Studying the impact of living roots on the decomposition of soil organic matter in two different forestry-drained peatlands
- 580 Downloads
Background and aims
Forestry drainage is the main management practice of peatlands in Finland. The influence of drainage and management on carbon (C) fluxes may vary, e.g., depending on the original peatland type. We have studied C fluxes in two forestry-drained peatlands with different nutrient status.
Our hypothesis that the differences in the C balance between these two sites can be attributed to differences in soil respiration rates, and in particular to the priming effect, was tested with laboratory microcosm flux measurements and 14C isotopic partitioning method. A two-pool mixing-model based on the natural difference in the respired 14CO2 between the peat and plants was employed.
We found no statistically significant priming effect in either nutrient-poor or nutrient-rich soil, respectively.
As no differences in priming effect were found, we can conclude that the nutrient status of the sites does not affect the priming effect in the peat soils studied here, thus our results suggest that organic soils do not support priming to the same extent as mineral soils.
KeywordsPeat soil Priming effect Radiocarbon dating SOM decomposition Microcosm Pine seedling
We gratefully acknowledge the financial support from the Maj and Tor Nessling foundation and by the European Commission through the project GHG Europe (244122). J. Pumpanen, A. Lindén and J. Heinonsalo were supported by the Academy of Finland research 130984, 218094, 255576 and 263858 as well as by the Academy of Finland Centre of Excellence Program. The study was further financially supported by the Academy of Finland research 132045 (granted to C. Biasi). We also thank Aki Tsuruta (Finnish Meteorological Institute) for valuable statistical assistance.
Compliance with ethical standards
We ensure the quality and integrity of this research. We have followed the good scientific practice as formulated in international standards for authors, developed at the 2nd World Conference on Research Integrity in Singapore in July 2010. The implementation did not require statement by an ethics committee, by the Committee on Animal Experimentation or any corresponding statement or permit. Furthermore, the research is independent and impartial and no results were published before.
- Berglund K (1996) Cultivated organic soils in Sweden: properties and amelioration. Dissertation, Department of Soil Science, Swedish Agriculture University Report 28Google Scholar
- Biasi C, Tavi NM, Jokinen S, Shurpali N, Hämäläinen K, Jungner H, Oinonen M, Martikainen PJ (2011) Differentiating sources of CO2 from organic soil under bioenergy crop cultivation: a field-based approach using 14C. Soil Biol Biochem 43:2406–2409. doi: 10.1016/j.soilbio.2011.08.00 CrossRefGoogle Scholar
- Biasi C, Pitkämäki A, Tavi N, Koponen H, Martikainen PJ (2012) An isotope approach based on 13C pulse-chase labelling vs. the root trenching method to separate heterotrophic and autotrophic respiration in cultivated peatland. Boreal Environ Res 17:184–192Google Scholar
- Dijkstra FA, Carrillo Y, Pendall E, Morgan JA (2013) Rhizosphere priming: a nutrient perspective. Front Microbiol 4. doi: 10.3389/fmicb.2013.00216
- Fry B 2006 Stable Isotope Ecology. Springer ISBN 978-0-387-30513-4Google Scholar
- Hämäläinen K, Fritze H, Jungner H, Karhu K, Oinonen M, Sonninen E, Spetz P, Tuomi M, Vanhala P, Liski J (2010) Molecular sieve sampling of CO2 from decomposition of soil organic matter for AMS radiocarbon measurements. Nucl Instrum Meth B 268:1067–1069. doi: 10.1016/j.nimb.2009.10.099 CrossRefGoogle Scholar
- Heinonsalo J, Jørgensen KS, Sen R (2001) Microcosm-based analyses of Scots pine seedling growth, ectomycorrhizal fungal community structure and bacterial carbon utilization profiles in boreal forest humus and underlying illuvial mineral horizons. FEMS Microbiol Ecol 36:73–84. doi: 10.1016/S0168-6496(01)00120-9 CrossRefPubMedGoogle Scholar
- Lindén A, Heinonsalo J, Buchmann N, Oinonen M, Sonninen E, Hilasvuori E, Pumpanen J (2014) Contrasting effects of increased carbon input on boreal SOM decomposition with and without presence of living root system of P. sylvestris L. Plant Soil 377:145–158. doi: 10.1007/s11104-013-1987-3 CrossRefGoogle Scholar
- Lohila A, Minkkinen K, Penttilä T, Launiainen S, Koskinen M, Ojanen P, Laurila T (2014) Contrasting impact of forestry-drainage on CO2 balance at two adjacent peatlands in Finland Geophysical Research Abstracts 16 (EGU2014-11392)Google Scholar
- Minkkinen K, Laine J, Shurpali NJ, Mäkiranta P, Alm J, Penttilä T (2007) Heterotrophic soil respiration in forestry-drained peatlands. Boreal Environ Res 12:115–126Google Scholar
- Pitkänen A, Turunen J, Tahvanainen T, Simola H (2013) Carbon storage change in a partially forestry-drained boreal mire determined through peat column inventories. Boreal Environ Res 18:223–234Google Scholar
- Pumpanen J, Heinonsalo J, Rasilo T, Hurme K, Ilvesniemi H (2009) Carbon balance and allocation of assimilated CO2 in Scots pine, Norway spruce, and Silver birch seedlings determined with gas exchange measurements and 14C pulse labelling in laboratory conditions. Trees - Struct Funct 23:611–621. doi: 10.2136/sssaj2007.0199 CrossRefGoogle Scholar
- Rydin H, Jeglum K (2006) The Biology of peatlands (ed. Rydin H, Jeglum K) Oxford University Press. ISBN-13: 978–0–19–852872–2Google Scholar
- Stén C-G (1998) The mires and usefulness of peat in Tammela, southern Finland (in Finnish, abstract in English). Report of peat investigation 314. Geological Survey of FinlandGoogle Scholar
- van Huissteden J, van den Bos R, Alvarez IM (2006) Modelling the effect of water-table management on CO2 and CH4 fluxes from peat soils. Neth J Geosci 851:3–18Google Scholar