期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 8, 页码 3381-3391出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b07474
关键词
Lignin-rich biorefinery byproducts; Phospholipid fatty acids (PLFAs); Soil organic matter stabilization; Offline thermochemolysis GC-MS; nuclear magnetic resonance spectroscopy
资金
- Ministry of Research of Italy (MIUR) [PON03PE_00107_01]
The development of soil microbiota and the chemical composition of soil organic matter (SOM) were studied in a 180 day incubation experiment upon addition of a characterized lignocellulosic biorefinery residue (BYP) at two different rates. The microbial growth was studied by PLFA analysis after 30, 60, and 180 days, while SOM molecular composition was assessed by thermochemolysis at the end of the trial. Soil amendments with BYP induced a well differentiated microbial community. However, the overall microbial development significantly decreased over the experimental time due to a lesser availability of decomposable C to microorganisms. The reduced C accessibility was related to the progressively higher SOM recalcitrance with increasing BYP rates and was attributed to selective accumulation into the stable SOM fraction of hydrophobic compounds which prevented further BYP mineralization by protecting BYP from microbial activity. Our findings indicate that amendments with lignin-rich residues from biorefinery processes may promote the stabilization of humified molecules in soils, thus leading to a net C accumulation in soils.
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