Identifying nitrogen limitations to organic sediments accumulation in various vegetation types of arctic tundra (Hornsund, Svalbard)

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dc.contributor.authorSkrzypek, Gen_AU
dc.contributor.authorWojtuń, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorRichter, Ren_AU
dc.contributor.authorJakubas, Den_AU
dc.contributor.authorWojczulanis–Jakubas, Ken_AU
dc.contributor.authorSamecka–Cymerman, Aen_AU
dc.date.accessioned2016-04-20T02:12:31Zen_AU
dc.date.available2016-04-20T02:12:31Zen_AU
dc.date.issued2015-12-15en_AU
dc.date.statistics2016-04-20en_AU
dc.description.abstractArctic and subarctic regions play important roles in the global carbon balance. However, nitrogen (N) deficiency is a major constraint for organic carbon sequestration in the High Arctic. Hence, the identification of the relative contributions from different N-sources is critical for understanding the constraints that limit tundra growth. The stable nitrogen composition of the three main N-sources and numerous plants were analyzed in ten tundra types in the Fuglebekken catchment (Hornsund Fjord, Svalbard, 77°N 15°E). The percentage of the total tundra N-pool provided by seabirds’ feces (colonially breeding, planktivorous Alle alle), ranged from 0–21% in Patterned-ground tundra to 100% in Ornithocoprophilous tundra. The total N-pool utilized by tundra plants in the studied catchment was built in 36% by birds, 38% by atmospheric deposition, and 26% by N2-fixation. The results clearly show that N-pool in the tundra is significantly supplemented by nesting seabirds. Thus, if they experienced substantial negative environmental pressure associated with climate change, it would adversely influence the tundra N-budget [1]. The growth rates and the sediment thickness (<15 cm) in different tundra types varied considerably but the tundra age was similar, <450 cal BP. The only exception was Ornithocoprophilous tundra with very diverse ages ranging from 235 to 2300 cal BP and thickness up to 110cm. The growth rates for this tundra (62 cm core, 18 AMS 14C dates) were high (1.5-3.0 mm/yr) between 1568 and 1804 AD and then substantially declined for the period between 1804 and 1929 AD (0.2 mm/yr). These findings deliver an additional argument, that the organic matter accumulation is driven not only directly by climatic conditions but also by birds’ contribution to the tundra N-pool. © 2014, American Geophysical Union.en_AU
dc.identifier.citationSkrzypek, G., Wojtuń, B., Hua, Q., Richter, R., Jakubas, D., Wojczulanis–Jakubas, K., & Samecka–Cymerman, A. (2015). Identifying nitrogen limitations to organic sediments accumulation in various vegetation types of arctic tundra (Hornsund, Svalbard). Paper presented at the AGU Fall Meeting San Francisco, 14-18 December 2015.en_AU
dc.identifier.conferenceenddate18 December 2015en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceSan Francisco, Californiaen_AU
dc.identifier.conferencestartdate14 December 2015en_AU
dc.identifier.govdoc6422en_AU
dc.identifier.issnB31C-0560en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm15/webprogram/Paper78559.htmlen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6778en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectSedimentsen_AU
dc.subjectPlantsen_AU
dc.subjectTundraen_AU
dc.subjectNitrogenen_AU
dc.subjectClimatesen_AU
dc.subjectBirdsen_AU
dc.titleIdentifying nitrogen limitations to organic sediments accumulation in various vegetation types of arctic tundra (Hornsund, Svalbard)en_AU
dc.typeConference Abstracten_AU
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