Conditions of Use
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.
5 ) 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.
6 ) 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.
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.
|Dataset URLs:||METADATA: HTML, Rich Text, XML(EML compliant) |
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Poral
|Dataset Title:||Plant % cover by functional type for the ITEX CO2 flux survey plots at Toolik, Alaska; Abisko, Sweden; Svalbard, Norway; Zackenberg, Northeast Greenland; Anaktuvuk River Burn, Alaska and Barrow, Alaska 2003-2009.|
|Investigator 1:|| |
|Organization:||The Ecosystems Center|
|Address line 2:||Marine Biological Laboratory|
|Address line 3:||7 MBL Street|
|Investigator 2:|| |
|Last Name:||van Wijk|
|Address line 2:|
|Address line 3:|
|Investigator 3:|| |
|Investigator 4:|| |
|Investigator 5:|| |
|Investigator 6:|| |
|Investigator 7:|| |
|Investigator 8:|| |
|Investigator 9:|| |
|Investigator 10:|| |
|Investigator 11:|| |
|Investigator 12:|| |
|Investigator 13:|| |
|Investigator 14:|| |
|Last Name:||van Buuren|
|Investigator 15:|| |
|Investigator 16:|| |
|Investigator 17:|| |
|Keywords:||plant cover, plant functional type, populations|
|Abstract:||Estimated aerial plant % cover by functional type in flux plots measured during the ITEX cirumarctic flux survey 2004-2006. Survey plots were located in the Toolik Lake LTER fertilization experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; in the Zackenberg valley, Northeast Greenland; at BEO near Barrow, Alaska and at the Anaktuvuk River Burn in Alaska. Measurements were made during the growing seasons 2003 to 2009.|
|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
Online URL: http://ecosystems.mbl.edu/ARC/
|DATA FILE INFORMATION:|
|Data File URL||http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1603&urlTail=terrest/tracegas/data/2004-2009gscoverft.csv|
|Data File Name||2004-2009gscoverft.dat|
|Number of Data Records||304|
|Other Files to Reference|
|Availability Status||Type 1|
|Quality Control Information|
|Log of Changes:||Version 1: Checked file and created eml and html files. Feb 2006 Jiml Version 2: Added Zackenberg 2006 cover data and updated metadat.txt with new site description, references, files to reference etc. Added a new identifier column called "plot size" because 2006 data include measurements made on 0.3m x 0.3m plots. Changed date in file name from 2005 to 2006. Oct 2006 LStreet|
|Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.|
|Version 4: Updated LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.|
|Version 5: Added Toolik and Barrow 2009 data. Changed file name from 2006 to 2009. Added column for "unclassified" harvested plant material.|
|Version 6: Updated metadata form and to eml 2.1 JimL Nov2012|
|Version 7: Updated metadata form (with sites sheet). CH March 2013.|
|Version 8: Corrected eml excel file name wrong extension. JimL 16May13|
|Version 9: Corrected Distrubution URL. It had xlsfiles in the path. Jim L 19Jun14|
|Location Name||Toolik||Imnavait Creek||Abisko Stepps||Abisko Paddus||Abisko Latnjajare||Adventdalen Svalbard, Norway||Zackenberg Greenland||Barrow Alaska||Anaktuvuk River Burn||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||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||Toolik Lake (68 degrees 38N, 149 degrees 34W)||Imnavait Creek (68 degrees 37N, 149 degrees 18W) Alaska, U.S.||"Stepps" site (68 degrees 18N, 18 degrees 51E) near Abisko, Sweden.||Paddus (68 degrees 19N, 18 degrees 51E) near Abisko, Sweden.||Latnjajaure (68 degrees 21N, 18 degrees 30E) near Abisko, Sweden.||Adventdalen (78 degrees 13N, 15 degrees 38E) Svalbard, Norway.||Zackenberg research area zone 1a (74º28’ N, 20º34’ W), Northeast Greenland.||Barrow ( 71° 18' N, 156° 36' W) Alaska, USA.||Anaktuvuk River Burn (68° 56-59' N, 150° 12-16' W) Alaska, USA.||Enter Description||Enter Description||Enter Description||Enter Description||Enter Description||Enter Description||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||68.62405||68.6167||68.3||68.3167||68.35||78.2166666666667||74.4666666666667||71.31||68.9||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees|
|Longitude||-149.61058||-149.31||18.85||18.85||18.5||15.6333333333333||-19.4333333333333||-156.6||-150.2||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees||In Decimal Degrees|
|Elevation||719||884||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters||In Meters|
|Link to Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map||View on Google Map|
Imnavait Creek, Alaska 2004: Cover estimates were made once on the 15 flux plots along the topographic sequence of the west facing slope of Imnavait Creek catchment.
Toolik Lake, Alaska 2004: Cover estimates were made once on the 20 flux plots in treatment (N +P) and control blocks of the LTER terrestrial fertilisation experiment at Toolik Lake, including the moist acidic tussock, non-acidic tussock, non acidic non-tussock, inlet wet sedge and heath sites.
Abisko, Sweden 2004. Cover estimates were made once on the 11 plots at the Stepps site, 13 plots at Paddus and 12 plots at Latnjajaure.
Abisko, Sweden 2005. Cover estimates were made on 15 flux plots at the Stepps site each time flux measurements were made (3 times through June/early July and once in mid August).
Svalbard 2005. Cover estimates were made once on 41 flux plots at various sites in Adventdalen.
Zackenberg 2006. Data were collected on 35 1 x 1m plots and 25 0.3 x 0.3m plots across a range of vegetation types. 13 of the 0.3 x 0.3m plots were located within 1m x 1m plots (identified by plot name with suffix "b1, b2 or b3"), the remainder were independant of the 1 x 1m plots (B14-25). Measurements were made from 8 July through 1 Aug 2006.
Toolik, Alaska 2009: Data were collected on nine 1m x 1m plots, three in each vegetation type. Vegetation types included moist acidic tundra (MAT), dry heath (HTH) and wet sedge (WSG). Each plot was measured at approximately 2 weeks intervals from mid-June to mid-August 2009.
Anaktuvuk River Burn, Alaska 2009: Data was collected on five 0.7m x 0.7m flux plots along a burn severity gradient during mid-June 2009.
Barrow, Alaska 2009: Data was collected on thirteen 0.7m 0.7m flux plots along a moisture gradient during late-July to early-August 2009.
EXPERIMENTAL DESIGN AND METHODS
We estimated absolute percent cover by species for each 1m x 1m flux plot (ie total cover can be > 100%). In 2004 we split the flux plot into 25 sub plots using a grid, we then estimated % cover in each of the sub plots individually and calculated an average. In 2005, 2006 and 2009 we used the same 1m x 1m grid but counted running totals of percentages of each species in squares 1 thru 25 (only the total cover for the flux plot is given). For the 0.7m x 0.7m plots we used a smaller version of the same grid. For the 0.3m x 0.3m flux plots we estimated cover once for the plot as a whole.
Each spp is assigned to a growth form, abbreviated as follows:
D = deciduous shrub
E = evergreen shrub
F = forb
G = grass
GRM = graminoid
S = sedge/rush
P = pteridophyte
B = bryophyte (mosses and liverworts)
L = lichen
U = unclassified
W = water
R = rock
X = litter or bare or crust
++ = plus other spp
Where many graminoids were growing together it was often difficult to judge the individual percentages, so only the total for the growth form is given; the main species present are listed in the comments column.
