uid=BNZ,o=lter,dc=ecoinformatics,dc=org all public read knb-lter-bnz.228.10 A. David McGuire Co-PI

Alaska Cooperative Fish and Wildlife Research Unit University of Alaska Fairbanks Irving I Building Fairbanks AK 99775 United States

(907) 474-6242 (907) 474-7872 admcguire@alaska.edu http://mercury.bio.uaf.edu/~dave_mcguire/dmcguire.html Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 jpdowning@alaska.edu http://www.lter.uaf.edu Joy S Clein Research Professional

Institute of Arctic Biology University of Alaska Fairbanks P.O. Box 757000 Fairbanks AK 99775-7000 United States

(907) 474-5660 (907) 474-6967 Associated investigator 2007-01-01 We collected black spruce needle from one site located near Fairbanks Ak (S1: 64o52.164? N, 147o51.462? W) in August 1998. The needles were collected from 10 different trees, 5 leafage classes, 3 layers, 2 aspectss, and 3 replicates of each. Nitrogen concentration was measured on these needles. Data analysis indicated that canopy aspect and height did not significantly influence needle concentration, but needle age (F = 555, P < 0.0001) and individual trees within a stand (F = 108, P < 0.0001) combined to explain over 90% of the variation in foliar N.> black spruce Fairbanks nitrogen Biogeochemistry

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http://www.lter.uaf.edu/data_detail.cfm?datafile_pkey=228 1998-06-01 1998-09-01

Completed

Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 jpdowning@alaska.edu http://www.lter.uaf.edu Bonanza Creek LTER

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 Bonanza Creek LTER

Collected 3 replicates of needles The factors evaluated included trees (ten trees), height (three levels in the canopy), aspect (north vs. south), branches (three branches for each tree-height-aspect combination) and needle age (ages 0, 1, 4, 9, and 19 on each branch). Samples were oven dried at 50 oC for three to five days, and needles were removed from shoots, weighed, ground through a 20 µm mesh screen, and analyzed for total N on a LECO 2000 CNS Autoanalyzer (St. Joseph, Michigan).

intTreesN.txt intTreesN.txt 1 \n \n column , http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-bnz..&urlTail=/ascii/files/intTreesN.txt tree# tree# tree# integer tree# leafage leafage leafage integer leafage layer layer layer string layer replicate replicate replicate integer replicate direction direction direction string direction N(%) N(%) N(%) float dimensionless real