Percent species cover from 14 flux canopy and 19 point frame 1m x 1m plots sampled near the shrub LTER sites at Toolik Field Station, Alaska, summer 2012.

Abstract: 

Total and individual subsample species percent cover data for all plots where flux or point frame measurements were made in 2012 IVO the LTER Shrub vegetation plots at Toolik Field Station. All plots sampled were dominated either by B. nana or S. pulchra canopies. Cover estimates were made for the five most dominate functional groups using a 1m x 1m grid with 20cm2 blocks with each square representing four percent of the total area. Percentages represent absolute cover so do not sum to 100%.

Project Keywords: 

Data set ID: 

10148

EML revision ID: 

8

Short name: 

2012_GS_ITEX_PercentCover
People

Keywords: 

Arctic LTER keywords: 

Taxa: 

Dates

Date Range: 

Saturday, June 23, 2012 to Tuesday, August 7, 2012

Publication Date: 

Thursday, December 12, 2013

Methods: 

PERCENT COVER METHOD
Total and individual subsample species percent cover data for all plots where flux or point frame measurements were made in 2012 IVO the LTER Shrub vegetation plots at Toolik Field Station. All plots sampled were dominated either by B. nana or S. pulchra canopies. Locations were preferentially chosen to represent tall shrub canopies (height > 70 cm) and to avoid the edge of vegetation stands or locations where the canopy appeared unhealthy, trampled, or patchy.

We split the 1m x 1m plots into 25 sub plots using a grid, then estimated percent cover of the five most common functional groups/species in each of the sub plots individually and then summed the percentage from each plot (representing 4% total cover) to obtain the total cover by functional group/species. For each measurement, at least two field technicians performed the estimates by species; the value recorded was the average of the two (or more) estimates. The total vascular plant cover for the entire plot is the sum of all species cover percentages; the total plant cover is the vascular plant cover plus moss cover. Percentages represent absolute cover, and thus they do not sum to 100%

Each spp is assigned a 6 letter code; the first 3 letters of genus and species name. SPP indicates the species is not known.

Where many graminoids were growing together it was often impossible to judge the individual percentages, so only the total for the growth form is given; the main species present are listed in the notes column.

The species or functional groups identified in the 1m x 1m point frame and chamber flux plots are are coded to match those collected by ITEX harvest plots from 2003 - 2009 as defined here:

SPECIES | CODE | FUNCTIONAL GROUP | COMMENTS
Betula nana | BET NAN | D |
Forb | FORB | F |
Grass or sedge - unidentified | GRAMMINOID | GRM |
Ledum palustre | LED PAL | E |
Moss - unidentified |MOSS |B |
Pedicularis species | PED SPP | F |
Potentilla species | POT SPP | F |
Salix glauca | SAL GLA | D |
Salix pulchra | SAL PUL |D |
Salix reticulata | SAL RET | D |net veined willow
Vaccinium vitis-ideae |VAC VIT |E |
Vaccinium uliginosum | VAC ULI | D | bog blueberry

Growth forms (functional groups) are abbreviated as follows:
D = deciduous shrub
E = evergreen shrub
F = forb
GRM = graminoid or sedge
B = bryophyte (mosses and liverworts)

#N/A refers to a value that was not recorded.

Sites sampled.

Download a comma delimited (csv) or Excel file (includes metadata and data sheets).

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Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
YEAR
  • Label: YEAR
  • Definition: year of measurement
  • Type: Date/time
  • Date format: YYYY
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Date of Measurement
  • Type: Date/time
  • Date format: dd-mmm-yy
  • Missing values: None specified
SITE
  • Label: SITE
  • Definition: Toolik
  • Type: Nominal
  • Missing values: None specified
GROUP
  • Label: GROUP
  • Definition: Measurement location in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 = Upland, IVO Block 2 = Outlet
  • Type: Nominal
  • Missing values: None specified
PLOT
  • Label: PLOT
  • Definition: Individual plot identifier
  • Type: Nominal
  • Missing values: None specified
TREAT
  • Label: TREAT
  • Definition: none or fertilized (FERT - Fertilized with 10g N + 5g P per square meter. N is in form of NH4NO3 annually)
  • Type: Nominal
  • Missing values: None specified
PHASE
  • Label: PHASE
  • Definition: Measurement series (round of measurement within each year) #not used in this data collection
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
PLOT SIZE
  • Label: PLOT SIZE
  • Definition: 1m x 1m chamber or point frame size
  • Type: Nominal
  • Missing values: None specified
SPECIES CODE
  • Label: SPECIES CODE
  • Definition: species abbreviation
  • Type: Nominal
  • Missing values: None specified
FUNCT GROUP
  • Label: FUNCT GROUP
  • Definition: functional group classification
  • Type: Nominal
  • Missing values: None specified
SPP PERCENT COVER
  • Label: SPP PERCENT COVER
  • Definition: percent cover of specific species
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
DOM VEG
  • Label: DOM VEG
  • Definition: Dominant canopy vegetation
  • Type: Nominal
  • Missing values: None specified
Total vascular plant cover percent cover
  • Label: Total vascular plant cover percent cover
  • Definition: percent vascular plant cover (sum ofall SPP except moss) for the plot
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Total plant cover
  • Label: Total plant cover
  • Definition: total plant percent cover (including moss) for the plot
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured