Phenological stages of deciduous plants were observed at a long term experimental moist acidic tussock tundra site, Arctic LTER 1996 Toolik Lake, AK.

Abstract: 

Phenological stages of deciduous plants were observed at a long term experimental moist acidic tussock tundra site (Arctic LTER) near Toolik Field Station, 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 96gspheg.html and 96gsphsg. html for phenological data on evergreen and sedge species.

Project Keywords: 

Data set ID: 

1416

EML revision ID: 

8

Short name: 

96gsphdc
People

Keywords: 

Arctic LTER keywords: 

Taxa: 

Dates

Date Range: 

Wednesday, May 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.

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 96gsphdc.csv

Phenological stages... File Details

Office spreadsheet icon 96gsphdc.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 = moist acidic tussock
  • 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 EXERTING or BUDS SWELLING
  • Label: 1ST LF EXERTING or BUDS SWELLING
  • Definition: Date of Initial exertion of the first new leaf or Visible green tissue between bud scales
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
LVS EXPND
  • Label: LVS EXPND
  • Definition: Date of Individual leaves are recognizable
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
INFLOR VIS
  • Label: INFLOR VIS
  • Definition: Date of This year's male or female catkins present OR Flower buds visible
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
FLWRS EXPND
  • Label: FLWRS EXPND
  • Definition: Date of Flowers expanding (petals visible)
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
ANTHESIS
  • Label: ANTHESIS
  • Definition: Date of Shedding pollen
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
LF COLOR CHNG (1ST)
  • Label: LF COLOR CHNG (1ST)
  • Definition: Date of Margins of any leaves turn reddish brown
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
LF COLOR CHNG (LST)
  • Label: LF COLOR CHNG (LST)
  • Definition: Date of All of the leaves have begun turning reddish brown
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • #N/A = Missing or Not Measured
NEW SHT LNGTH
  • Label: NEW SHT LNGTH
  • Definition: Length of this years stem growth
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
LNGST LF LNGTH
  • Label: LNGST LF LNGTH
  • Definition: Length of the longest leaf (including petiole) on new stem
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified