Phenological stages of sedges were observed at a long term experimental moist tussock tundra site and a long-term experimental wet sedge tundra sites (Arctic LTER) for 1996 near Toolik Lake, AK.

Abstract: 

Phenological stages of sedges were observed at a long term experimental moist tussock tundra site and a long-term experimental wet sedge tundra sites near Toolik Lake, AK. Also, ITEX maximum growth measurements were recorded on August 19th (moist tussock tundra). Experimental treatments at each site included factorial NxP, greenhouse and shadehouse and were begun in 1989. See 96gsphdc.html and 96gsphsg.html for phenological data on deciduous and evergeen species.

Project Keywords: 

Data set ID: 

1418

EML revision ID: 

13

Short name: 

96gsphsg
People

Keywords: 

Arctic LTER keywords: 

Taxa: 

Dates

Date Range: 

Saturday, June 1, 1996 to Sunday, September 1, 1996

Publication Date: 

Saturday, December 12, 1998

Methods: 

Plots were setup as indicated below, with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) . Greenhouses and shadehouses were annually set up in early June and removed in the end of August
Sites:
Moist Tussock Tundra
Blocks 1-4 (CT, N, P, NP, GH, GHNP, Shade, and ShadeNP treatments)
Treatments began summer of 1989; one 5x20m
plot/treatment
Wet Sedge
Block 1 - Toolik Inlet (CT, N, P, NP, GH, GHNP, and Shade treatments)
Indicated as "Block 1"
Treatments began summer of 1989; one 5x10m
plot/treatment
Block 2 - Toolik Outlet (Same treatments)
"Block 2"
Treatments began summer of 1989; one 5x10m
plot/treatment

Notes: The longest leaf was not measured in the wet sedge plot on the plants monitored for phenology. Snow covered the site before measurements were made. See 96gsgrow.dat for leaf length for Carex rotundata and Eriophorum angustifolium.

Calculations: No calculations, all data in date format.

Sampling Description.

Moist Tussock Tundra: Betula nana, Ledum palustre, Vaccinium vitis-idaea, Carex bigelowii, and Rubus chamaemorus. Three groups of individuals of each species were randomly selected within each plot. An individual of each species was tagged and used as the center of a 15cm radius monitoring circle. The monitoring area for C. bigelowii was a 50cm circle, due to its relative rarity in the plots. Individuals 1-3 were in Block 1, 4-6 in Block 2, etc. Plots were visited every 2-5 days and the dates in which phenological stages occurred were noted. New stem growth of Betula, Ledum, and Vaccinium was defined as the distance between last years bud scar and the tip of the apical bud. These measurements were taken on the most apical branch of a randomly selected individual within the monitoring circle. The longest leaf on this year's stem was measured from the base of the petiole to the tip of the blade, for these three species. If an individual of Carex was flowering within the monitoring circle, then the length of the longest leaf of that individual was measured from the top of the leaf sheath to the tip of the blade. The inflorescence culm was also measured from the top of the leaf sheath to the tip of the blade. If no individuals were flowering within the monitoring circle, then a randomly selected tiller was measured for leaf length. The longest leaf of a randomly selected Rubus was measured from the point of attachment to the stem to the tip of the central lobe. Measurements of maximum growth were recorded on August 19th.

Wet Sedge Tundra: Eriophorum angustifolium, Carex rotundata, and Carex chordiarhiza. Five groups of individuals of each species were randomly selected in each plot. Pin flags were used as the center of the 1m radius monitoring circles. Individuals marked 1-5 were in Block 1 and those marked 6-10 were in Block 2. Plots were visited every 2-5 days and the dates in which phenological stages occurred were noted. The distance from the top of the leaf sheath to the tip of the longest leaf and to the tip of the inflorescence were measured on randomly selected individuals within the monitoring circles.

Notes: The longest leaf was not measured in the wet sedge plot on the plants monitored for phenology. Snow covered the site before measurements were made.

See Methods section.

Sites sampled.

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

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

File 96gsphsg.csv

Phenological stages... File Details

Office spreadsheet icon 96gsphsg.xls

Excel file with... 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 sampled.
  • Type: Nominal
  • Missing values: None specified
SITE
  • Label: SITE
  • Definition: Sites of monitoring TUS = tussock WS = wet sedge
  • Type: Nominal
  • Missing values: None specified
BLCK
  • Label: BLCK
  • Definition: Block number that the sample was observed
  • Type: Nominal
  • Missing values: None specified
TRT
  • Label: TRT
  • Definition: Experimental treatment
  • Type: Nominal
  • Missing values: None specified
SMPL#
  • Label: SMPL#
  • Definition: The sampling number of the individual
  • Type: Nominal
  • Missing values: None specified
1ST LF EXERTED
  • Label: 1ST LF EXERTED
  • Definition: Date of First new leaf exerted
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
INF CULM ELONG
  • Label: INF CULM ELONG
  • Definition: Date of Inflorescence culm elongation
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
ANTHESIS
  • Label: ANTHESIS
  • Definition: Date ofShedding pollen
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
SEED SHEDDING
  • Label: SEED SHEDDING
  • Definition: Date of Seed Shedding
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
LNGST LF LNGTH
  • Label: LNGST LF LNGTH
  • Definition: Length of the longest new leaf on Aug 19th
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
INF CULM LNGTH
  • Label: INF CULM LNGTH
  • Definition: Length of the inflorescence culm on Aug 19th
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured