Arctic LTER

Weather at Toolik

Arctic LTER Database

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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, 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.
2 ) 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.
3 ) 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. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml

4 ) 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. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

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Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	2012_GS_ITEX_PF_RawPinDrop_Data.03
Dataset Title:	Raw pin-hit data from 19 1m x 1m point frame plots sampled near the LTER Shrub plots at Toolik Field Station in AK the summer of 2012.
Investigator 1:
First Name:	Gaius
Last Name:	Shaver
Organization:	Ecosystems Center at the Marine Biological Laboratory
Address line 2:	7 MBL Street
Address line 3:
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	United States
Investigator 2:
First Name:	Edward
Last Name:	Rastetter
Organization:	Ecosystems Center at the Marine Biological Laboratory
Address line 2:	7 MBL Street
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	United States
Investigator 3:
First Name:	Mathew
Last Name:	Williams
Organization:	University of Edinburgh
Address line 2:	School of Geosciences
City:	Edinburgh
State:
Zip Code:	EH9 EJU
Country:	United Kingdom
Investigator 4:
First Name:	James
Last Name:	Laundre
Organization:	Ecosystems Center at the Marine Biological Laboratory
Address line 2:	7 MBL Street
Address line 3:
City:	Woods Hole
Zip Code:	02543
Country:	United States
Investigator 5:
First Name:	Laura
Last Name:	van der Pol
Organization:	Ecosystems Center at the Marine Biological Laboratory
Address line 2:	7 MBL Street
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	United States
Associate Investigators:
Keywords:	photosynthesis; shrub canopy; point frame
Abstract:	This dataset includes every pin-hit recorded from 19 1m x 1m point frame plots of tall Betula nana and Salix pulchra canopies sampled at the Toolik Field Station, AK the summer of 2012. Twenty-five evenly spaced holes within the plot were sampled for each point frame for which the height and species was recorded for each leaf, stem, or plant that intersected the pin when lowered perpendicular to the ground. Non-woody species were grouped into functional groups (e.g. forb, graminoid, moss) and not identified to species. Stem diameter and the length of gramminoid blades were also recorded.
For questions about the Metadata and data contact the Investigators. For information about this web site contact:	Arctic LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7496 Email: arc_im@mbl.edu Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL	http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10145&urlTail=terrest/tracegas/data/2012_GS_ITEX_PF_RawPinDrop_Data.csv
Data File Name	2012_GS_ITEX_PF_RawPinDrop_Data
Beginning Date	6/23/2012
End Date	8/7/2012
Number of Data Records	3519
Other Files to Reference	2012_GS_ITEX_BF3_DiffuseLightData; 012_GS_ITEX_CH_SoilData; 2012_GS_ITEX_CHFluxData; 2012_GS_ITEX_LC_ParameterSummary; 2012_GS_ITEX_MaxCanopyHeight; 2012_GS_ITEX_PercentCover; 2012_GS_ITEX_CHN_Data; 2012_GS_ITEX_PF_LAISummary; 2012_GS_ITEX_RawPinDrop_Data; 2012_GS_ITEX_ShootACiData; 2012_GS_ITEX_ShootHarvestData; 2012_GS_ITEX_ShrubCanopy_DailyLogger; 2012_GS_ITEX_InstantLogger; 2012_GS_ITEX_SunScan_LAI; 2012_GS_ITEX_SunScan_PAR; 2012_GS_PFandCH_GPS; 2012_GS_ITEX_PF_ShootLightCurve; 2003-2004gsfluxleafN; 2003-2009gscurveparameters; 2003-2009gsflux; 2003-2009gsGPSandveg; 2003-2009gsharvestLAI-N; 2003-2009gsspecieslist; 2004-2009gscoverft; 2004-2009gscoversp;
Availability Status	1
Quality Control Information
Maintenance Description	This was a season-long project, though it followed similar methods to ITEX projects performed starting in 2003 that are likely to be replicated in the future for reasearch at the Toolik Field Station, AK.
Log of Changes:	Version 2: Missing values changed to #N/A. CH 28Jan2013
	Version 3: Metadata updated to newer form (with sites sheet). CH April 2013.
	Version 4: Corrected eml excel file name wrong extension. JimL 16May13

RESEARCH LOCATION:
Location Name	LTER Shrub Block 1	LTER Shrub Block 2	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One
Geographic Description	Upland site; co-located in Block 1 of the Shrub LTER sites; IVO 68° 38'18.8" N, 149° 34' 07.2" W +/- 50m. Except for plots marked "FERT", plots are outside of the designated LTER treatments, though are exposed to the same environmental conditions. All plots were chosen by the dominant shrub canopy (either Salix pulchraor Betula nana) and preferentially selected to be 90cm+ in height.	Outlet site; co-located in Block 2 of the Shrub LTER sites; IVO 68° 38'008.1" N, 149° 35' 017.1" W +/- 50m. Except for plots marked "FERT", plots are outside of the designated LTER treatments, though are exposed to the same environmental conditions. All plots were chosen by the dominant shrub canopy (either Salix pulchraor Betula nana) and preferentially selected to be 90cm+ in height.	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude	68.6385555555555	68.6355833333333	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	-149.568666666666	-149.588083333333	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Elevation	747 m	730 m	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters
Link to Google Map	View on Google Map	View on Google Map


TAXONOMIC COVERAGE:
Organisms studied	Betula nana; Salix pulchra; Salix glauca

Methods:	We preferentially selected tall shrub canopies dominated either by Betula nana or Salix pulchra, that is canopies that were greater than 75 cm height. Care was taken to select fairly uniform canopies, that is avoiding the edge of a shrub stand or areas where the canopy had a large gaps, suggesting the area may have been disturbed. We used point frames constructed from a 1.1 m x 1.1 m aluminum square with holes in each corner to accomodate steel rod posts used as the legs of the point frame. In this way, the frame could rest upon the four leg posts that had been hammered into the ground and remain adjustable in each corner. The frame had a level on each side, and great care was taken to ensure that the frame was (a) unable to be pushed deeper into the ground and, (b) level on all four sides prior to taking measurements. These factors were important to the measurement to have accurate data regarding the distance from the frame and the overall height of each point sampled in the canopy. The aluminum frame had numbered, regularly spaced holes on two opposite sides in order to accomodate a metal bar that could be placed across the frame and locked into place. [These holes on the frame are the row numbers.] The bar that was placed across the frame similarly had numbered, evenly spaced holes in order to accomodate a pin--a long (100-200cm) metal rod with a diameter of ~3.175 mm. [The holes on this bar are the pin hole numbers.] Measurements were only ever taken from odd row numbers, and alternated even/odd pin hole numbers with each row; in this way, for every plot 25 evenly spaced locations were sampled covering an area of one square meter. The length of the pin was marked every half-centimeter so that the distance could be read easily. Measurements were made by lowering the pin through a pin hole and, once encountering a leaf or stem, recording the following: row#, pin hole#, hit#, and the species hit. If the object hit was not a leaf, the plant tissue was noted; the diameter of each stem hit was estimated in millimeters, and the length of every graminoid blade hit was recorded from the point at which it was hit to the tip. As the primary species of interest for this project were for a select number of species (B. nana, S. pulchra, S. glauca, S. reticulata, V. uliginosum, V. vitis, L. palustre), species that were not the target of interest were classified as functional groups--e.g. graminoid spp., forb, moss. The last pin-hit recorded for each pin hole was always at the "soil" which was considered to be the transition between the green and brown plant material, often in a mossy layer. These data can be used in conjunction with the other data collected from these same plots--leaf area index, light and A-Ci response curves of shoots taken at different segments of the canopy.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
YEAR	year of measurement	datetime		YYYY
DATE	date of measurement	datetime		DD-MMM-YY
SITE	Toolik	text
GROUP	Measurement location in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 = Upland, IVO Block 2 = Outlet	text
PLOT	Individual plot identifier	text
TREATMENT	control or fertilized annually (with N and P)	text
PLOT SIZE	1m x 1m point frame size	text
DOM VEG	Dominant canopy vegetation	text
ROW#	Row number on the point frame where pin-drop measurement were taken	number	number
PIN HOLE#	Pin hole where pin-drop measurements were taken	number	number
PIN HIT#	Sequential numbering of order that measurements were taken starting from the top of the canopy	number	number
DISTANCE FROM FRAME	Distance of the pin-hit from the top of the point frame (cm from point frame)	number	centimeter
DISTANCE TO SOIL	Distance of the pin-hit to the soil (cm above soil)	number	centimeter
OVERALL HEIGHT	Difference between the distance to soil and distance from frame to give actual height of pin-hit (cm)	number	centimeter
SPP	Species or functional group of pin-hit	text
SPP NOTES	Comments about the pin-hit (e.g. stem, dead, etc)	text
STEM THICKNESS	Diameter of stem pin-hits (mm stem)	number	millimeter			#N/A=Missing or Not Measured
LENGTH OF GRAMINOID	Distance to the tip of a graminoid/sedge blade from the point where it was hit with the pin	number	centimeter			#N/A=Missing or Not Measured

	Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.