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Experimental nitrogen, phosphorus, and potassium deposition decreases summer soil temperatures, water contents, and soil CO2 concentrations in a northern bog

Title data

Wendel, Sybille ; Moore, Tim R. ; Bubier, Jill ; Blodau, Christian:
Experimental nitrogen, phosphorus, and potassium deposition decreases summer soil temperatures, water contents, and soil CO2 concentrations in a northern bog.
In: Biogeosciences. Vol. 8 (2011) . - pp. 585-595.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-8-585-2011

Abstract in another language

Ombrotrophic peatlands depend on airborne nitrogen (N), whose deposition has in-creased in the past and lead to disappearance of mosses and increased shrub biomass in fertilization experiments. The response of soil water content, temperature, and carbon gas concentrations to increased nutrient loading is poorly known and we thus determined these data at the long-term N fertilization site Mer Bleue bog, Ontario, during a two month period in summer. Soil temperatures decreased with NPK addition in shallow peat soil primarily during the daytime (t-test, p<0.05) owing to increased shading, whereas they increased in deeper peat soil (t-test, p<0.05), probably by enhanced thermal conduc-tivity. These effects were confirmed by RMANOVA, which also suggested an influence of volumetric water contents as co-variable on soil temperature and vice versa (p<0.05). Averaged over all fertilized treatments, the mean soil temperatures at 5 cm depth de-creased by 1.3°C and by 4.7 °C (standard deviation 0.9 °C) at noon. Water content was most strongly affected by within-plot spatial heterogeneity but also responded to both N and PK load according to RMANOVA (p<0.05). Overall, water content and CO2 concen-trations in the near-surface peat (t-test, p<0.05) were lower with increasing N load, sug-gesting more rapid soil gas exchange. The results thus suggest that changes in bog eco-system structure with N deposition have significant ramifications for physical parameters that in turn control biogeochemical processes.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER92579
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 15 May 2015 14:47
Last Modified: 11 Jun 2015 13:05
URI: https://eref.uni-bayreuth.de/id/eprint/13676