TITLE
Forest Floor Mass, Organic Matter and Chemistry (Ca, Mg, K, P, Mn and some trace metals): Watershed 1 in 2000 (after the calcium addition)
PRINCIPAL INVESTIGATOR(s)
Charley
Driscoll
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY
USA
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY
USA
Scott
Bailey
USDA Forest Service, Hubbard Brook Experimental Forest
Campton, NH 03223
USA
USDA Forest Service, Hubbard Brook Experimental Forest
Campton, NH 03223
USA
Joel
Blum
Department of Geological Sciences, The University of Michigan
Ann Arbor, MI 48109
USA
Department of Geological Sciences, The University of Michigan
Ann Arbor, MI 48109
USA
Don
Buso
Institute of Ecosystem Studies, Hubbard Brook Experimental Forest
Campton, NH 03223
USA
Institute of Ecosystem Studies, Hubbard Brook Experimental Forest
Campton, NH 03223
USA
Chris
Eagar
USDA Forest Service, Northeastern Research Station
Durham, NH 03824
USA
USDA Forest Service, Northeastern Research Station
Durham, NH 03824
USA
Tim
Fahey
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Melany
Fisk
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Peter
Groffman
Institute of Ecosystem Studies
Millbrook, NY 12545
USA
Institute of Ecosystem Studies
Millbrook, NY 12545
USA
Chris
Johnson
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY 13244
USA
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY 13244
USA
Gene
Likens
Institute of Ecosystem Studies
Millbrook, NY 12545
USA
Institute of Ecosystem Studies
Millbrook, NY 12545
USA
Thomas G.
Siccama
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
OTHERS INVOLVED
Thomas G.
Siccama
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
Chris
Johnson
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY 13244
USA
Department of Civil and Environmental Engineering, Syracuse University
Syracuse, NY 13244
USA
Tim
Fahey
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Department of Natural Resources, Cornell University
Ithaca, NY 14853
USA
Steve
Hamburg
Center for Environmental Studies, Urban Ecology Laboratory, Brown University
Providence, RI 02912
USA
Center for Environmental Studies, Urban Ecology Laboratory, Brown University
Providence, RI 02912
USA
BEGIN DATE
1996
END DATE
Ongoing
LOCATION
Watershed 1 is a 11.8 ha watershed extending from the weir at 488 m to the ridge at 747 m
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 488
Maximum: 747
(Unit: meter)
Maximum: 747
(Unit: meter)
SAMPLING BACKGROUND
Hydrology has been monitored since 1956, and stream water chemistry has been monitored since 1963. The watershed is forested by typical northern hardwood species (sugar maple, beech and yellow birch) on the lower 90 % of its area, and by a montane boreal transition forest of red spruce, balsam fir and white birch on the highest 10%. Surveying techniques were used in 1996 to install a grid system of 200 grid cells, each 25 x 25 m square (slope corrected). These grid units serve as the coordinate system for sample plot selection. For more spatial information please visit the following links: http://www.hubbardbrook.org/watersheds/maps/w1_grid_map.htm and http://www.hubbardbrook.org/watersheds/w1_grid_elevations.htm.
The watershed was surveyed in 1996 and calcium was added in October 1999. A pre-calcium addition forest floor survey was completed in 1996, and another in 1998. The first post-treatment survey was conducted in 2000. This data set was collected in the summer of 2000. Repeated sampling at 1 to 5 year intervals is anticipated to continue.
SAMPLING DESIGN
The watershed was surveyed in 1996 and calcium was added in October 1999. A pre-calcium addition forest floor survey was completed in 1996, and another in 1998. The first post-treatment survey was conducted in 2000. This data set was collected in the summer of 2000. Repeated sampling at 1 to 5 year intervals is anticipated to continue.
Each row of the Watershed 1 grid system of 25 x 25 m cells was considered a stratified sampling set and one or more cells was randomly chosen from these lines as cells to be sampled. Some rows are short, with only 1 to 4 cells, and others are longer, up to 9 cells across. The longer rows may have 3 or 4 cells sampled. The short rows may not have any cells sampled. The location of the sampling plot within each cell was selected by an x-y random number system and the location determined by pacing in to the selected coordinates from the corner of the 25 x 25 m cell. 100 of the 200 cells were sampled in 2000.
