Carbon mineralization and microbial biomass content of wheat straw (WS), pig slurry (PS) and their mixture (WSPS), either intact or with extraction of soluble substances (-SS) or soluble substances plus hemicellulose (-SSH), added to soil, were monitored over 230 days in a laboratory incubation experiment. The WSPS showed a CO2 release of up to 23% above that predicted by summing the CO2 evolved from WS and PS. Of the several kinetic models tested to describe the mineralization process, a double exponential model best described the C mineralization of all the materials, both intact and with extractions. The extraction of the labile substances from WS, PS and WSPS lowered the values of the rapidly mineralizable C and of the amount of microbial biomass. The organic fraction of WS was found to be almost completely represented by mineralizable carbon, while PS and WSPS showed only 62% of mineralizable carbon. In spite of this, after 8 months, about half of the initial amount of the organic C in the intact residues still remained unmineralized.
|Autori:||Saviozzi A.; Levi_Minzi R.; Riffaldi R.; Vanni G.|
|Titolo:||Role of chemical constituents of wheat straw and pig slurry on their decomposition in soil|
|Anno del prodotto:||1997|
|Digital Object Identifier (DOI):||10.1007/s003740050332|
|Appare nelle tipologie:||1.1 Articolo in rivista|