Abstract
Background & aims
Herbivore-driven changes to soil properties can influence the decomposition rate of organic material and therefore soil carbon cycling within grassland ecosystems. We investigated how aboveground foraging mammalian and invertebrate herbivores affect mineral soil decomposition rates and associated soil properties in two subalpine vegetation types (short-grass and tall-grass) with different grazing histories.
Methods
Using exclosures with differing mesh sizes, we progressively excluded large, medium and small mammals and invertebrates from the two vegetation types in the Swiss National Park (SNP). Mineral soil decomposition rates were assessed using the cotton cloth (standard substrate) method between May and September 2010.
Results
Decomposition displayed strong spatio-temporal variability, best explained by soil temperature. Exclusion of large mammals increased decomposition rates, but further exclusion reduced decomposition rates again in the lightly grazed (tall-grass) vegetation. No difference among treatments was found in the heavily grazed (short-grass) vegetation. Heavily grazed areas had higher decomposition rates than the lightly grazed areas because of higher soil temperatures. Microbial biomass carbon and soil C:N ratio were also linked to spatio-temporal decomposition patterns, but not to grazing history.
Conclusions
Despite altering some of the environmental controls of decomposition, cellulose decomposition rates in the SNP’s subalpine grasslands appear to be mostly resistant to short-term herbivore exclusion.
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Abbreviations
- SNP:
-
Swiss National Park
- C:
-
Carbon
- N:
-
Nitrogen
- P:
-
Phosphorus
- OM:
-
Organic matter
- MBC:
-
Microbial biomass carbon
- PCA:
-
Principal component analysis
- PC:
-
Principal component
- PWP:
-
Permanent wilting point
- CTSL:
-
Cotton tensile strength loss
- CRR:
-
Cotton rotting rate
- q mic :
-
Microbial quotient (microbial C:soil C)
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Acknowledgments
We would like to thank the employees and volunteers of the Swiss Federal Institute for Forest, Snow and Landscape Research and the Swiss National Park for assistance with fence construction, data collection and lab analyses. Special thanks go to Anna Schweiger for assistance preparing the cloths. We are also grateful to the SNP for administrative support throughout our research, as well as Douglas A. Frank and three anonymous reviewers for constructive comments on previous versions of the manuscript. This study was funded by the Swiss National Science Foundation, SNF grant-no 31003A_122009/1, to ACR, MS and Flurin Filli (SNP).
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Haynes, A.G., Schütz, M., Buchmann, N. et al. Linkages between grazing history and herbivore exclusion on decomposition rates in mineral soils of subalpine grasslands. Plant Soil 374, 579–591 (2014). https://doi.org/10.1007/s11104-013-1905-8
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DOI: https://doi.org/10.1007/s11104-013-1905-8