Growth data was collected on four graminoid species on Arctic LTER experimental plots in moist acidic tussock and dry heath tundra 2004, Toolik Field Station, Alaska.

Abstract: 

Weekly growth of plant species of three growth forms were measured in the ninth year of a long-term experiment at Toolik Field Station. The experimental treatments excluded small and large mammalian herbivores and increased soil nutrients in two arctic Alaskan tundra communities: moist acidic tussock and dry heath. This data set reports the four graminoid (both tussock and rhizomatous forms) species. Please see 2004lggrbnan for Betula nana (dwarf shrub) growth data.

Project Keywords: 

Data set ID: 

10021

EML revision ID: 

8

Short name: 

2004lggrgram
People

Keywords: 

Arctic LTER keywords: 

Taxa: 

Dates

Date Range: 

Monday, June 14, 2004 to Wednesday, August 4, 2004

Publication Date: 

Friday, December 12, 2008

Methods: 

The LTER moist acidic tussock (MAT) site was set up in 1989. The experimental design is four blocks of 5 x 20 meter plots with randomly assigned treatments within each block. Treatments include control (CT), nitrogen (N), phosphorus (P) and nitrogen plus phosphorus (NP). Fertilizer is added annually following snowmelt in June as 10 g/m2 nitrogen (as NH4NO3) and 5 g/m2 phosphorus (as triple superphosphate). Exclosure plots were set up at the MAT site in July 1996 on extra 5 x 20 meter plots within the four-block design of the 1989 LTER acidic tussock experimental plots. On each plot a 5 x 10 meter section was fenced with large mesh (4-inch square mesh) and within this fence a 5 x 5 meter plot was fenced with a small mesh (1/2-inch square mesh). In each block two fenced plots were set up: a plot with no fertilizer and a plot with annual fertilization treatments as described above. Thus the treatments created are no fence, no fertilization (NFCT); small mesh fence, no fertilization (SFCT); large mesh fence, no fertilizer (LFCT); no fence, N plus P (NFNP); small mesh fence, N plus P (SFNP); and large mesh fence, N plus P (LFNP). Only plant species in NFCT, NFNP, SFCT, and SFNP were measured in 2004. The LTER dry heath (DH) site was also established in 1989 using the same methods at MAT in three block replicates. Exclosure plots were set up in 1996 using the same methods at MAT. The same plots were also used in plant species measurement in 2004.

Reference citations:
Gough, L., E.A. Ramsey, and D.R. Johnson. 2007. Plant-herbivore interactions in Alaskan arctic tundra change with soil nutrient availability. Oikos. 116: 407-418.

Sampling description:
Three individual plants of each of two graminoid species in each plot in each community were selected and tagged early in the 2004 field season. Measurements were determined based on that species growth form. The two tussock-forming graminoids had six non-flowering tillers on each tussock tagged individually. At each sampling date, the length of each leaf within each tagged tiller was recorded, along with the number of flowers per tussock. Individual non-flowering ramets of the two rhizomatous graminoids were assessed by measuring length of each leaf within the ramet at each sampling date, and examing ramets for flowering. Sampling was conducted weekly, beginning 14 Jule 2004 at MAT and 16 June 2004 at DH.

Notes:
Cells where there are no values zeros are used.
If seed dispersal was not recorded, cells are marked with N/A.
For INFL #, values reported are for tussock-forming graminoids only; if no values were recorded, cells are marked with N/A.
For INFL Pres, Y or N are reported for rhizomatous-forming graminoids only; if presence was not noted on original data sheets, cells are marked with N/A.
If AVG HT was not recorded, cells are marked with #N/A.

Sites sampled.

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

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy

To cite this data set see the citation example on the LTER Network Data Portal page for this data set.

Office spreadsheet icon 2004lggrgram.xls

Excel file with... File Details

File 2004lggrgram.csv

Growth data was... File Details

Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Species
  • Label: Species
  • Definition: Plant species measured.
  • Type: Nominal
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Dates the leaf was measured.
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Site
  • Label: Site
  • Definition: The site of growth measurement.
  • Type: Code list
  • Codes:
    • MAT = Moist Acidic Tussock | DH=Dry Heath
  • Missing values: None specified
Block
  • Label: Block
  • Definition: The treatment block number
  • Type: Nominal
  • Missing values: None specified
Treatment
  • Label: Treatment
  • Definition: The manipulated treatment.
  • Type: Nominal
  • Missing values: None specified
Plant
  • Label: Plant
  • Definition: The individual plant measured.
  • Type: Nominal
  • Missing values: None specified
Tiller #
  • Label: Tiller #
  • Definition: The individual tiller tagged on tussock-forming graminoids.
  • Type: Nominal
  • Missing values: None specified
LF1T
  • Label: LF1T
  • Definition: The total length of leaf number 1
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
LF2T
  • Label: LF2T
  • Definition: The total length of leaf number 2
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
LF3T
  • Label: LF3T
  • Definition: The total length of leaf number 3
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
LF4T
  • Label: LF4T
  • Definition: The total length of leaf number 4
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
LF5T
  • Label: LF5T
  • Definition: The total length of leaf number 5
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
DISP?
  • Label: DISP?
  • Definition: Indicates dispersal of seeds
  • Type: Nominal
  • Missing values: None specified
INFL #
  • Label: INFL #
  • Definition: Number of flowers per tussock-forming graminoids
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
INFL Pres
  • Label: INFL Pres
  • Definition: Presence of flowers on rhizomatous graminoids
  • Type: Nominal
  • Missing values: None specified
AVG HT
  • Label: AVG HT
  • Definition: The average height of individual plant
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Herbivore Damage
  • Label: Herbivore Damage
  • Definition: The percentage of type of damage
  • Type: Nominal
  • Missing values: None specified