Full TGIF Record # 55975
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Author(s):Kandler, E.; Tscherko, D.; Bardgett, R. D.; Hobbs, P. J.; Kampichler, C.; Jones, T. H.
Author Affiliation:Kandler and Tscherko: Federal Agency and Research Centre for Agriculture, Vienna, Austria; and Kandler: Institute of Soil Science, Department of Soil Biology, University of Hohenheim, Stuttgart, Germany; and Bardgett: School of Biological Sciences, University of Manchester, Manchester, United Kingdom; and Hobbs: Institute of Grassland and Environmental Research, United Kingdom; and Kampichler: GSF National Research Centre for Environment and Health, Institute of Soil Ecology, Neuherberg, Germany; and Jones: NERC Centre for Population Biology, Imperial College at Silwood Park, United Kingdom.
Title:The response of soil microorganisms and roots to elevated CO₂ and temperature in a terrestrial model ecosystem
Source:Plant and Soil. Vol. 202, No. 2, May 1998, p. 251-262.
# of Pages:12
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1023/A%3A1004309623256
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Soil microorganisms; Carbon dioxide; Temperatures; Rooting; Carbon to nitrogen ratio; Ecosystems
Abstract/Contents:"We investigate the response of soil microorganisms to atmospheric CO² and temperature change within model terrestrial ecosystems in the Ecotron. The model communties consisted of four plant species (Caramine hirsuta, Poa annua, Senecio vulgaris, Spergula arvensis), four herbivorous insect species (two aphids, a leaf-miner, and a whitefly)and their parasitoids, snails, earthworms, woodlice, soil-dwelling Collembola (springtails), nematodes and soil microorganiisms (bacteria, fungi, mycorrhizae and Protista). In two successive experiments, the effects of elevated temperature (ambient plus 2°C) at both ambient and elevated CO² conditions (ambient plus 200 ppm) were investigated. A 40:60 sand:Surrey loam mixture with relatively low nutrient levels was used. Each experiment ran for 9 months and soil microbial biomass (C^D[m^D[i^D[c and N^D[m^D[i^D[c), soil microbial community (fungal and bacterial phospholipid fatty acids), basal respiration, and enzymes involved in the carbon cycling (xylanase, trehalase) were measured at depths of 0-2, 0-10 cm. In addition, root biomass and tissue C:N ratio were determined to provide information on the amount and quality of substrates for microbial growth. Elevated temperature under both ambient and elevated CO₂ did not show consistent treatment effects. Elevation of air temperature at ambient CO₂ induced an increase in C^D[m^D[i^D[c of the 0-10 cm layer, while at elevated CO₂ total phospholipids fatty acids (PLFA) increased after the third generation. The metabolic quotient qCO₂ decreased at elevated temperature in the ambient CO₂ run. Xylanase and trehalase showed no changes in both runs. Root biomass and C:N ratio were not influenced by elevated temperature inn ambient CO₂. In elevated CO₂ however, elevated temperature reduced root biomass in the 0-10 cm and 30-40 cm layers increased N content of roots in the deeper layers. The different response of root biomass and C:N ratio to elevated temperature may be caused by differences in the dynamics of root decomposition and /or in allocation patterns to coarse or fine roots (i.e. storage vs. resource capture functions). Overall, our data suggests that in soils of low nutrient availability, the effects of climate change on the soil microbial community and processes are likely to be minimal and largely unpredictable."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kandler, E., D. Tscherko, R. D. Bardgett, P. J. Hobbs, C. Kampichler, and T. H. Jones. 1998. The response of soil microorganisms and roots to elevated CO₂ and temperature in a terrestrial model ecosystem. Plant Soil. 202(2):p. 251-262.
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