20150925
Author : Unger, S. Maguas, C. Pereira, J. S. David, T. S. Werner, C.
Journal : Soil Biology & Biochemistry
Comment : Two irrigation experiments were conducted on bare soil, root-free soil and intact vegetation during May and August 2005 in a semi-arid Mediterranean holm oak forest in southern Portugal. They continuously monitored CO2-fluxes along with their isotopic compositions before, during and after the irrigation. 13C signatures of the first CO2-efflux burst, occurring immediately after re-wetting, fit the hypothesis that the “Birch” pulse is caused by the rapid mineralization of either dead microbial biomass or osmoregulatory substances released by soil microorganisms in response to hypo-osmotic stress in order to avoid cell lyses.
Year : 2010
Title : The influence of precipitation pulses on soil respiration e Assessing the “Birch effect” by stable carbon isotopesJournal : Soil Biology & Biochemistry
Comment : Two irrigation experiments were conducted on bare soil, root-free soil and intact vegetation during May and August 2005 in a semi-arid Mediterranean holm oak forest in southern Portugal. They continuously monitored CO2-fluxes along with their isotopic compositions before, during and after the irrigation. 13C signatures of the first CO2-efflux burst, occurring immediately after re-wetting, fit the hypothesis that the “Birch” pulse is caused by the rapid mineralization of either dead microbial biomass or osmoregulatory substances released by soil microorganisms in response to hypo-osmotic stress in order to avoid cell lyses.
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