Nitrogen mineralization was determined on Arctic LTERToolik and Sag River tussock tundra using the buried bag method, Toolik Field Station, Alaska, Arctic LTER 1989-2013.

Abstract: 

Nitrogen mineralization was determined on LTER and Sag River tussock tundra using the buried bag method. Yearly bags have been deployed every August since 1990.

Project Keywords: 

Data set ID: 

1428

EML revision ID: 

11

Short name: 

1986_to_presentgsbbag

DOI: 

10.6073/pasta/79e01a508bb9021e265eec2a8201b2f9
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Thursday, August 15, 1996 to Friday, August 18, 2006

Publication Date: 

Sunday, January 1, 2006

Methods: 

Paired cores (within 15 cm of each other and 5.95cm diameter) of moss dominated inter-tussock were taken from Tussock tundra in the Arctic LTER site near Toolik Lake AK and in tussock tundra near the Sag River DOT maintenance Camp 25 miles Northeast of Toolik. Core length was measured in the field. Live plant material and mineral soil were removed. One core was placed in a polyethylene bag, inserted back in the hole, covered with moss, and flagged. Cores were incubated one year. The other core was taken back to lab for analysis. This core was used as an initial for the bagged core. For NH4-N and NO3-N extractions 100 mls of KCl (2 N KCl) is added to about 20 grams wet weight of homogenized soil. For PO4-P 100 mls of 0.025 N HCl was used for extraction. KCl extracts were shaken for 4 hours while HCl extracts were shaken for only 5 minutes. All extracts were immediately filtered through Whatman No. 42 filter paper. At the Tussock Site 2 bags per block and at the Sag 4 bags per plot were deployed with initials being collected at the same time. Cores were 5.95 cm in diameter and include organic soil only, i.e., no mineral or green, live plants. Notes: This file is complied from the individual year files. Each year's initials are complied in 1986_to_currentgsext.dat. Phosphorus in buried bags was not measured every year.

Sites sampled.

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Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Date
  • Label: Date
  • Definition: date of collection
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Location
  • Label: Location
  • Definition: Location of site; Sag or Toolik.
  • Type: Nominal
  • Missing values: None specified
Site
  • Label: Site
  • Definition: Landscape toposequence Site number for Sag; for Toolik same as block number
  • Type: Nominal
  • Missing values: None specified
Block
  • Label: Block
  • Definition: Block number for Toolik; plot number for Sag.
  • Type: Nominal
  • Missing values: None specified
Rep
  • Label: Rep
  • Definition: Replicate number for core.
  • Type: Nominal
  • Missing values: None specified
Treatment
  • Label: Treatment
  • Definition: Plot treatment.
  • Type: Nominal
  • Missing values: None specified
Moisture
  • Label: Moisture
  • Definition: Soil moisture calculated from core on per cent mass basis.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
BulkDensity
  • Label: BulkDensity
  • Definition: Bulk Density of core
  • Type: Physical quantity
  • Unit: gramPerCentimeterCubed
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Length
  • Label: Length
  • Definition: the length of the core determined by measuring the core hole (excluding plants)
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlNH4Nug_g
  • Label: dlNH4Nug_g
  • Definition: difference (delta) between previous initial NH4-N extract and bagged NH4-N extract
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlNO3Nug_g
  • Label: dlNO3Nug_g
  • Definition: difference (delta) between previous initial NO3-N extract and bagged NO3-N extract
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlTNug_g
  • Label: dlTNug_g
  • Definition: total delta N = delta NO3 ug/g + delta NH4
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlPO4Pug_g
  • Label: dlPO4Pug_g
  • Definition: difference (delta) between previous initial PO4-P extract and bagged PO4-P extract
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlNH4Ng_m2
  • Label: dlNH4Ng_m2
  • Definition: dlNH4Nug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlNO3Ng_m2
  • Label: dlNO3Ng_m2
  • Definition: dlNO3Nug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlTNg_m2
  • Label: dlTNg_m2
  • Definition: dlNH4Ng_m2 + dlNO3Ng_m2
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
dlPO4Pg_m2
  • Label: dlPO4Pg_m2
  • Definition: dlPO4P4ug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
COMMENTS
  • Label: COMMENTS
  • Definition: notes and comments about the data
  • Type: Nominal
  • Missing values: None specified