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| Titel |
Crop residue decomposition in Minnesota biochar-amended plots |
| VerfasserIn |
S. L. Weyers, K. A. Spokas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-06-11), S.499-507 |
| Datensatznummer |
250115282
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| Publikation (Nr.) |
 copernicus.org/se-5-499-2014.pdf |
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| Zusammenfassung |
| Impacts of biochar application at laboratory scales are routinely studied,
but impacts of biochar application on decomposition of crop residues at field
scales have not been widely addressed. The priming or hindrance of crop
residue decomposition could have a cascading impact on soil processes,
particularly those influencing nutrient availability. Our objectives were to
evaluate biochar effects on field decomposition of crop residue, using plots
that were amended with biochars made from different plant-based feedstocks
and pyrolysis platforms in the fall of 2008. Litterbags containing wheat
straw material were buried in July of 2011 below the soil surface in a
continuous-corn cropped field in plots that had received one of seven
different biochar amendments or a uncharred wood-pellet amendment 2.5 yr
prior to start of this study. Litterbags were collected over the course of
14 weeks. Microbial biomass was assessed in treatment plots the previous
fall. Though first-order decomposition rate constants were positively
correlated to microbial biomass, neither parameter was statistically affected
by biochar or wood-pellet treatments. The findings indicated only a residual
of potentially positive and negative initial impacts of biochars on residue
decomposition, which fit in line with established feedstock and pyrolysis
influences. Overall, these findings indicate that no significant alteration
in the microbial dynamics of the soil decomposer communities occurred as a
consequence of the application of plant-based biochars evaluated here. |
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