Abstract
Aims
We analysed current carbon (C) stocks in fine root and aboveground biomass of riparian forests and influential environmental parameters on either side of a dike in the Donau-Auen National Park, Austria.
Methods
On both sides of the dike, carbon (C) stock of fine roots (CFR) under four dominant tree species and of aboveground biomass (CAB) were assessed by topsoil cores (0–30 cm) and angle count sampling method respectively (n = 48). C stocks were modeled, performing boosted regression trees (BRT).
Results
Overall CFR was 2.8 t ha−1, with significantly higher C stocks in diked (DRF) compared to flooded riparian forests (FRF). In contrast to CFR, mean CAB was 123 t ha−1 and lower in DRF compared to FRF. However, dike construction was consistently ruled out as a predictor variable in BRT. CFR was influenced by the distance to the Danube River and the dominant tree species. CAB was mainly influenced by the magnitude of fluctuations in the groundwater table and the distances to the river and the low groundwater table.
Conclusions
Despite pronounced differences in FRF and DRF, we conclude that there is only weak support that dikes directly influence C allocation in floodplain forests within the time scale considered (110 years).
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Abbreviations
- BRT:
-
Boosted regression trees
- C:
-
Carbon
- CFR:
-
C stock of fine root biomass
- CAB:
-
C stock of aboveground biomass
- DBH:
-
Diameter at breast height
- DRF:
-
Diked riparian forest
- FRF:
-
Flooded riparian forest
- NPP:
-
Net primary production
- SE:
-
Standard error
- TRF:
-
Total riparian forest
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Acknowledgments
This study was carried out as a part of the project “Carbon dynamics in soils and vegetation of riparian forests” funded by the Deutsche Forschungsgemeinschaft (DFG, grant number CI 175/1). We thank Torben Lübbe for helping with the field and laboratory work. We also thank Christian Fraissl and Christian Baumgartner (Donau-Auen National Park administration), Alfred Paul Blaschke from the TU Vienna for providing a groundwater model, the via donau – Österreichische Wasserstraßen-Gesellschaft mbH for providing the digital elevation model, Jörg Luster (Swiss Federal Institute for Forest, Snow and Landscape Research) for the pre-submission review and Kelaine Vargas for improving our English. Two anonymous reviewers helped to improve a former version of the manuscript.
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Rieger, I., Lang, F., Kleinschmit, B. et al. Fine root and aboveground carbon stocks in riparian forests: the roles of diking and environmental gradients. Plant Soil 370, 497–509 (2013). https://doi.org/10.1007/s11104-013-1638-8
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DOI: https://doi.org/10.1007/s11104-013-1638-8