Residue fractionation and decomposition: the significance of the active fraction
This paper describes an incubation experiment with homogeneously 14C labeled maize-straw and its insoluble fraction. The role of the soluble fraction in the decomposition process was assessed, using three independently measured characteristics: (1) fractionation of the maize-straw, resulting in kine...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1994
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| Acceso en línea: | https://hdl.handle.net/10568/100901 |
| _version_ | 1855525522051694592 |
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| author | Vanlauwe, Bernard Dendooven, Luc Merckx, Roel |
| author_browse | Dendooven, Luc Merckx, Roel Vanlauwe, Bernard |
| author_facet | Vanlauwe, Bernard Dendooven, Luc Merckx, Roel |
| author_sort | Vanlauwe, Bernard |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | This paper describes an incubation experiment with homogeneously 14C labeled maize-straw and its insoluble fraction. The role of the soluble fraction in the decomposition process was assessed, using three independently measured characteristics: (1) fractionation of the maize-straw, resulting in kinetically different fractions; (2) microbial biomass C and its 14C activity determined by a fumigation extraction method, and (3) the 14C activity of the released CO2-C. The fumigation extraction method was proved to be useful from 9 days after the application of the maize-straw onwards. The fractionation method yielded a soluble (48%), a (hemi) cellulosic (47%), and a lignin fraction (1%). Nine days after addition of either the complete residue or its insoluble fraction, the microbial biomass C increased from 53 to 337 and 217 mg C kg-1 dry soil, respectively. Similar values were maintained up to day 40. The large increase in microbial activity was accompanied by a N-immobilization of 65 and 29 mg N Kg-1 dry soil for the maize-straw treatment and its insoluble fraction, respectively, resulting in biomass C/N values of 5.5 and 5.6 A genuine priming effect (10 and 7% of the total CO2-C production) on the mineralization of native soil organic C was caused by an increase in decomposition of the native C rather than by an increase in turnover of the microbial biomass in the soil amended with maize straw. The soluble fraction caused a 'priming effect' on the decomposition of the less decomposable cell-wall fraction. Calculations by nonlinear regression confirmed this observation. |
| format | Journal Article |
| id | CGSpace100901 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1994 |
| publishDateRange | 1994 |
| publishDateSort | 1994 |
| record_format | dspace |
| spelling | CGSpace1009012024-03-10T07:22:34Z Residue fractionation and decomposition: the significance of the active fraction Vanlauwe, Bernard Dendooven, Luc Merckx, Roel maize yields decomposition soil This paper describes an incubation experiment with homogeneously 14C labeled maize-straw and its insoluble fraction. The role of the soluble fraction in the decomposition process was assessed, using three independently measured characteristics: (1) fractionation of the maize-straw, resulting in kinetically different fractions; (2) microbial biomass C and its 14C activity determined by a fumigation extraction method, and (3) the 14C activity of the released CO2-C. The fumigation extraction method was proved to be useful from 9 days after the application of the maize-straw onwards. The fractionation method yielded a soluble (48%), a (hemi) cellulosic (47%), and a lignin fraction (1%). Nine days after addition of either the complete residue or its insoluble fraction, the microbial biomass C increased from 53 to 337 and 217 mg C kg-1 dry soil, respectively. Similar values were maintained up to day 40. The large increase in microbial activity was accompanied by a N-immobilization of 65 and 29 mg N Kg-1 dry soil for the maize-straw treatment and its insoluble fraction, respectively, resulting in biomass C/N values of 5.5 and 5.6 A genuine priming effect (10 and 7% of the total CO2-C production) on the mineralization of native soil organic C was caused by an increase in decomposition of the native C rather than by an increase in turnover of the microbial biomass in the soil amended with maize straw. The soluble fraction caused a 'priming effect' on the decomposition of the less decomposable cell-wall fraction. Calculations by nonlinear regression confirmed this observation. 1994 2019-04-24T12:29:33Z 2019-04-24T12:29:33Z Journal Article https://hdl.handle.net/10568/100901 en Limited Access Vanlauwe, B., Dendooven, L. & Merckx, R. (1994). Residue fractionation and decomposition: the significance of the active fraction. Plant and Soil, 158, 263-274. |
| spellingShingle | maize yields decomposition soil Vanlauwe, Bernard Dendooven, Luc Merckx, Roel Residue fractionation and decomposition: the significance of the active fraction |
| title | Residue fractionation and decomposition: the significance of the active fraction |
| title_full | Residue fractionation and decomposition: the significance of the active fraction |
| title_fullStr | Residue fractionation and decomposition: the significance of the active fraction |
| title_full_unstemmed | Residue fractionation and decomposition: the significance of the active fraction |
| title_short | Residue fractionation and decomposition: the significance of the active fraction |
| title_sort | residue fractionation and decomposition the significance of the active fraction |
| topic | maize yields decomposition soil |
| url | https://hdl.handle.net/10568/100901 |
| work_keys_str_mv | AT vanlauwebernard residuefractionationanddecompositionthesignificanceoftheactivefraction AT dendoovenluc residuefractionationanddecompositionthesignificanceoftheactivefraction AT merckxroel residuefractionationanddecompositionthesignificanceoftheactivefraction |