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• W2027202210 abstract "Abstract Microbial responses to three years of CO 2 enrichment (600 μL L –1 ) in the field were investigated in calcareous grassland. Microbial biomass carbon (C) and soil organic C and nitrogen (N) were not significantly influenced by elevated CO 2 . Microbial C:N ratios significantly decreased under elevated CO 2 (– 15%, P = 0.01) and microbial N increased by + 18% ( P = 0.04). Soil basal respiration was significantly increased on one out of 7 sampling dates (+ 14%, P = 0.03; December of the third year of treatment), whereas the metabolic quotient for CO 2 (qCO 2 = basal respiration/microbial C) did not exhibit any significant differences between CO 2 treatments. Also no responses of microbial activity and biomass were found in a complementary greenhouse study where intact grassland turfs taken from the field site were factorially treated with elevated CO 2 and phosphorus (P) fertilizer (1 g P m –2 y –1 ). Previously reported C balance calculations showed that in the ecosystem investigated growing season soil C inputs were strongly enhanced under elevated CO 2 . It is hypothesized that the absence of microbial responses to these enhanced soil C fluxes originated from mineral nutrient limitations of microbial processes. Laboratory incubations showed that short‐term microbial growth (one week) was strongly limited by N availability, whereas P was not limiting in this soil. The absence of large effects of elevated CO 2 on microbial activity or biomass in such nutrient‐poor natural ecosystems is in marked contrast to previously published large and short‐term microbial responses to CO 2 enrichment which were found in fertilized or disturbed systems. It is speculated that the absence of such responses in undisturbed natural ecosystems in which mineral nutrient cycles have equilibrated over longer periods of time is caused by mineral nutrient limitations which are ineffective in disturbed or fertilized systems and that therefore microbial responses to elevated CO 2 must be studied in natural, undisturbed systems." @default.
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• W2027202210 date "1998-04-01" @default.
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• W2027202210 title "Effects of elevated atmospheric CO₂ on soil microbiota in calcareous grassland" @default.
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• W2027202210 doi "https://doi.org/10.1046/j.1365-2486.1998.00166.x" @default.
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