Hubbard Brook Experimental Forest Watershed 1 Temporal Canopy Leaf Chemistry, 1999 - 2002
TITLE
Hubbard Brook Experimental Forest Watershed 1 Temporal Canopy Leaf Chemistry, 1999 - 2002
PRINCIPAL INVESTIGATOR(s)
Tim Fahey
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
OTHERS INVOLVED
Ian Halm
U.S. Forest Service, Hubbard Brook Experimental Forest
234 Mirror Lake Road
North Woodstock, NH 03262
USA
Suzanne Wapner
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Cynthia Wood
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Ellen Denny
National Phenology Network
Linda Pardo
USDA Forest Service
705 Spear Street
South Burlington, VT 05403
USA
Thomas Siccama
Yale School of Forestry and Environmental Studies
ABSTRACT:
Overstory foliage is collected in late summer from calcium-treated forest on watershed 1. Nutrient concentrations in foliage are measured. This allows us to estimate the pool of nutrients in foliage in combination with litterfall estimates of foliage biomass. We can compare foliar chemistry in W1 with that in W6 to quantify calcium treatment effects. Long-term measurements continue with the aim of detecting trends in foliage chemistry over long time scales.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
canopy, carbon, cation, chemistry, foliage, forest, HBEF Watershed 1, HBR, Hubbard Brook LTER, leaves, nitrogen, tree, watershed.
KEYWORD SET: LTER Core Research Areas
inorganic nutrients.
BEGIN DATE
1999
END DATE
2002
LOCATION
The coniferous forest at the top of Watershed 1 (within the watershed boundaries and thus within the calcium addition) at an elevation of about 730 m. The coordinates given below correspond to the whole of watershed 1.
West bounding coordinate: -71.730866
East bounding coordinate: -71.725832
North bounding coordinate: 43.959356
South bounding coordinate: 43.952121
Elevation
Minimum: 730
Maximum: 730
(Unit: meter)
FIELD PROCEDURES
The samples were collected by climbing the trees and taking leaves from the upper canopy for each species and elevation. Samples were obtained from one tree. Sampled trees are not consistent from year to year.
Collections were initiated in 1999, repeated annually through 2002 and continue annually. Note that the 1999 samples were taken before the calcium addition in October 1999. See the following link for more spatial information about the collection site:
http://www.hubbardbrook.org/research/gallery/maps/HBEF_Map.gif
LABORATORY PROCEDURES
Following collection, leaf samples are oven dried at 60-70 degrees Celsius until thoroughly dry. Samples are then ground in an electric coffee/spice mill, and stored in glass vials or 4 oz. jars. Samples are dried again in jars with caps loosened for 24 hours at 80 degrees Celsius before chemical analysis. For determination of organic content and chemical analysis, a 0.3 g sample of the oven dry ground material was placed in a pre-weighed crucible and ashed overnight at 450-500 degrees C. The ashed material was cooled and weighed. The ash was eluted with 10 ml of 6N HNO3 and heated for a few minutes (to a simmer) on a hot plate. The hot extract solution was poured filtered (Whatmann # 41 ashless) in a funnel and into a 50 ml volumetric flask. The crucible and the material on the filter paper were rinsed several times with distilled deionized water. Following these several rinsings, the volume in the flask was brought up to 50 ml with the distilled deionized water. The 50 ml of extract solution was then placed in 60 ml plastic bottles for storage until chemical analysis. The elements Ca, Mg, K, P, and Mn were determined for each sample using an ICP spectrometer.
CALCULATIONS
Data is presented as elemental concentrations on a dry weight basis.
DATA ACCESS GUIDELINES
Data Use Policy



The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, government or other not-for-profit professional purposes.

2) Redistribution. The data and metadata are provided for use by the Data User. The Data User will not redistribute the original Data Set or metadata to others without the explicit permission of the Principal Investigator.

3) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly attribute the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier.

Citation example: Holmes, R.T. 2012. Bird Abundances at Hubbard Brook (1969-2010) and on three replicate plots (1986-2000) in the White Mountain National Forest. Durham, NH. Hubbard Brook Data Archive [Database]. http://hubbardbrook.org/data/dataset.php?id=81 (23 July 2012)

4) Acknowledgment: The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed to its content. Acknowledgments should identify the supporting party, the party that received the support, and any identifying information such as grant numbers.

Acknowledgment example: Data on [topic] were provided by [name of PI] on [date]. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station, Newtown Square, PA. Significant funding for collection of these data was provided by [agency]-[grant number], [agency]-[grant number], etc.

5) Consultation and questions. Data users are strongly encouraged to consult with the Principal Investigator(s) who collected these data for further information. Also, when appropriate, Data Users should consider including the Principal Investigator as a collaborator and/or co-author in the use of these data.

6) Notification. The Data User will notify the Principal Investigator of any publication or derivative work based on the Data Set. The Data User will also provide the Principal Investigator and/or the administrator of the Hubbard Brook Ecosystem Study with a pdf or two reprints of any publication(s) resulting from use of the Data Set.

7) Disclaimer. While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

8) Terms of Agreement. By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.



CONTACT PERSON

Information Manager, Hubbard Brook LTER
234 Mirror Lake Road
North Woodstock, NH 03262
USA

Phone: (603) 726-8902
Email: hbr-im@lternet.edu

Data file: w1sfchem.txt
Description: Hubbard Brook Canopy Foliage Chemistry--Watershed 1
Notes on Data: Data is located at the Fahey Lab, Cornell University. Dried sample material is archived in jars in the Hubbard Brook archive system.
ColumnVariableDescriptionUnitsCoded?Missing value label
1Yearyear collected in AugustYYYYnnone
2ElevElevation zonenoneynone
3SpeciesTree speciesnoneynone
4C %Percentage of carbon in dry leaf weightdimensionlessn
-
5N %Percentage of nitrogen in dry leaf weightdimensionlessn
-
6Ca ppmppm calciummicrogramPerGramnnone
7Mg ppmppm magnesiummicrogramPerGramnnone
8Mn ppmppm manganesemicrogramPerGramnnone
9K ppmppm potassiummicrogramPerGramnnone
10P ppmppm phosphorousmicrogramPerGramnnone

CODES

Variable: Elev
Description:
Text description of elevation zone, for example "Spruce-fir"
Variable: Species
SppNum
Species Code
Species/SppNum description
1
ABBA
Balsam fir (Abies balsamea)
2
PIRU
Red spruce (Picea rubens)
3
BEPA
White or paper birch (Betula papyrifera)

MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
C %
-
Data missing or not taken at this time
N %
-
Data missing or not taken at this time