Abstract
Rhizodeposition is considered to be an important source for soil organic carbon. Increased root turnover rates may be a mechanism employed by plants to respond to nutrient limiting conditions. Estimation of rhizodeposition for field-grown oilseed-rape plants (Brassica napus L.) using 14C-pulse labelling technique was the objective of our present work. Treatments consisted of two soil tillage systems (ploughing/surface tillage, ‘Horsch’) and two N rates (0 and 240 kg N/ha). Soil, roots, and shoot were sampled three weeks after labelling and also at the end of the growing season. Rhizodepostion was calculated from the decrease in 14C activity between the sampling dates. Under high N supply retranslocation of assimilates, an increase of root 14C-content which is incompatible with our methodical approach was observed. Therefore, a second experiment was conducted, combining pulse-labelling and ingrowth-core techniques to calculate the transfer of mobile 14C-labelled assimilates to newly formed roots. It is concluded that rhizodeposition accounted for up to 90% of total carbon allocation to the roots (high N supply and ploughing). N supply and soil tillage had pronounced effects on 14C partitioning within the shoot and also high N supply as well as ploughing resulted in reduced 14C allocation to generative organs.
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Literaturverzeichnis
Hendrick, R. L.; Pregliizer, K. S., 1996: Applications of minirhizotrons to understand root function in forests and other natural ecosystems. Plant and Soil 185, 293–304.
Jensen, B., 1993: Rhizodeposition by 14CO2pulse-labelled spring barley grown in small field plots on sandy loam. Soil Biology and Biochemistry 25, 1553–1559.
Merbach, W.; Knof, G.; Augustin, J.; JACOB, H.-J.; JÄGER, R.; TousSANT, V., 1996: Ökophysiologische Wechselbeziehungen zwischen Pflanze und Boden. In: Reaktionsverhalten von Agrarischen Ökosystemen homogener Areale. H. Mühle, S. Claus (Hrsg.). — Stuttgart, Leipzig: B. G. Teubner Verlagsgesellschaft, 195–207.
Sauerbeck, D.; Johnen, B., 1976: Der Umsatz von Pflanzenwurzeln während der Vegetationsperiode und dessen Beitrag zur „Bodenatmung“. Zeitschrift für P flanzenernährung und Bodenkunde 139, 315–328.
Steingrobe, B.; Schmid, H.; Zintel, A.; Claasen, N., 1999: Wurzelerneuerung bei Wintergerste und ihre Bedeutung für die P-Versorgung. In: Stoffumsatz im wurzelnahen Raum. 9. Borkheider Seminar zur Ökophysiologie des Wurzelraumes. W. Merbach, L. Wittenmayer, J. Augustin (Hrsg.) — Stuttgart, Leipzig: B. G. Teubner Verlag, 61–67.
Swinnen, J.; Van Merckx, J. A.; Merckx, R., 1994: 14C-pulse-labelling of field-grown spring wheat: an evaluation of its use in rhizosphere carbon budget estimations. Soil Biology and Biochemistry 26, 161–170.
Swinnen, J.; Van Veen, J. A.; Merckx, R., 1995: Root decay and turnover of rhizodeposits in field-grown winter wheat and spring barley estimated by 14C pulse-labelling. Soil Biology and Biochemistry 27, 211–217.
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© 2000 B.G.Teubner Stuttgart · Leipzig
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Max, J., Sattelmacher, B. (2000). Der Einfluß von Bodenbearbeitung und N-Düngung auf die Verteilung von 14C-markierten Assimilaten auf Sproß und Wurzel sowie auf die Rhizodeposition bei Winterraps. In: Merbach, W., Wittenmayer, L., Augustin, J. (eds) Rhizodeposition und Stoffverwertung. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-80025-1_9
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DOI: https://doi.org/10.1007/978-3-322-80025-1_9
Publisher Name: Vieweg+Teubner Verlag
Print ISBN: 978-3-519-00323-6
Online ISBN: 978-3-322-80025-1
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