Climate and species affect fine root production with long-term fertilization in acidic tussock tundra near Toolik Lake, Alaska


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dc.contributor.author Sullivan, Patrick F.
dc.contributor.author Sommerkorn, Martin
dc.contributor.author Rueth, Heather M.
dc.contributor.author Nadelhoffer, Knute J.
dc.contributor.author Shaver, Gaius R.
dc.contributor.author Welker, Jeffrey M.
dc.date.accessioned 2007-10-08T13:04:08Z
dc.date.available 2007-10-08T13:04:08Z
dc.date.issued 2007-04-12
dc.identifier.uri http://hdl.handle.net/1912/1812
dc.description Author Posting. © The Author(s), 2007. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Oecologia 153 (2007): 643-652, doi:10.1007/s00442-007-0753-8. en
dc.description.abstract Long-term fertilization of acidic tussock tundra has led to changes in plant species composition, increases in aboveground production and biomass and substantial losses of soil organic carbon (SOC). Root litter is an important input to SOC pools, though little is known about fine root demography in tussock tundra. In this study, we examined the response of fine root production and live standing fine root biomass to short- and long-term fertilization, as changes in fine root demography may contribute to observed declines in SOC. Live standing fine root biomass increased with long-term fertilization, while fine root production declined, reflecting replacement of the annual fine root system of Eriophorum vaginatum, with the long-lived fine roots of Betula nana. Fine root production increased in fertilized plots during an unusually warm growing season, but remained unchanged in control plots, consistent with observations that B. nana shows a positive response to climate warming. Calculations based on a few simple assumptions suggest changes in fine root demography with long-term fertilization and species replacement could account for between 20 and 39% of observed declines in SOC stocks. en
dc.description.sponsorship This project was supported by National Science Foundation research grants 9810222, 9911681, 0221606 and 0528748. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.uri http://dx.doi.org/10.1007/s00442-007-0753-8
dc.subject Betula nana en
dc.subject Eriophorum vaginatum en
dc.subject Fertilization en
dc.subject Fine roots en
dc.subject Ingrowth cores en
dc.subject Minirhizotrons en
dc.subject Soil organic carbon en
dc.subject Tussock tundra en
dc.title Climate and species affect fine root production with long-term fertilization in acidic tussock tundra near Toolik Lake, Alaska en
dc.type Preprint en

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