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

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dc.contributor.authorMunir, Tariq
dc.contributor.authorKhadka, Bhupesh
dc.contributor.authorXu, Bin
dc.contributor.authorStrack, Maria
dc.creatorMunir, Tariq
dc.date.accessioned2017-11-22T17:12:20Z
dc.date.available2017-11-22T17:12:20Z
dc.date.issued2017-09-14
dc.description.abstractChanges 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.en_US
dc.description.grantingagencyUniversity of Calgary, Alberta Innovates, Agricultural Institute of Canada Foundationen_US
dc.description.refereedYesen_US
dc.description.sponsorshipUniversity of Calgary, Alberta Innovates, Agricultural Institute of Canada Foundationen_US
dc.identifier.citationMunir, 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.1893en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/33289
dc.identifier.urihttp://hdl.handle.net/1880/52239
dc.publisher.departmentGeographyen_US
dc.publisher.facultyArtsen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.urlhttp://onlinelibrary.wiley.com/doi/10.1002/eco.1893/fullen_US
dc.subjectbogen_US
dc.subjectC/N ratioen_US
dc.subjectclimate changeen_US
dc.subjecthydrologyen_US
dc.subjectisotopic ratioen_US
dc.subjectnutrient cyclingen_US
dc.subjectopen-top chamberen_US
dc.subjectprs probeen_US
dc.titleMineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatlanden_US
dc.typejournal article
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