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Short-Term and Long-Term Effects of Natural and Artificial Carbonaceous Substrates on Greenhouse Gas Fluxes

Journal of Renewable Materials 2022年第7期10卷 1773-1786页

作者： Jürgen Kern Judy Libra christian ammon York Neubauer Wenceslau Teixeira Leibniz Institute for Agricultural Engineering and Bioeconomy e.V.(ATB) Potsdam14469Germany TCKON Engineering Services Dr.-Ing.York Neubauer Berlin13088Germany Embrapa Soils Rio de Janeiro24600-000Brazil

The emissions of two greenhouse gases(GHG),carbon dioxide(CO_(2))and nitrous oxide(N2O),from six substrates with different carbonaceous content were compared in short and long-term incubation *** natural soils and three artificial chars were mixed with carbon(C)poor soil(Cambisol)to simulate real conditions after application of char to *** natural soils were a Cambisol,an Anthrosol and a Histosol with C contents of 1.3%,4.4%and 13.2%,*** three chars produced through thermal conversion of wood chips by hydrothermal carbonisation(HTC),fluidized bed gasification and pyrolysis had C contents of 56.9%,75.4%and 79.9%,*** rates of CO_(2)and N2O from the rewetted substrates were measured by gas chromatography over a short time of 72 h and over a long period of nearly two *** short-term CO_(2)emissions from the natural soils showed a clear relationship to their C *** emission rate for the Histosol/Cambisol mixture was three times higher than that for the pure Cambisol,77.1 vs.23.5 mg CO_(2)-C kg^(-1)organic matter(OM)per *** C emission rates for the char/Cambisol mixtures were much lower,ranging between 3.0 and 9.1 mg CO_(2)-C kg OM^(-1)h^(-1),and did not correspond to their total C *** between the two incubation lengths showed that the long-term CO_(2)emission rates were generally one order of magnitude lower than the short-term *** final emission rates for natural substrates over a period of two years were still twice those for artificial char substrates,between 2.2–3.5 mg CO_(2)-C kg OM^(-1)h^(-1)and 1.3–1.8 mg CO_(2)-C kg OM^(-1)h^(-1),*** the contents of total nitrogen(Ntot)and extractable nitrogen(Nmin)were considerable in the chars under study,enhanced N2O release was not observed in the incubation ***,N2O emission rates in the three mixtures of chars and Cambisol were lower by one to two orders of magnitude compared to the pure Cambisol in

关键词： Biochar HTC char incubation experiment GHG carbon stability

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