 g N m(-2) year(-1). This study used delta C-13 natural abundance after introduction of a C-4 crop to distinguish between different sources of respiration. Mineralization derived from C-3 sources was similar for MSI and FYM treatments (similar to 270 g C m(-2) year(-1)). The rate of residue mineralization in MSI treatments was higher, resulting in a mineralization of 49 and 37% of initial residue C in the soil of MSI and FYM treatments, respectively. The NECB (g C m(-2) year(-1)) indicated the MSI treatment (approximately - 190) as a stronger source compared with the FYM treatment (similar to-30).
Annual changes in stocks of soil organic carbon may be detected by measurement of heterotrophic respiration, but field studies of heterotrophic respiration in long-term fertilization experiments on sandy soils are scarce. Our objectives were to: (1) investigate the influence of fertilizer type on mineralization of soil organic carbon and crop residue, and (2) show how fertilization treatments affect the annual C balance (net ecosystem carbon balance, NECB; negative values indicate a CO2-source) in the sandy soil of the Darmstadt experiment. Treatments were long-term mineral fertilization with cereal straw incorporation (MSI) and application of rotted farmyard manure (FYM), both treatments receiving 14 g N m(-2) year(-1). This study used delta C-13 natural abundance after introduction of a C-4 crop to distinguish between different sources of respiration. Mineralization derived from C-3 sources was similar for MSI and FYM treatments (similar to 270 g C m(-2) year(-1)). The rate of residue mineralization in MSI treatments was higher, resulting in a mineralization of 49 and 37% of initial residue C in the soil of MSI and FYM treatments, respectively. The NECB (g C m(-2) year(-1)) indicated the MSI treatment (approximately - 190) as a stronger source compared with the FYM treatment (similar to-30).
Schlagwörter
carbon balance, Farmyard manure, mineral fertilization, mineralization, stable isotopes
