ISSN:
1573-5036
Keywords:
Biodegradation
;
Biomass
;
Carbon
;
Cornstalks
;
Humus formation
;
Wheat straw
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary The effect of soil type and incubation period on the biodegradation, incorporation into biomass, and stabilization in humus of14C-labeled cornstalk and/or wheat straw lignin, polysaccharide, and protein fractions were followed for one year. After 6 months, 56–68%, 6–21%, 71–81%, 63–75%, and 56–68% from wheat straw and from the lignin, polysaccharide, and protein fraction of wheat straw had been lost as CO2, respectively. Loss of CO2 increased only slightly with further incubation. Greater amounts of CO2, especially during the early incubation stages, were evolved from neutral and alkaline soils (pH 7.0, 7.4, 7.8) than from acid soils (pH 5.0, 5.5). After one year, a major portion of the residual C from lignin was recovered in the humic acid fraction, relatively small amounts, 5 to 17%, were lost upon acid hydrolysis, and generally 〈1% was found present in the biomass. Lesser amounts of the polysaccharide and protein carbons were incorporated into the humic acid, 17–20% and 16–27%, respectively. Relatively greater amounts of the residual carbons of the polysaccharide and protein were incorporated into the biomass, 4.9–7.8% and 4.6–13.4%, respectively and higher percentages were lost upon acid hydrolysis, 56 to 81%. The results for the whole wheat straw were very similar to those of the protein fraction. Overall, more residual C was stabilized into humic acid in the acid soils than in the neutral soils.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02374746
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