Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.soilbio.2009.11.019 |
| Titel (primär) | Short-term competition between crop plants and soil microbes for inorganic N fertilizer |
| Autor | Inselsbacher, E.; Hinko-Najera Umana, N.; Stange, C.F.; Gorfer, M.; Schüller, E.; Ripka, K.; Zechmeister-Boltenstern, S.; Hood-Novotny, R.; Strauss, J.; Wanek, W. |
| Quelle | Soil Biology & Biochemistry |
| Erscheinungsjahr | 2010 |
| Department | BOPHY |
| Band/Volume | 42 |
| Heft | 2 |
| Seite von | 360 |
| Seite bis | 372 |
| Sprache | englisch |
| Keywords | Agriculture; Ammonium monooxygenase; Archaea; Bacteria; Fungi; Gross N transformations; Inorganic N fertilizer; qPCR; 15N tracer |
| Abstract | Agricultural systems that receive high amounts of inorganic nitrogen (N) fertilizer in the form of either ammonium (NH4+), nitrate (NO3-) or a combination thereof are expected to differ in soil N transformation rates and fates of NH4+ and NO3-. Using 15N tracer techniques this study examines how crop plants and soil microbes vary in their ability to take up and compete for fertilizer N on a short time scale (hours to days). Single plants of barley (Hordeum vulgare L. cv. Morex) were grown on two agricultural soils in microcosms which received either NH4+, NO3- or NH4NO3. Within each fertilizer treatment traces of 15NH4+ and 15NO3- were added separately. During 8 days of fertilization the fate of fertilizer 15N into plants, microbial biomass and inorganic soil N pools as well as changes in gross N transformation rates were investigated. One week after fertilization 45-80% of initially applied 15N was recovered in crop plants compared to only 1-10% in soil microbes, proving that plants were the strongest competitors for fertilizer N. In terms of N uptake soil microbes out-competed plants only during the first 4 h of N application independent of soil and fertilizer N form. Within one day microbial N uptake declined substantially, probably due to carbon limitation. In both soils, plants and soil microbes took up more NO3- than NH4+ independent of initially applied N form. Surprisingly, no inhibitory effect of NH4+ on the uptake and assimilation of nitrate in both, plants and microbes, was observed, probably because fast nitrification rates led to a swift depletion of the ammonium pool. Compared to plant and microbial NH4+ uptake rates, gross nitrification rates were 3-75-fold higher, indicating that nitrifiers were the strongest competitors for NH4+ in both soils. The rapid conversion of NH4+ to NO3- and preferential use of NO3- by soil microbes suggest that in agricultural systems with high inorganic N fertilizer inputs the soil microbial community could adapt to high concentrations of NO3- and shift towards enhanced reliance on NO3- for their N supply. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=10115 |
| Inselsbacher, E., Hinko-Najera Umana, N., Stange, C.F., Gorfer, M., Schüller, E., Ripka, K., Zechmeister-Boltenstern, S., Hood-Novotny, R., Strauss, J., Wanek, W. (2010): Short-term competition between crop plants and soil microbes for inorganic N fertilizer Soil Biol. Biochem. 42 (2), 360 - 372 10.1016/j.soilbio.2009.11.019 |
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