FIELD COLLECTION PROCEDURES
Once a sampling point was located by pacing, a 15 x 15 cm wooden template was placed on the forest floor and 4 nails were placed through pre-drilled holes, one on each corner. This served to hold the template in place on the forest floor and retain the forest floor material within the sample area beneath the template. A keyhole saw, clippers and a trowel were used to make a clean cut around the template, thus isolating a block of forest floor. The surrounding forest floor material was scraped back from the block leaving it as a pedestal. This block was then undercut in the mineral soil with a saw or trowel to sever any roots. Using a trowel slid beneath the block and our hands on top, the block was carefully picked up and turned over such as to rest on the wooden template. Any remaining mineral soil was carefully scraped away "up" to the bottom of the Oa layer of the forest floor. After all such mineral soil was removed, the total thickness of the block was measured in two places on each of the 4 sides (8 measurements). The thickness of only the Oie was measured in the same manner. Oa thickness was later determined by subtraction of the average Oie thickness from the average total thickness for each block. The block was then separated into Oie and Oa, and each placed in a separate plastic bag for return to the laboratory.
NOTES
Long term forest floor sampling has been carried out on Watershed 6 since 1970. Watershed 1 was added to this sampling in 1996 as part of the calcium addition experiment.
LABORATORY PROCEDURES
The Oie was oven dried at 80 oC to a constant weight, and ground in a Wiley mill to pass a 2 mm screen. Large solid sticks and roots larger than the size of a pencil and obviously alive or fresh, were removed and weighed. These were not ground and were not included in the Oie forest floor mass calculations. The Oa was air dried, weighed and then sieved through a 0.5 cm stainless steel screen. Sticks, roots and debris (coarse fraction) not passing through the screen with mild pressure were weighed. Stones which were rarely present in the Oa, were also included in the coarse fraction. Material passing through the screen was weighed and rebagged. A subsample of this air dry screened soil was weighed, oven dried at 80 oC and weighed again. Then an air dry to oven dry conversion factor was determined in order to express the total Oa soil mass on an oven dry weight basis. The oven dried subsample of Oa was ground in a Wiley mill to pass a 2 mm screen and stored in a paper envelope. Samples of the ground/screened Oie and Oa were put in 4 oz. glass jars for long term preservation in the Hubbard Brook archives. All residual material, including sticks and roots screened out of the samples, have been put in boxes for preservation.
For determination of organic content and chemical analysis, a 0.5 g sample of the oven dry ground material was placed in a pre-weighed crucible and ashed overnight at 500 oC. The ashed material was cooled and weighed. The ash was eluted with 8 ml of 6N HNO3 and heated for a few minutes (to a simmer) on a hot plate. The hot extract solution was poured into a filter paper (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 distilled deionized water. The 50 ml of extract solution was then placed in 60 ml plastic bottles for storage until chemical analysis. The ash remaining on the filter paper was saved and later put in 4 oz. jars. The elements Ca, Mg, K, P, Mn, Zn, Pb and Cu were determined for each sample using an ICP spectrometer. The ash remaining on the filter paper will be dissolved in hydrofluoric acid and analyzed for these elements. Carbon and nitrogen were determined using oven dried ground material on a CHN analyzer--C and N data are not yet available. These elements are being analyzed by Steve Hamburg at Brown University.
CALCULATIONS
For determination of organic content and chemical analysis, a 0.5 g sample of the oven dry ground material was placed in a pre-weighed crucible and ashed overnight at 500 oC. The ashed material was cooled and weighed. The ash was eluted with 8 ml of 6N HNO3 and heated for a few minutes (to a simmer) on a hot plate. The hot extract solution was poured into a filter paper (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 distilled deionized water. The 50 ml of extract solution was then placed in 60 ml plastic bottles for storage until chemical analysis. The ash remaining on the filter paper was saved and later put in 4 oz. jars. The elements Ca, Mg, K, P, Mn, Zn, Pb and Cu were determined for each sample using an ICP spectrometer. The ash remaining on the filter paper will be dissolved in hydrofluoric acid and analyzed for these elements. Carbon and nitrogen were determined using oven dried ground material on a CHN analyzer--C and N data are not yet available. These elements are being analyzed by Steve Hamburg at Brown University.
