Decomposition of lignin in soil microcompartments: A methodical study with three different C-14-labelled lignin substrates
| ISSN: |
1432-0789
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| Keywords: |
Lignin decomposition ; Soil microcompartments ; White-rotted wood ; Brown-rotted wood ; Earthworm faeces ; Octolasion lacteum ; Fagus sylvatica
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Biology
Geosciences
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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| Notes: |
Summary C mineralization of three different C-14-labelled lignin substrates (Klason-lignin, dioxane-lignin, lignocellulose) was investigated in four microcompartments, consisting of white-rotted beechwood (Fagus sylvatica L)., brown-rotted beechwood, earthworm [Octolasion lacteum (Örley)] faecal particles mixed with white-rotted beechwood, and earthworm feacal particles mixed with brown-rotted beechwood, incubated at 10°C for 193 days. Conversion of the labelled substrates to 14CO2 was low in both white-rotted and brown-rotted wood without faecal particles. Overall C mineralization followed the order Klason-lignin 〉 dioxane-lignin 〉 lignocellulose, indicating that there were different amounts of labelled contaminants in the lignin substrates. Lignin degradation was more pronounced in earthworm faeces mixed with wood materials, and overall C mineralization ranged between 4.4% and 6.3% of the inital C content. C mineralization of the lignin substrates increased considerably in faecal particles after about 90 days, presumably due to nutrient immobilization and microbial succession. The usefulness of the three lignin substrates in monitoring the time-course and extent of lignin degradation in soil microcompartments is discussed.
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| Type of Medium: |
Electronic Resource
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| URL: |