title: Responses of belowground carbon allocation dynamics to extended shading in mountain grassland.
abstract: Carbon (C) allocation strongly influences plant and soil processes. Short-term C allocation dynamics in ecosystems and their responses to environmental changes are still poorly understood. Using in situ (13) CO(2) pulse labeling, we studied the effects of 1 wk of shading on the transfer of recent photoassimilates between sugars and starch of above- and belowground plant organs and to soil microbial communities of a mountain meadow. C allocation to roots and microbial communities was rapid. Shading strongly reduced sucrose and starch concentrations in shoots, but not roots, and affected tracer dynamics in sucrose and starch of shoots, but not roots: recent C was slowly incorporated into root starch irrespective of the shading treatment. Shading reduced leaf respiration more strongly than root respiration. It caused no reduction in the amount of (13) C incorporated into fungi and Gram-negative bacteria, but increased its residence time. These findings suggest that, under interrupted C supply, belowground C allocation (as reflected by the amount of tracer allocated to root starch, soil microbial communities and belowground respiration) was maintained at the expense of aboveground C status, and that C source strength may affect the turnover of recent plant-derived C in soil microbial communities.
authors: Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020, Innsbruck, Austria.
authors: Michael
authors: M
authors: Bahn
authors: Technische Universität München, Lehrstuhl für Grünlandlehre, Alte Akademie 12, D-85350, Freising-Weihenstephan, Germany.
authors: Fernando A
authors: FA
authors: Lattanzi
authors: Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020, Innsbruck, Austria.
authors: Roland
authors: R
authors: Hasibeder
authors: Department of Terrestrial Ecosystem Research, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
authors: Birgit
authors: B
authors: Wild
authors: Department of Terrestrial Ecosystem Research, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
authors: Marianne
authors: M
authors: Koranda
authors: Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020, Innsbruck, Austria.
authors: Valentina
authors: V
authors: Danese
authors: Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, Agrosphere Institute (IBG-3), Leo-Brandt-Straße, 52425, Jülich, Germany.
authors: Nicolas
authors: N
authors: Brüggemann
authors: Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020, Innsbruck, Austria.
authors: Michael
authors: M
authors: Schmitt
authors: Paul Scherrer Institute, 5232, Villigen PSI, Switzerland.
authors: Rolf
authors: R
authors: Siegwolf
authors: Department of Terrestrial Ecosystem Research, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
authors: Andreas
authors: A
authors: Richter
mesh_terms: D000531:Altitude; D000704:Analysis of Variance; D018533:Biomass; D050260:Carbohydrate Metabolism; D002244:Carbon / Q000378:metabolism*; D002247:Carbon Isotopes; D019069:Cell Respiration; D017753:Ecosystem; D010743:Phospholipids / Q000378:metabolism; D018515:Plant Leaves / Q000502:physiology; D018517:Plant Roots / Q000502:physiology; D006109:Poaceae / Q000502:physiology*; D013213:Starch / Q000378:metabolism; D013395:Sucrose / Q000378:metabolism; D013997:Time Factors
chemical_list: D002247:Carbon Isotopes; D010743:Phospholipids; D013395:Sucrose; D002244:Carbon; D013213:Starch
references: Ecology. 2010 Jan;91(1):166-79
references: 20380206
references: Mycorrhiza. 2011 Nov;21(8):689-702
references: 21472448
references: New Phytol. 2012 Jan;193(1):30-50
references: 22085245
references: Tree Physiol. 2012 Jun;32(6):764-75
references: 22302370
references: Plant Physiol. 1998 Aug;117(4):1281-91
references: 9701583
references: Plant Cell Environ. 2009 Jul;32(7):859-74
references: 19236606
references: New Phytol. 2009 Dec;184(4):950-61
references: 19843305
references: J Exp Bot. 2010 Mar;61(5):1375-83
references: 20159885
references: Tree Physiol. 2012 Jun;32(6):776-98
references: 22700544
references: Biogeosciences. 2010 Jul 9;7(7):2147-2157
references: 23293656
references: Soil Biol Biochem. 2010 Sep;42(9):1650-1652
references: 21633516
references: New Phytol. 2001 Mar;149(3):419-430
references: 33873337
references: Biogeosciences. 2010 Aug;7(8):2297-2309
references: 23293657
references: New Phytol. 2010 Nov;188(3):719-25
references: 20819178
references: Proc Natl Acad Sci U S A. 2010 Jun 15;107(24):10938-42
references: 20534474
references: New Phytol. 2009;182(2):451-460
references: 19220762
references: New Phytol. 2008;177(1):220-228
references: 17944822
references: New Phytol. 2010 Jul;187(2):485-493
references: 20456043
references: New Phytol. 2006;172(3):544-53
references: 17083684
references: New Phytol. 2012 Oct;196(1):79-91
references: 22924405
references: Plant Physiol. 2008 Oct;148(2):1148-58
references: 18715953
references: Trends Plant Sci. 2011 Mar;16(3):169-75
references: 21216654
references: Plant Cell Environ. 2007 Sep;30(9):1126-49
references: 17661751
references: Soil Biol Biochem. 2011 Mar;43(3):551-558
references: 21412402
references: Rapid Commun Mass Spectrom. 2000;14(15):1345-50
references: 10920353
references: New Phytol. 2011 Dec;192(4):925-938
references: 21851360
references: Rapid Commun Mass Spectrom. 2006;20(4):653-60
references: 16444688
references: Rapid Commun Mass Spectrom. 2009 Aug 30;23(16):2476-88
references: 19603463
references: New Phytol. 2012 Jul;195(2):285-289
references: 22568553
references: New Phytol. 2010 Aug;187(3):843-58
references: 20553392
references: New Phytol. 2009;184(1):19-33
references: 19740278
references: Biochem J. 2007 Jan 1;401(1):13-28
references: 17150041