Concentrations of elements in the forest floor were calculated on an oven dry weight basis. Total amounts of the elements were estimated on a per square meter basis by extrapolating up from the 15 x 15 cm sample mass. Forest floor thickness, species contributing litter to the sample site, and E horizon intensity for each plot are given in dataTable 1. Total mass, organic matter mass, and LOI of the forest floor are presented in dataTable 2. Amounts of Ca, Mg, K, P, Mn, Cu, Zn and Pb are presented in dataTable 3. Concentrations of Ca, Mg, K, P, Mn, Cu, Zn and Pb are presented in dataTable 4.
DATA ACCESS GUIDELINES
Publications using these data from the Hubbard Brook Ecosystem Study must include the following paragraph: Some data used in this publication were obtained by scientists of the Hubbard Brook Ecosystem Study; this publication has not been reviewed by those scientists. The Hubbard Brook Experimental Forest is operated and maintained by the Northeastern Research Station, U.S. Department of Agriculture, Newtown Square, Pennsylvania. Please note that data sharing and availability policy varies among the datasets available. Publishers of Hubbard Brook data are encouraged to contact the original data provider to obtain information for an acknowledgement of the original funding source of the research.
The access to all LTER data is subject to requirements set forth by this policy document to enable data providers to track usage, evaluate its impact in the community, and confirm users' acceptance of the terms of acceptable use. These requirements are standardized across the LTER Network to provide contractual exchange of data between Site Data Providers, Network Data Providers, and Data Users that can be encoded into electronic form and exchanged between computers. This will allow direct access to data via a common portal once these requirements have been fulfilled. The following information may be required directly or by proxy prior to the transference of any data object:
Registration
Name
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Email address
Full Contact Info
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A Statement of Intended Use that is compliant with the above agreements. Such statements may be made submitted explicitly or made implicitly via the data access portal interface.
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:
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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.
By viewing or downloading the data, I certify that I accept the conditions herein
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.
Digital data and its metadata derived from any research activity such as field observations, collections, laboratory analysis, experiments, or the post-processing of existing data and identified by a unique identifier issued by a recognized cataloging authority such as a site, university, agency, or other organization.
ndividual to whom access has been granted to this Data Set, including his or her immediate collaboration sphere, defined here as the institutions, partners, students and staff with whom the Data User collaborates, and with whom access must be granted, in order to fulfill the Data User's intended use of the Data Set
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individual or institution providing access to the Data Sets.
party designated in the accompanying metadata of the Data Set as the primary contact for the Data Set.
The access to all LTER data is subject to requirements set forth by this policy document to enable data providers to track usage, evaluate its impact in the community, and confirm users' acceptance of the terms of acceptable use. These requirements are standardized across the LTER Network to provide contractual exchange of data between Site Data Providers, Network Data Providers, and Data Users that can be encoded into electronic form and exchanged between computers. This will allow direct access to data via a common portal once these requirements have been fulfilled. The following information may be required directly or by proxy prior to the transference of any data object:
Registration
Name
Affiliation
Email address
Full Contact Info
Acceptance of the General Public Use Agreement or Restricted Data Use Agreement, as applicable
A Statement of Intended Use that is compliant with the above agreements. Such statements may be made submitted explicitly or made implicitly via the data access portal interface.
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:
Acceptable Use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite 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.
Acknowledgement. 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 significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers.
Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.
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.
By viewing or downloading the data, I certify that I accept the conditions herein
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.
Digital data and its metadata derived from any research activity such as field observations, collections, laboratory analysis, experiments, or the post-processing of existing data and identified by a unique identifier issued by a recognized cataloging authority such as a site, university, agency, or other organization.
ndividual to whom access has been granted to this Data Set, including his or her immediate collaboration sphere, defined here as the institutions, partners, students and staff with whom the Data User collaborates, and with whom access must be granted, in order to fulfill the Data User's intended use of the Data Set
individual or institution that produced the Data Set
individual or institution that holds intellectual property rights to the dataset. Note that this may or may not be defined as a legal copyright. If no other party is designated in the metadata as Data Set Owner, it may be presumed that these rights are held by the Data Set Creator.
individual or institution providing access to the Data Sets.
party designated in the accompanying metadata of the Data Set as the primary contact for the Data Set.
NOTES ON DATA
Original field data sheets are in Greeley Lab, 370 Prospect Street, Yale School of Forestry and Environmental Studies. Samples of forest floor material in jars will be located in the USFS archive building at the HBEF in Woodstock, NH. Residual material (extra) is in boxes at Greeley Lab at the Yale Forestry School.
CONTACT PERSON
Thomas G.
Siccama
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
Phone: (203)-432-5140
Email: tgs3@pantheon.yale.edu
Yale School of Forestry and Environmental Studies
New Haven, CT 06511
USA
Phone: (203)-432-5140
Email: tgs3@pantheon.yale.edu
Data file:
w100ffa.txt
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Element amounts
CODES
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Element amounts
| Column | Variable | Description | Units | Coded? | Missing value label |
| 1 | Plot | Plot# | none | y | none |
| 2 | Calcium (g/m2) Oie | Calcium amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 3 | Calcium (g/m2) Oa | Calcium amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 4 | Calcium (g/m2) Total | Calcium amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 5 | Magnesium (g/m2) Oie | Magnesium amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 6 | Magnesium (g/m2) Oa | Magnesium amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 7 | Magnesium (g/m2) Total | Magnesium amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 8 | Potassium (g/m2) Oie | Potassium amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 9 | Potassium (g/m2) Oa | Potassium amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 10 | Potassium (g/m2) Total | Potassium amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 11 | Phosphorous (g/m2) Oie | Phosphorous amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 12 | Phosphorous (g/m2) Oa | Phosphorous amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 13 | Phosphorous (g/m2) Total | Phosphorous amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 14 | Manganese (g/m2) Oie | Manganese amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 15 | Manganese (g/m2) Oa | Manganese amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 16 | Manganese (g/m2) Total | Manganese amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 17 | Copper (g/m2) Oie | Copper amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 18 | Copper (g/m2) Oa | Copper amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 19 | Copper (g/m2) Total | Copper amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 20 | Zinc (g/m2) Oie | Zinc amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 21 | Zinc (g/m2) Oa | Zinc amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 22 | Zinc (g/m2) Total | Zinc amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
| 23 | Lead (g/m2) Oie | Lead amount for Oie (g/m2) | gramsPerSquareMeter | n | none |
| 24 | Lead (g/m2) Oa | Lead amount for Oa (g/m2) | gramsPerSquareMeter | n | none |
| 25 | Lead (g/m2) Total | Lead amount for forest floor in total (g/m2) | gramsPerSquareMeter | n | none |
Variable: Plot
|
Description:
|
A counting number representing an existent plot
|
Data file:
w100ffc.txt
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Element concentrations
CODES
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Element concentrations
| Column | Variable | Description | Units | Coded? | Missing value label |
| 1 | Plot | Plot# | none | y | none |
| 2 | Calcium (ppm) Oie | Calcium concentration for Oie (ppm of oven dry sample) | number | n | none |
| 3 | Calcium (ppm) Oa | Calcium concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 4 | Magnesium (ppm) Oie | Magnesium concentration for Oie (ppm of oven dry sample) | number | n | none |
| 5 | Magnesium (ppm) Oa | Magnesium concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 6 | Potassium (ppm) Oie | Potassium concentration for Oie (ppm of oven dry sample) | number | n | none |
| 7 | Potassium (ppm) Oa | Potassium concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 8 | Phosphorous (ppm) Oie | Phosphorous concentration for Oie (ppm of oven dry sample) | number | n | none |
| 9 | Phosphorous (ppm) Oa | Phosphorous concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 10 | Manganese (ppm) Oie | Manganese concentration for Oie (ppm of oven dry sample) | number | n | none |
| 11 | Manganese (ppm) Oa | Manganese concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 12 | Copper (ppm) Oie | Copper concentration for Oie (ppm of oven dry sample) | number | n | none |
| 13 | Copper (ppm) Oa | Copper concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 14 | Zinc (ppm) Oie | Zinc concentration for Oie (ppm of oven dry sample) | number | n | none |
| 15 | Zinc (ppm) Oa | Zinc concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
| 16 | Lead (ppm) Oie | Lead concentration for Oie (ppm of oven dry sample) | number | n | none |
| 17 | Lead (ppm) Oa | Lead concentration for Oa (ppm of oven dry sample) | number | n | -8888 |
Variable: Plot
|
Description:
|
A counting number representing an existent plot
|
Data file:
w100ffe.txt
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Field data
CODES
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Field data
| Column | Variable | Description | Units | Coded? | Missing value label |
| 1 | Plot | Plot# | none | y | none |
| 2 | E Code | E horizon development intensity | none | y | -9999 |
| 3 | Major species (1) | One of the three most important species directly over the plot | none | y | XXXX |
| 4 | Major species (2) | One of the three most important species directly over the plot | none | y | XXXX |
| 5 | Major species (3) | One of the three most important species directly over the plot | none | y | XXXX |
| 6 | Total thickness (cm) (1) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | none |
| 7 | Total thickness (cm) (2) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | none |
| 8 | Total thickness (cm) (3) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | none |
| 9 | Total thickness (cm) (4) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | none |
| 10 | Total thickness (cm) (5) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | -9999 |
| 11 | Total thickness (cm) (6) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | -9999 |
| 12 | Total thickness (cm) (7) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | -9999 |
| 13 | Total thickness (cm) (8) | One of eight measures of thickness of forest floor block (in centimeters) | centimeter | n | -9999 |
| 14 | Oie thickness (cm) (1) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | none |
| 15 | Oie thickness (cm) (2) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | none |
| 16 | Oie thickness (cm) (3) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | none |
| 17 | Oie thickness (cm) (4) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | none |
| 18 | Oie thickness (cm) (5) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | -9999 |
| 19 | Oie thickness (cm) (6) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | -9999 |
| 20 | Oie thickness (cm) (7) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | -9999 |
| 21 | Oie thickness (cm) (8) | One of eight measures of thickness of Oie (in centimeters) | centimeter | n | -9999 |
Variable: Plot
|
Description:
|
plots 1 to 200 from the top of the watershed to the base (not all plots were sampled)
|
|
Code
|
Description
|
|
0
|
none
|
|
1
|
weak -- "salt and pepper"
|
|
1.5
|
moderate
|
|
2
|
good -- clearly present
|
|
3
|
excellent -- deep and well-developed
|
|
Code
|
Description
|
|
ACSA
|
Acer saccharum (Sugar Maple)
|
|
FAGR
|
Fagus grandifolia (American beech)
|
|
BEAL
|
Betula alleghaniensis (Yellow birch)
|
|
FRAM
|
Fraxinus americana (White ash)
|
|
ACSP
|
Acer spicatum (Mountain maple)
|
|
ACPE
|
Acer pensylvanicum (Striped maple or moose wood)
|
|
ABBA
|
Abies balsamea (Balsam fir)
|
|
PIRU
|
Picea rubens (Red spruce)
|
|
BEPA
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Betula papyrifera (White or paper birch)
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SOAM
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Sorbus americana (Mountain ash)
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ACRU
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Acer rubrum (Red maple)
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Data file:
w100ffm.txt
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Mass data
CODES
Description: Hubbard Brook Forest Floor Data - Watershed 1 2000 - 100 15x15 cm excavated blocks Mass data
| Column | Variable | Description | Units | Coded? | Missing value label |
| 1 | Plot | Plot# | none | y | none |
| 2 | Oie Total kg/m2 | Oven dry wt of total mass of Oie (kg/m2) | kilogramsPerSquareMeter | n | none |
| 3 | OM Mass kg/m2 | Oven dry wt of organic matter mass of Oie (kg/m2) | kilogramsPerSquareMeter | n | none |
| 4 | LOI % | Loss on Ignition of Oie (%) | dimensionless | n | none |
| 5 | Oa Total kg/m2 | Oven dry wt of total mass of Oa (kg/m2) | kilogramsPerSquareMeter | n | none |
| 6 | OM Mass kg/m2 | Oven dry wt of organic matter mass of Oa (kg/m2) | kilogramsPerSquareMeter | n | none |
| 7 | LOI % | Loss on Ignition of Oa (%) | dimensionless | n | -8888 |
Variable: Plot
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Description:
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A counting number representing an existent plot
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