Total vascular cover is the sum of all deciduous, evergreen, forb, grass, sedge, gramnoid and pteridophyte % covers:
TotVasc = D + E + F + G + P + S + GRM
where TotVasc = total absolute vascular cover
D = total deciduous cover
E = total evergreen cover
F = total forb cover
G = total grass cover
P = total pteridophyte cover
S = total sedge cover
GRM = total graminoid cover
The abundance of each growth form as a proportion of the total vascular cover is calculated as (for deciduous vegetation):
Vasc%Decid = (D/TotVasc)*100
where Vasc%Decid = % of total vascular cover which is deciduous
TotVasc = total absolute vascular cover
D = total deciduous cover
COMMENTS: N.B The category GRM is for 'graminoids' i.e. species growing together whose cover could not be estimated separately as grass or sedge. A plot can have 0% GRM cover and 25% grass cover if only grasses are present. To find total graminoid cover for a plot sum G + S + GRM.
FOR MORE INFORMATION CONTACT: Gus Shaver, The Ecosystems Center, Woods Hole, MA, 02543, USA
Bay, C. (1998) Vegetation mapping of Zackenberg Valley Northeast Greenland. Danish Polar Center.
Street, L.E., Shaver, G.R., Williams, M., van Wijk, M.T. (2007) What is the relationship between changes in canopy leaf area and changes in photosynthetic CO2 flux in arctic ecosystems? Journal of Ecology 95: 139-150.
Williams, M., Street, L.E., van Wijk, M.T., and Shaver, G.R. (2006) Identifying Differences in Carbon Exchange among Arctic Ecosystem Types. Ecosystems, 9, 288-304.
|Variable Name||Variable Description||Data Type||Units||DateTime Format||Code Information||Missing Value Code|
|YEAR||Year of percent cover measurement||datetime||YYYY|
|DATE||Date of percent cover measurement||datetime||DD-MMM-YY|
|SITE||Abisko, Toolik, Svalbard or Zackenberg||text|
|GROUP||Location of flux plots at each site||text|
|TREAT||Control or fertilised with N and P fertiliser||text|
|PLOT||Individual plot identifier||text|
|PHASE||Measurement series (round of measurement within each year)||text|
|PLOT SIZE||Plot size of 1m x 1m or 0.3m x 0.3m||text|
|B||absolute % cover bryophtes||number||percent||#N/A=Missing or Not Measured|
|D||absolute % cover decidious||number||percent||#N/A=Missing or Not Measured|
|E||absolute % cover evergreen||number||percent||#N/A=Missing or Not Measured|
|F||absolute % cover forbs||number||percent||#N/A=Missing or Not Measured|
|G||absolute % cover grasses||number||percent||#N/A=Missing or Not Measured|
|L||absolute % cover lichens||number||percent||#N/A=Missing or Not Measured|
|P||absolute % cover pteridophytes||number||percent||#N/A=Missing or Not Measured|
|R||absolute % cover rocks||number||percent||#N/A=Missing or Not Measured|
|S||absolute % cover sedges||number||percent||#N/A=Missing or Not Measured|
|GRM||absolute % cover mixed graminoids||number||percent||#N/A=Missing or Not Measured|
|U||absolute % cover unclassified||number||percent||#N/A=Missing or Not Measured|
|W||absolute % standing water||number||percent||#N/A=Missing or Not Measured|
|X||absolute % unclassified||number||percent||#N/A=Missing or Not Measured|
|TotVasc||total absolute vascular cover||number||percent||#N/A=Missing or Not Measured|
|Vasc%Decid||% of total vascular cover which is deciduous||number||percent||#N/A=Missing or Not Measured|
|Vasc%Ever||% of total vascular cover which is evergreen||number||percent||#N/A=Missing or Not Measured|
|Vasc%Forb||% of total vascular cover which is forb||number||percent||#N/A=Missing or Not Measured|
|Vasc%Grass||% of total vascular cover which is grass||number||percent||#N/A=Missing or Not Measured|
|Vasc%Pterid||% of total vascualr cover which is pteridophyte||number||percent||#N/A=Missing or Not Measured|
|Vasc%Sedge||% of total vascular cover which is sedge||number||percent||#N/A=Missing or Not Measured|
|vasc%gram||% of total vascular cover which is graminoid||number||percent||#N/A=Missing or Not Measured|