Forest Inventory of the Climate Change Across Seasons Experiment (CCASE) plots at the Hubbard Brook Experimental Forest
TITLE
Forest Inventory of the Climate Change Across Seasons Experiment (CCASE) plots at the Hubbard Brook Experimental Forest
PRINCIPAL INVESTIGATOR(s)
Pamela Templer
Boston University
Department of Biology
5 Cummington Mall
Boston, MA 02215
US

Phone: 617-353-6978
OTHERS INVOLVED
Rebecca Sanders-DeMott
Boston University
Department of Biology
5 Cummington Mall
Boston, MA 02215
US
Jamie Harrison
Boston University
Department of Biology
5 Cummington Mall
Boston, MA 02215
US
Stephanie Juice
Boston University
Department of Biology
5 Cummington Mall
Boston, MA 02215
US
ABSTRACT:
DBH was measured for all trees greater than or equal to 5 cm DBH within Climate Change Across Seasons Experiment (CCASE) plots. Reference (or control) plots are shared with the collaborating Northern Forest DroughtNet experiment. There are six plots total (each 11 x 14m). Two are warmed 5 degrees C throughout the growing season (Plots 3 and 4). Two others are warmed 5 degrees C in the growing season and have snow removed during winter to induce soil freeze/thaw cycles (Plots 5 and 6). Four kilometers (2.5 mi) of heating cable are buried in the soil to warm these four plots. Two additional plots serve as controls for our experiment (Plots 1 and 2). This data set includes tree dbh measurements for 2012.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
DBH, ecosystems, forests, HBEF CCASE Plots, HBR, Hubbard Brook LTER, soil warming, snow removal, species, tree.
KEYWORD SET: LTER Core Research Areas
disturbance, populations.
BEGIN DATE
2012
END DATE
2012
LOCATION
CCASE (Climate Change Across Seasons Experiment)plots located north of the Pierce Laboratory.
West bounding coordinate: -71.702662
East bounding coordinate: -71.69936
North bounding coordinate: 43.94688
South bounding coordinate: 43.945197
RESEARCH SUMMARY
Mean annual temperatures for the northeastern U.S. are projected to increase 3-5 degrees C by the year 2100, which could increase water and nutrient uptake and carbon storage by trees. However, the increase in temperature will lead to a smaller winter snowpack and increased frequency of soil freeze/thaw cycles, which may offset the positive effects of warming by damaging roots. The overall result could be reduced nutrient uptake and storage of carbon and further elevation of atmospheric CO2 concentrations. Understanding the mechanisms and controls underlying changes in nutrient uptake by trees is necessary for improving predictions of how ecosystems will respond as the climate changes. Whereas many studies have evaluated the impacts of climate change on forests within a single season, few have examined the impacts of climate change across seasons and how these impacts interact. These "across season" effects could be antagonistic or synergistic, which would not be apparent from examining one season alone.
The goals of this research are to determine the interactive effects of winter and growing season climate on water and nutrient uptake and carbon sequestration in northern hardwood forests. These goals are being accomplished with a new ecosystem warming experiment at Hubbard Brook.
SITE DESCRIPTION
CCASE was established in a red maple (Acer rubrum) dominated forest in 2012. There are six plots total (each 11 x 14m). Two are warmed 5 degrees C throughout the growing season (Plots 3 and 4). Two others are warmed 5 degrees C in the growing season and have snow removed during winter to induce soil freeze/thaw cycles (Plots 5 and 6). Four kilometers (2.5 mi) of heating cable are buried in the soil to warm these four plots. Two additional plots serve as controls for our experiment (Plots 1 and 2).
FIELD COLLECTION PROCEDURES
On 28 September 2012 we tagged and measured the DBH of the trees in all 6 CCASE plots as follows:
- All trees greater than or equal to 5cm DBH were tagged, identified to species, and measured for DBH
- If a tree trunk divided lower than breast height, each trunk was measured and tagged separately.
- Breast height was defined as 1.37 m (4.5 feet) above the forest floor on the uphill side of the tree. We marked breast height on ourselves and used that mark to identify breast height on the trees.
- The diameter was measured using a diameter tape, the true diameter was measured meaning that if the tree leaned, then the diameter line leans with the tree rather than staying level with the ground.
- Trees were tagged on the uphill side of the tree, and a second nail was nailed into the opposite side of the bole to help line up the diameter tape for future measurements.
- The diameter tape was wrapped around the tree underneath the nails and the tag.
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: ccase_veg.txt
Description: Tree diameter measurements in the CCASE plots at the Hubbard Brook Experimental Forest.
Notes on Data: The original data is located in the Templer Lab, Boston University and was updated in November 2015.
ColumnVariableDescriptionUnitsCoded?Missing value label
1SiteName of experimental plotsnoneynone
2TreatmentType of experimental treatmentnoneynone
3PlotPlot numbernoneynone
4TreeTree tag numbernoneynone
5SpeciesFour letter tree species acronymnoneynone
6DateDate measurement was takenYYYY-MM-DDnnone
7DBHDiameter at breast height, in cmcentimeternnone

CODES

Variable: Site
Description:
Site is CCASE for all data in this dataset
Variable: Treatment
Code
Description
REF
Reference
WARM
Warming only
WARM+FTC
Warming + freeze/thaw cycles
Variable: Plot
Description:
A positive number representing an individual plot
Variable: Tree
Description:
A positive number representing an individual tree tag
Variable: Species
SppNum
Species Code
Species/SppNum description
1
ACRU
Red maple (Acer rubrum)
2
FAGR
American beech (Fagus grandifolia)
3
BEPA
White or paper birch (Betula papyrifera)
4
BEAL
Yellow birch (Betula alleghaniensis)
5
PIRU
Red spruce (Picea rubens)
6
POGR
Big-tooth aspen (Populus grandidentata)
7
ACSA
Sugar maple (Acer saccharum)