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• W2550964418 abstract "To estimate CO2 sink capacity of soils, balances be­ tween carbon (C) inputs and outputs are necessary. Total CO2 efflux from unplanted soil represents the losses of soil organic matter (SOM). Estimation of SOM losses by means of total CO2 efflux from planted soil is difficult because CO2 efflux from planted soil consists from four main sources and processes: (1) Root respiration, (2) Microbial decomposition of exudates, sloughed root cells and other rhizodeposits, (3) Microbial decomposition of dead plant de­ bris, and (4) Microbial SOM decomposition. The ratio between these sources varies strongly be­ tween agricultural plants, their development stage, as well as soil management practice. These four sources differently contribute to the atmospheric CO2 concen­ tration. Two first sources (root-derived CO2) repre­ sent a short circuit of plant-assimilated C in the atmosphere-plant-soil cycle. Therefore, the root-derived CO2 they do not contribute to the change of atmos­ pheric CO2. The third source: microbial decomposi­ tion of dead plant debris of previous crop – represents the CO2 efflux from the short-time storage of assimi­ lated C and therefore its contribution to the change of atmospheric CO2 is marginal. The last CO2 source: microbial SOM decomposition is the major terrestrial process that affects the atmospheric CO2, mainly ini­ tiated by land use changes, tillage practices, defores­ tation, etc. The methods used for separation and independent es­ timation of C from each source of CO2 efflux from non-sterile soil under field and laboratory conditions are reviewed. The principles, advantages and short­ comings of isotopic and traditional methods are shortly presented. The separation of the root-derived CO2 in root respiration per se and rhizomicrobial res­ piration by four methods in one experiment is pre­ sented and evaluated according to results obtained, as well as their applicability and practicability." @default.
• W2550964418 created "2016-11-30" @default.
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• W2550964418 date "2005-01-01" @default.
• W2550964418 modified "2023-09-24" @default.
• W2550964418 title "Biologische Senken für atmosphärischen Kohlenstoff in Deutschland - Tagungsband" @default.
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