Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts, Arctic LTER 1987 to 2002

Abstract: 

Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts. This file complies data collected at different times from 1987 through 2001 and includes initial extracts taken for buried bag method of net nitrogen mineralization.

Project Keywords: 

Data set ID: 

1429

EML revision ID: 

11

Short name: 

1987_2002gsext
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Tuesday, June 2, 1987 to Friday, August 15, 2003

Publication Date: 

Monday, December 12, 2005

Methods: 

Cores (5.95cm diameter) were taken at various communities near Toolik Lake and at the toposequence at the Sagavanirktuk River. Some cores were from experimental plots: i.e. plots treated with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) and with greenhouses and shadehouses, annually set up in late May or early June and removed at the end of August or early September.. Cores from the tussock communities were taken in moss dominated intertussock spaces. The cores were separated into organic (O) and mineral horizons (B), with corresponding lengths recorded directly from the core hole. For NH4-N and NO3-N extractions 100mls of 2N KCl was added to approximately 20g wet set homogenized soil. A 0.025N HCl solution was used to access plant available PO4-P. KCl extracts were shaken for 2 hours and weak HCl extracts for 5 minutes. All extracts were immediately filtered through Whatman No. 42 filter paper. PO4-P and NH4-N extractions were hand run on a spectrophotometer (following LTER protocol) using an 5 or 1cm cell or were run on an autoanalyzer at Toolik. NO3-N extractions were either run on an autoanalyzer at Toolik or frozen and run on an autoanalyzer following LTER protocol in the fall at Woods Hole, MA.

Notes: This file contains all data from the analysis, including bulk density and soil moisture calculations. See variable comments for notes on the different extractions.

Sites sampled.

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

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File 1987_2002gsext.csv

Plant available NH4,... File Details

Office spreadsheet icon 1987_2002gsext.xls

Excel file with... File Details

Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Location
  • Label: Location
  • Definition: Location of plots.
  • Type: Nominal
  • Missing values: None specified
Month
  • Label: Month
  • Definition: Month sampled.
  • Type: Nominal
  • Missing values: None specified
Year
  • Label: Year
  • Definition: Year sampled.
  • Type: Nominal
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Sampling date in
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Core No
  • Label: Core No
  • Definition: Lab number for core.
  • Type: Nominal
  • Missing values: None specified
Type
  • Label: Type
  • Definition: Type of cores, i.e. initial for buried bags or regular extracts.
  • Type: Nominal
  • Missing values: None specified
Site:
  • Label: Site:
  • Definition: Site core is from.
  • Type: Nominal
  • Missing values: None specified
Treatment
  • Label: Treatment
  • Definition: Community or treatment plot core is from.
  • Type: Nominal
  • Missing values: None specified
Block
  • Label: Block
  • Definition: Block number is aplicable.
  • Type: Nominal
  • Missing values: None specified
Rep
  • Label: Rep
  • Definition: Replicate number.
  • Type: Nominal
  • Missing values: None specified
Horizon
  • Label: Horizon
  • Definition: Horizon core is from.
  • Type: Nominal
  • Missing values: None specified
Core Dia
  • Label: Core Dia
  • Definition: Diameter of core.
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
CAN#
  • Label: CAN#
  • Definition: soil moisture can number
  • Type: Nominal
  • Missing values: None specified
Canwt
  • Label: Canwt
  • Definition: Empty can weight (tare)
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Wetwt
  • Label: Wetwt
  • Definition: Wet soil plus can weight
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Drywt
  • Label: Drywt
  • Definition: Can + soil weight after being oven dried at 60 degree C
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
KClwt
  • Label: KClwt
  • Definition: Weight of soil used for KCl extraction
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
HClwt
  • Label: HClwt
  • Definition: Weight of soil used for weak HCl extraction
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
MOISTURE
  • Label: MOISTURE
  • Definition: ((wetcan -drycan)/(drycan-canwt))*100
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Corwetwt
  • Label: Corwetwt
  • Definition: Core wet wt is (weight of entire core -rock weight)
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Core area
  • Label: Core area
  • Definition: Area of core
  • Type: Physical quantity
  • Unit: centimeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
BulkDens
  • Label: BulkDens
  • Definition: core wt wet *(drywt-canwt)/(wetwt-canwt)/(volume in cm3). Volume= pi * 2.73 (the radius in cm) ^2 * length
  • Type: Physical quantity
  • Unit: gramPerCentimeterCubed
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
Wet_Dry
  • Label: Wet_Dry
  • Definition: (drywt-canwt)/(wetwt-canwt)
  • Type: Physical quantity
  • Unit: dimensionless
  • 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 (cm) determined by measuring the hole (excluding plants) from which the core came
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NH4N um
  • Label: NH4N um
  • Definition: micromoles per liter NH4-N in 100 mls 2N KCl extract shaken for 4 hrs
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NO3N um
  • Label: NO3N um
  • Definition: micromoles per liter NO3-N in 100 mls 2N KCl extract shaken for 4 hrs
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
PO4P um
  • Label: PO4P um
  • Definition: micromoles per liter PO4-P in 100 mls .025 N HCl extract shaken for 5 min
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NH4blank
  • Label: NH4blank
  • Definition: um/l KCl blank correction for NH4 concentration.
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NO3blank
  • Label: NO3blank
  • Definition: um/l KCl blank correction for NO3 concentration.
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
PO4blank
  • Label: PO4blank
  • Definition: um/l HCl blank correction for weak PO4 concentration.
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NH4N ug_g
  • Label: NH4N ug_g
  • Definition: ((NH4N um/l - NH4blank)*100ml*(1L/1000ml)/(KClwt*wet_dry)*14(ug/mole)
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NO3N ug_g
  • Label: NO3N ug_g
  • Definition: ((NO3 um/l-NO3blank)*100ml*(1L/1000ml))/(KClwt*wet_dry)*14(ug/mole)
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
PO4P ug_g
  • Label: PO4P ug_g
  • Definition: ((PO4 um/l - PO4blank)*100ml*(1L/1000ml)/(HClwt*wet_dry)*31(ug/mole)
  • Type: Physical quantity
  • Unit: microgramPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NH4N g_m2
  • Label: NH4N g_m2
  • Definition: (NH4 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
NO3N g/m2
  • Label: NO3N g/m2
  • Definition: (NO3 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug
  • Type: Physical quantity
  • Unit: gramPerMeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • #N/A = Missing or Not Measured
PO4 g/m2
  • Label: PO4 g/m2
  • Definition: (PO4 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/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