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Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland

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Author
Munir, Tariq
Khadka, Bhupesh
Xu, Bin
Strack, Maria
Accessioned
2017-11-22T17:12:20Z
Available
2017-11-22T17:12:20Z
Issued
2017-09-14
Subject
bog
C/N ratio
climate change
hydrology
isotopic ratio
nutrient cycling
open-top chamber
prs probe
Type
journal article
Metadata
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Abstract
Changes in atmospheric temperature and lowering in water-table (WT) are expected to affect peatland nutrient dynamics. To understand the response of peatland nitrogen (N) and phosphorus (P) dynamics to warming and drainage in a continental wooded-bog of hummock – hollow microtopography, we compared three sites: 1) control, 2) recently drained (2-3 years; experimental), and 3) older drained (12-13 years; drained), during 2013. The WT was lowered at experimental and drained sites to 74 cm and 120 cm, respectively, while a warming of ~1 °C was created at one-half of the microforms using open-top chambers. Responses of peat total-inorganic- nitrogen [TIN = nitrate nitrogen (NO3--N) + ammonium nitrogen (NH4+-N)] and phosphate-P [PO43--P] pools and, vegetation C:N ratio, δ13C, and δ15N to the experimental treatments were investigated across sites/microforms and over time. Peat TIN available and extractable pools increased with deepening of WT and over time, and were greater at hummocks relative to hollows. In contrast, the PO4 pools increased with short-term drainage but reverted to very close to their original (control) nutrient values in the longer-term. The WT and warming driven change in the peat TIN pool was strongly reflected in the vascular vegetation C:N ratio and, shrub δ13C and δ15N, while moss nutrient dynamics did not vary between sites. Therefore, we suggest that atmospheric warming combined with WT deepening can increase the availability of mineral N and P, which then can be reflected in vascular vegetation and hence modify the productivity and ecosystem functioning of the northern mid-latitude continental forested bogs in the long-term.
Grantingagency
University of Calgary, Alberta Innovates, Agricultural Institute of Canada Foundation
Refereed
Yes
Sponsorship
University of Calgary, Alberta Innovates, Agricultural Institute of Canada Foundation
Citation
Munir, T. M., Khadka, B., Xu, B., & Strack, M. Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland. Ecohydrology, n/a-n/a. doi:10.1002/eco.1893
Department
Geography
Faculty
Arts
Institution
University of Calgary
Url
http://onlinelibrary.wiley.com/doi/10.1002/eco.1893/full
Doi
http://dx.doi.org/10.11575/PRISM/33289
Uri
http://hdl.handle.net/1880/52239
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