| Title: |
Black spruce needle nitrogen concentration from 5 stands in 1999
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| Contacts: |
McGuire, A.
Clein, Joy
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| Abstract: |
We collected black spruce needle from several sites located near Fairbanks Ak, and Delta, Ak in August 1999 (Sites designated here as S1, S2, and S3) were located in Fairbanks (64o40?N, 148o15?W), Alaska (S1: 64o52.164? N, 147o51.462? W; S2: 64o52.058? N, 147o51.378? W; S3: 64o51.603? N, 147o52.789? W) with 2 additional sites (S4, S5) in Delta, Alaska (64010? N, 145030? W).
In each stand, 30 trees were randomly selected for sampling. Within each tree, five shoots were collected from the southern aspect of the mid-canopy height from each of the following age classes: 0-, 1-, 4-, 9-, and 19-years old. In two of the Fairbanks stands (S2, S3), 19-year old needles were not present. A total of 690 samples over the five stands include 150 samples per stand in three stands (S1, S4, S5) and 120 samples per stand in the other two stands (S2, S3). Needles were returned to the lab and nitrogen content was determined.
We used a three-factor nested analysis of variance (ANOVA) to evaluate differences in needle N concentration among the ages of needles on a tree, among trees nested within a stand, and among stands. Ages and stands were treated as fixed factors and tree was treated as a random factor. The ANOVA and means testing for these differences used Proc GLM in the SAS statistical package with needle N content as the dependent variable and needle age, tree, and stand as independent variables. The GLM procedure handled the problem of missing treatment combinations within the ANOVA. Type III sum of squares was used to test the effects of factors without interactions
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| Keywords: |
black spruce, Fairbanks, nitrogen, |
| Categories: |
Biogeochemistry
Vegetation
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| Study Period: |
Jun 1, 1999 to Sep 1, 1999
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| Bounding Box: |
West longitude: -147.8798°
North latitude: 64.8694°
East longitude: -145.5°
South latitude: 64.1667°
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| Site References: |
S1 --
S2 --
S3 --
S4 --
S5 --
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| Data Columns: |
| Column |
Name |
Units |
Type |
| 1 |
Stand |
|
integer |
| 2 |
needleage |
|
integer |
| 3 |
Tree# |
|
integer |
| 4 |
N(%) |
|
float |
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| Data File(s): |
5standsN.txt
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| Supplemental Files: |
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| Metadata Formats: |
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| Public Release: |
Jan 1, 2007
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| Publications: |
Zhang, X., A.D. McGuire, and R.W. Ruess. 2006. Scaling uncertainties in estimating canopy foliar maintenance respiration for black spruce ecosystems in Alaska. Mitigation and Adaptation Strategies for Global Change,Volume 11(1):147-171, DOI: 10.107/s11027-006-1015-5.
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The Bonanza Creek LTER, including this website, is supported by the
National Science Foundation through awards
DEB-0620579,
DEB-0423442,
DEB-0080609,
DEB-9810217,
DEB-9211769,
DEB-8702629
and by the USDA Forest Service, Pacific Northwest Research Station through agreement number RJVA-PNW-01-JV-11261952-231.
Any opinions, findings, conclusions, or recommendations expressed in the
material are those of the author(s) and do not necessarily reflect
the views of the supporting agencies or the program as a whole.
© Bonanza Creek LTER, 2009.
Last modified 22-Nov-09
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