2010 thaw depth and soil temperature in LTER moist acidic tundra experimental plots

Abstract: 

In 2010, thaw depth and soil temperature were measured throughout the growing season in control and fertilized plots in the Arctic LTER's moist acidic tundra sites.

Project Keywords: 

Data set ID: 

10488

EML revision ID: 

5

Short name: 

2010_MAT_SoilThawTemp_lg

DOI: 

10.6073/pasta/63802
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Friday, June 4, 2010 to Wednesday, September 1, 2010

Publication Date: 

Wednesday, December 12, 2012

Methods: 

The LTER moist acidic tussock (Toolik 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 phosphorous (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 5x5-meter plot was fenced with a small mesh (1/2-inch square mesh). In each block two fenced plots were setup: a plot with no fertilizer and a plot with annual fertilization treatments as described above. Thus the treatments created are no fence, no fertilizer (NFCT); small mesh fence, no fertilizer (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). In 2006, a new set of experimental treatments were established in MAT near the earlier plots described above. These include a gradient of fertilization treatments that receive nitrate or ammonium alone, or receive N and P additions with 0.5, 1, 2, 5, or 10 g N added with half of that amount added as P. Only Blocks 1-3 of the 2006 plots were sampled.

For this dataset, only the CT and NP plots were sampled in each of the three sets of experiments (set up in 1989, 1996, and 2006). The 1996 NP plots are the NFNP plots described above, and the 2006 NP plots are the 10gN plots (F10) described above.
Calculations: none Sampling Description. On each sampling date, a metal thaw depth probe with centimeter increments was inserted in 3-5 random locations within each plot. Once the probe hit permafrost, the value for depth of thaw was recorded. Immediately adjacent to this sampling, a hand-held soil thermometer was inserted to a depth of 5 cm and the temperature was recorded. If thaw exceeded 10 cm, a second soil temperature measurement was made at 10 cm depth.

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.

Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Date
  • Label: Date
  • Definition: The date of measurement.
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Site
  • Label: Site
  • Definition: The site of measurement
  • Type: Nominal
  • Missing values: None specified
Treatment start year
  • Label: Treatment start year
  • Definition: The year the treatment began
  • Type: Date/time
  • Date format: yyyy
  • Missing values: None specified
Block
  • Label: Block
  • Definition: The treatment block number
  • Type: Nominal
  • Missing values: None specified
Treatment
  • Label: Treatment
  • Definition: The treatment imposed
  • Type: Nominal
  • Missing values: None specified
ThawDepth1
  • Label: ThawDepth1
  • Definition: depth to permafrost
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
SoilTemp1_5cm
  • Label: SoilTemp1_5cm
  • Definition: temperature at 5 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp1_10cm
  • Label: SoilTemp1_10cm
  • Definition: temperature at 10 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
ThawDepth2
  • Label: ThawDepth2
  • Definition: depth to permafrost
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp2_5cm
  • Label: SoilTemp2_5cm
  • Definition: temperature at 5 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp2_10cm
  • Label: SoilTemp2_10cm
  • Definition: temperature at 10 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
ThawDepth3
  • Label: ThawDepth3
  • Definition: depth to permafrost
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp3_5cm
  • Label: SoilTemp3_5cm
  • Definition: temperature at 5 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp3_10cm
  • Label: SoilTemp3_10cm
  • Definition: temperature at 10 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
ThawDepth4
  • Label: ThawDepth4
  • Definition: depth to permafrost
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp4_5cm
  • Label: SoilTemp4_5cm
  • Definition: temperature at 5 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp4_10cm
  • Label: SoilTemp4_10cm
  • Definition: temperature at 10 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
ThawDepth5
  • Label: ThawDepth5
  • Definition: depth to permafrost
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp5_5cm
  • Label: SoilTemp5_5cm
  • Definition: temperature at 5 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
SoilTemp5_10cm
  • Label: SoilTemp5_10cm
  • Definition: temperature at 10 cm depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured