Forest Inventory of a Calcium Amended Northern Hardwood Forest: Watershed 1, 2006, Hubbard Brook Experimental Forest
TITLE
Forest Inventory of a Calcium Amended Northern Hardwood Forest: Watershed 1, 2006, Hubbard Brook Experimental Forest
PRINCIPAL INVESTIGATOR(s)
John J. Battles
University of California, Berkeley
Environmental Science, Policy, and Management
137 Mulford Hall
Berkeley, CA 94720-3114
USA

Phone: (510) 643-0684
Charles Driscoll
Department of Civil and Environmental Engineering, Syracuse University
151 Link Hall
Syracuse, NY 13244
USA
Scott Bailey
USDA Forest Service, Hubbard Brook Experimental Forest
234 Mirror Lake Road
North Woodstock, NH 03262
USA
Joel Blum
University of Michigan
Department of Earth and Environmental Sciences
1100 N Univ Ave
Ann Arbor, MI 48109
USA
Don Buso
Institute of Ecosystem Studies, Hubbard Brook Experimental Forest
234 Mirror Lake Road
North Woodstock, NH 03262
USA
Tim Fahey
Department of Natural Resources, Cornell University
104A Bruckner Hall
Ithaca, NY 14853
USA
Melany Fisk
Miami University
Department of Biology
160 Pearson Hall
Oxford, OH 45056
USA
Peter Groffman
Institute of Ecosystem Studies
Box AB
Millbrook, NY 12545
USA
Chris Johnson
Department of Civil and Environmental Engineering, Syracuse University
151 Link Hall
Syracuse, NY 13244
USA
Gene Likens
Institute of Ecosystem Studies
Box AB
Millbrook, NY 12545
USA
OTHERS INVOLVED
Natalie van Doorn
ABSTRACT:
In order to evaluate the role of Ca supply in regulating the structure and function of base-poor forest and aquatic ecosystems, the Ca content of soil was increased through the application of wollastonite (CaSiO3) in October 1999. Forest inventory surveys were initiated in 1996 and repeated at 5 year intervals. This data set includes 2006 inventory measurements.The data consists of a total inventory of all trees >=10 cm diameter-at-breast-height (dbh) on the whole of the watershed (11.8 ha), as measured in each of the 200 25 m x 25 m plots. Trees >=2 to <=10 cm dbh were subsampled using a 3 meter wide strip along one edge of each 25 m x 25 m plot. With the addition of tree tags in 2006 on all trees >=10 cm dbh, tracking of individual trees is now possible.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
biomass, calcium, diameter breast height, forests, HBEF Watershed 1, HBR, Hubbard Brook LTER, inventory, trees, vegetation, watersheds.
KEYWORD SET: LTER Core Research Areas
disturbance, primary production.
BEGIN DATE
2006
END DATE
2006
LOCATION
Watershed 1 is an 11.8 ha watershed extending from the weir at 488 m to the ridge at 747m.
West bounding coordinate: -71.730866
East bounding coordinate: -71.725832
North bounding coordinate: 43.959356
South bounding coordinate: 43.952121
Elevation
Minimum: 488
Maximum: 747
(Unit: meter)
LOCATION DESCRIPTION
In order to evaluate the role of Ca supply in regulating the structure and function of base-poor forest and aquatic ecosystems, the Ca content of soil was increased through the application of wollastonite (CaSiO3) in October 1999. A link to more information about the study can be found in ADDITIONAL RESOURCES
SAMPLING BACKGROUND
Surveys were initiated in 1996 and repeated at 5 year intervals after that. Repeated inventory at 5 year intervals is anticipated to continue. The data in this dataset were collected in the summer of 2006. 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 plot system. See the following webpages for more information:
http://www.hubbardbrook.org/watersheds/maps/w1_grid_map.htm
http://www.hubbardbrook.org/watersheds/w1_grid_elevations.htm.
SAMPLING DESIGN
The inventory consists of a total inventory of all trees >=10 cm dbh on the whole of the watershed (11.8 ha), as measured in each of the 200 25 m x 25 m plots. Trees >=2 to <=10 cm dbh were subsampled using a 3 meter wide strip along one edge of each 25 m x 25 m plot.
DATA DESCRIPTION
The data consist of the diameters (dbh) of all the trees >=10 cm dbh, live and dead, in the whole of the watershed (8184 individual stems). Dead trees were recorded as standing dead trees (trees dead but retaining most of their fine branches) and as snags (trees broken off above dbh or with only their major large branches still intact). Live trees were noted "sick" if they had very sparse foliage or yellowing foliage in the mid summer sampling. A subsample of trees >=2 cm dbh and <=10 cm dbh were measured at the same time (3193 individual stems). All stems that met the size criteria were measured individually, and in some years it was noted whether a stem was part of a group of stems from the same tree (i.e. multiple stems that split from a single trunk below breast height). For W1, whether or not a stem was part of a group was recorded in all survey years through 2001.
NOTES
It is not possible to compare pre-2006 data between sampling years on a plot by plot basis. This is because trees were not individually tagged and trees on the lines between plots can "drift" between plots between years depending on the observers line of sight or decision as to whether the center of the base of a tree is in one plot or the adjoining plot. With the addition of tree tags in 2006, tracking of individual trees is now possible.
Subsequent surveys of tagged trees allow for corrections to be made. For example, it is possible to tag trees that had been clearly missed in the previous survey (trees >19.5 cm dbh as measured in 2011 – the cutoff was based on observed maximum 5-year increment from tree rings). Another benefit of tagged tree inventories is that it is possible to catch field blunders as defined by extraordinary negative or positive diameter growth. Such examples are coded in the dataset under the variable AnalysisCode, where an“I”signifies that the dbh in 2006 was interpolated by regression from 2011 survey data. It is not recommended that these trees be used for demographic analyses since the growth has been estimated.
Watershed 1 contains two rain gauge clearings within its boundaries. This reduces the forested area of the watershed and complicates calculation of plot area. For those plots that lie wholly or partially within a clearing, an adjustment is made in the calculation of plot area to include only the forested portion of the plot. Plot 144 is the only plot that lies entirely within a clearing and contains no trees. The middle rain gauge (#2) was extended between the 2006 and 2011 inventories. Tagged trees were felled and some of the leftover trees became edge trees to the clearing. To ensure that the clearing would not bias biomass or demographic summaries of the surviving trees, the following plots were excluded from the 2011 database: 131, 133, 137, 138, 139, 140, 143, 145, 146, 149, 150, 151. For extensive notes about the details of these surveys and subsequent calculations, see the notes indicated at the bottom of the interactive calculation programs (link provided in ADDITIONAL RESOURCES section).
ADDITIONAL RESOURCES
REFERENCES
  • Bormann, F.H., Siccama, T.G., Likens, G.E., and Whittaker, R.H. 1970. Hubbard Brook Ecosystem Study: composition and dynamics of the tree stratum. Ecol. Monogr. 40(4):373-388.
  • Whittaker, R.H., Bormann, F.H., Likens, G.E., and Siccama, T.G. 1974. The Hubbard Brook Ecosystem Study: forest biomass and production. Ecol. Monogr. 44(2):233-254.
  • Whittaker, R.H., Likens, G.E., Bormann, F.H., Eaton, J.S., and Siccama, T.G. 1979. Hubbard Brook Ecosystem Study: forest nutrient cycling and element behavior. Ecology 60(1):203-220.
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.

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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: w1_2006veg.txt
Description: Tree inventory data for Watershed 1, 2006, at the Hubbard Brook LTER. Vigor codes 1 and 2 are deprecated for 2006 and later data; beech health was recorded using codes 3 - 6.
Notes on Data: The data is physically located at the Battles Laboratory, Environmental Science, Policy, and Management, University of California, Berkeley. Last updated in May 2013.
ColumnVariableDescriptionUnitsCoded?Missing value label
1Yearsample yearYYYYnnone
2Watershedwatershed numbernoneynone
3Plotplot numbernoneynone
4Zonevegetation zonenoneynone
5Speciesspecies acronymnoneynone
6SppNumspecies numbernoneynone
7SeqSequence number. Unique number for each tree.noneynone
8TagTree tag numbernoney
0
9Dbhdiameter at breast height, in cmcentimeternnone
10Vigorvigor codenoneynone
11AbvBmssaboveground biomass in kilograms estimated for each stemkilogramnnone
12BlwBmssbelowground biomass in kilograms estimated for each stemkilogramnnone
13TwotoTenpresence (1) or absence (0) of measured trees in the 2 - 10 cm diameter class for that plot (in some years, not all plots were measured)noneynone
1410AreaArea of plot on which trees >10 cm dbh were measured (m-2)meterSquaredn
0
15TwotoTenAreaArea of plot on which trees 2-10 cm dbh were measured (m-2)meterSquaredn
0
16ElevBNew category of elevation zone used for 2006 and later collectionsnoneynone
17AnalysisCodeAnalysis codenoneynone

CODES

Variable: Watershed
Code
Description
1
the number of the watershed is 1 throughout this dataset
Variable: Plot
Description:
An integer representing the plot
Variable: Zone
Code
Description
1
birch and fern glade on the west side of the ridge top - 8 plots
2
spruce/fir flat area on the east side of the ridge top - 12 plots
3
high hardwoods just below the ridgetop - 26 plots
4
spruce/fir on cliffs and ledges in the middle of the high hardwoods - 11 plots
5
mid elevation hardwoods with deeper soil - 48 plots
6
poorly-formed hardwoods on ledges on the east side of the central watershed - 41 plots
7
low elevation hardwoods - 54 plots
Variable: Species, SppNum
SppNum
Species Code
Species/SppNum description
1
ACSA
Sugar maple (Acer saccharum)
2
FAGR
American beech (Fagus grandifolia)
3
BEAL
Yellow birch (Betula alleghaniensis)
4
FRAM
White ash (Fraxinus americana)
5
ACSP
Mountain maple (Acer spicatum)
6
ACPE
Striped maple or moose wood (Acer pensylvanicum)
7
PRPE
Pin or fire cherry (Prunus pensylvanica)
8
PRVI
Choke cherry (Prunus virginiana)
9
ABBA
Balsam fir (Abies balsamea)
10
PIRU
Red spruce (Picea rubens)
11
BEPA
White or paper birch (Betula papyrifera)
12
SOAM
Mountain ash (Sorbus americana)
13
ACRU
Red maple (Acer rubrum)
14
TSCA
Eastern hemlock (Tsuga canadensis)
15
UNKN
unknown, used for unidentifiable rotten snags
16
POTR
Quaking aspen (Populus tremuloides)
17
PRSE
Black cherry (Prunus serotina)
18
AMSP
Shadbush (Amelanchier sp.)
19
POGR
Big-tooth aspen (Populus grandidentata)
20
SASP
Willow (Salix sp.)
21
COAL
Alternate-leaved dogwood (Cornus alternifolia)
22
PRSP
Cherry (unspecified) (Prunus sp.)
23
SARA
Red elderberry (Sambucus racemosa)
Variable: Seq
Description:
A positive number representing the sequence number of an individual tree
Variable: Tag
Description:
A positive number or number-letter combination representing an individual tree tag
Variable: Vigor
Code
Description
0
healthy
3
sick (trees with crown in decline)
4
standing dead tree
5
standing dead snag (no limbs left)
6
a downed dead tree including any dead tree that is broken or detached below dbh
Variable: TwotoTen
Code
Description
1
Presence
0
Absence
Variable: ElevB
Code
Description
H
High elevation, >710 meters
M
Mid elevation, 630 - 710 meters
L
Low elevation, <630 meters
Variable: AnalysisCode
Code
Description
I
dbh in 2006 is interpolated by regression from 2011 dbh

MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
Tag
0
Tree did not have a tag
10Area
0
Area does not apply to the current sample
TwotoTenArea
0
Area does not apply to the current sample