Abstract
Changes in microfungal communities, fungal activities and humic substances (HS) in agricultural soils kept under different fertilization regimes were observed and their causal relationships were investigated in a long-term field experiment. Fertilization did not change the abundance of HS-utilizing microfungi and, except for organic amendment alone, total culturable microfungi were also unaffected by this factor. Organic fertilization increased activities of manganese peroxidase (MnP) and proteinase, but decreased endo-1,4-β-glucanase activity compared to the corresponding control without organic fertilization. In soils treated with mineral fertilizers, the activities of MnP, endo-1,4-β-glucanase and proteinase were higher than in control without any mineral treatment. Both the aromaticity of fulvic acid and the molar mass of humic acid was lower in soil with organic fertilization, which may be a result of oxidative degradation mediated by higher MnP activity observed in treatments with organic fertilization.
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Abbreviations
- ABTS:
-
2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)
- CFU:
-
colony forming units
- FA:
-
fulvic acid
- HA:
-
humic acid
- HS:
-
humic substances
- MEA:
-
malt extract agar
- MF:
-
mineral fertilization
- MnP:
-
manganese peroxidase
- OC:
-
oxidizable (organic) carbon
- OF:
-
organic fertilization
- SGF:
-
silica-gel supplemented with fulvic acid
- SI:
-
Sørenson index
- SOM:
-
soil organic matter
- QSI:
-
quantitative Sørenson index
- RDA:
-
redundancy analysis
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The project was funded byUniversities Development Foundation (FRVŠ, project no. 1882),Czech Science Foundation (projects no. 206/03/H137 and 526/03/0188), theFoundation Nadáni Josefa, Marie a Zdeňky Hlávkových, Institutional Research Concept no. AV0Z 50200510 andCenter of Environmental Microbiology LC06066.
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Řezáčová, V., Baldrian, P., Hršelová, H. et al. Influence of mineral and organic fertilization on soil fungi, enzyme activities and humic substances in a long-term field experiment. Folia Microbiol 52, 415–421 (2007). https://doi.org/10.1007/BF02932097
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DOI: https://doi.org/10.1007/BF02932097