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000056225 0247_ $$2DOI$$a10.1016/j.soilbio.2008.07.007
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000056225 084__ $$2WoS$$aSoil Science
000056225 1001_ $$0P:(DE-HGF)0$$aSteinbeiss, S.$$b0
000056225 245__ $$aMechanisms of short-term soil carbon storage in experimental grasslands
000056225 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2008
000056225 300__ $$a2634 - 2642
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000056225 440_0 $$08461$$aSoil Biology and Biochemistry$$v40$$x0038-0717
000056225 500__ $$aThis work was part of the project (GL 262-6) that was funded by the Deutsche Forschungsgemeinschaft within the scope of the Biodiversity Research Group (FOR 456) with support from the Friedrich Schiller University, Jena and the Max Planck Society. We gratefully acknowledge all the people that were involved in the planning and set-up of the experiment, especially E.-D. Schulze, W.W. Weisser, B. Schmid, J. Schumacher, and C. Roscher. We acknowledge the help of Y. Oelmann and W. Wilcke in installation of the equipment and their assistance in soil solution sampling. We wish to thank all the student helpers that assisted in sampling campaigns and sample preparation, for example C. Noll, C. Seidel, M. Pieles, K. Muller, and K. Wurfel. Many thanks go to the gardeners, S. Eismann, S. Junghans, B. Lenk, H. Scheffler, and U. Wehmeier, as well as the numerous student helpers who maintained the field site by weeding and regular maintenance work. We thank O. Kolle and his team for the steady supply of data from the weather station at the field site. We thank N. Buchmann for being the principal investigator of the plant ecophysiological subgroup and thus making sure that community plant stable isotope (<SUP>13</SUP>C) measurements in the main plots of the experiment were part of the package of measurements made.
000056225 520__ $$aWe investigated the fate of root and litter derived carbon in soil organic matter and dissolved organic matter in soil profiles, in order to explain mechanisms of short-term soil carbon storage. A time series of soil and soil solution samples was investigated at the field site of The Jena Experiment between 2002 and 2004. In addition to the main experiment with C3 plants, a C4 species (Amaranthus retroflexus L) naturally labeled with C-13 was grown on an extra plot. Changes in organic carbon concentration in soil and soil solution were combined with stable isotope measurements to follow the fate of plant carbon into the soil and soil solution. A split plot design with plant litter removal versus double litter input simulated differences in biomass input. After 2 years, the no litter and double litter treatment, respectively, showed an increase of 381 g C m(-2) and 263 g C m(-2) to 20 cm depth, while 71 g C m(-2) and 393 g C m(-2) were lost between 20 and 30 cm depth. The isotopic label in the top 5 cm indicated that 115 g C m-2 and 156 g C m(-2) of soil organic carbon were derived from C4 plant material on the no litter and the double litter treatment, respectively. Without litter, this equals the total amount of 97 g C m(-2) that was newly stored in the same soil depth, whereas with double litter this clearly exceeded the stored amount of 75 g C m(-2). Our results indicate that litter input resulted in lower carbon storage and larger carbon losses and consequently accelerated turnover of soil organic carbon. Isotopic evidence showed that inherited soil organic carbon was replaced by fresh plant carbon near the soil surface. Our results suggest that primarily carbon released from soil organic matter, not newly introduced plant organic matter, was transported in the soil solution. However, the total flow of dissolved organic carbon was not sufficient to explain the observed carbon storage in deeper soil layers, and the existence of additional carbon uptake mechanisms is discussed. (C) 2008 Elsevier Ltd. All rights reserved.
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000056225 65320 $$2Author$$aC4 plants
000056225 65320 $$2Author$$aDissolved organic carbon
000056225 65320 $$2Author$$aPriming
000056225 65320 $$2Author$$aSoil organic matter
000056225 65320 $$2Author$$aStable carbon isotopes
000056225 65320 $$2Author$$aJena Experiment
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000056225 7001_ $$0P:(DE-Juel1)129409$$aTemperton, V. M.$$b1$$uFZJ
000056225 7001_ $$0P:(DE-HGF)0$$aGleixner, G.$$b2
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