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土壤圈(英文版). 2005, (06)

Carbon Turnover in a Crop Rotation Under Free Air CO2 Enrichment （FACE）English Full Text

H. J. WEIGEL1, A. PACHOLSKI1, S. BURKART1, M. HELAL1, O. HEINEMEYER1, B. KLEIKAMP1, R. MANDERSCHEID1, C. FRüHAUF2, G. F. HENDREY3, K. LEWIN3 and J. NAGY3 1 Institute of Agroecology, Federal Agricultural Research Centre (FAL), Bundesallee 50, 38116 Braunschweig (Germany). 2 German Weather Service, Agriculture Department, Kreuzweg 25, 65366 Geisenheim (Germany) 3Earth Systems Sciences Division, Brookhaven National Laboratory Building 490D, P.O. Box 5000, Upton, NY 11973 (USA)

Abstract: . Mostly based on assumptions derived from controlled-environment studies, predicted future atmospheric CO2 concen- trations [CO2] are expected to have considerable impacts on carbon （C） turnover in agro-ecosystems. In order to allow the in situ examination of C-transformations in the plant-soil system of arable crop rotations under future [CO2], a free air carbon dioxide enrichment （FACE） experiment （550 μmol mol-1 CO2） was started at Braunschweig, Germany in 1999. The crop rotation under investigation comprised winter barley, a cover crop （ryegrass）, sugar beets and winter wheat. Assessments of CO2 effects included the determination of above- and belowground biomass production, measurements of canopy CO2- and H2O- fluxes, soil microbial biomass and in situ soil respiration. The results obtained during the 1st crop rotation cycle （3 years） showed that for the selected crops elevated [CO2] entailed significant positive effects （P ＜ 0.05） on aboveground （6%-14% stimulation） and belowground biomass production （up to 90% stimulation）, while canopy evapotranspiration was reduced. This resulted in increased soil water content. Also, depending on crop type and season, high CO2 stimulated in situ soil respiration （up to 30%）, while soil microbial biomass did not show significant responses to elevated [CO2] during the first rotation cycle.
Keywords：

agroecosystems; carbon; elevated CO2; FACE; soil;

  • Series：

    (D) Agriculture

  • Subject：

    Agronomy; Fundamental Science of Agriculture

  • Classification Code：

    S154

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