The nitrogen budget of a hybrid poplar plantation in Minnesota

K. L. Updegraff, D. R. Zak, D. F. Grigal

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Total aboveground tree biomass represented only 1.6% of the total N capital. Stable soil inorganic N was the largest pool, 5670 kg N.ha-1, and constituted 93% of all N within the site. Labile soil inorganic N and microbial N represented 5.6 and 1.6% of stable soil organic N, respectively. Nitrogen mineralization averaged 56 kg N.ha-1.yr-1, and 66% of that production was oxidized to NO3 -. Losses of N by denitrification and leaching were small compared with the magnitude of the other fluxes. A relatively high rate of plant uptake and production maintained NH4 + and NO3 - pools at low levels, minimizing N exports to the atmosphere and groundwater. -from Authors

Original languageEnglish (US)
Pages (from-to)1818-1822
Number of pages5
JournalCanadian Journal of Forest Research
Issue number11
StatePublished - Jan 1 1990


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