+------------------------------------------------------------------+
|                             JORNADA LTER                         |
|                      New Mexico State University                 |
|                      Data Set Documentation Form                 |
+------------------------------------------------------------------+
All Jornada Desert Site NSF/LTER data sets must be documented on the
following form. This applies to any data set intended for permanent
archiving.  All raw data sets collected under the auspices of the
Jornada NSF/LTER Program will be described by the following
standardized form. Information that is not available at this time,
must be included when available. For these fields, enter
<NOT AVAILABLE>.  For fields that will not have information, enter
<NONE>. See data manager for any questions regarding this form.
--------------------------------------------------------------------

Dataset ID: DSL2004007
Project ID: PRL2004002

 1) Data set access (RESTRICTED or UNRESTRICTED):
    ---------------------------------------------
    UNRESTRICTED

 2) Data set title:
    ---------------
    Ant nest soil nutrients

 3) Project title:
    --------------
    Effects of harvester ant nests on soil properties and vegetation

 4) Responsible investigator(s):
    ----------------------------
    Rodolfo R. Di Marco, Jun1987

 5) Date data collection commenced (mm/dd/yyyy):
    --------------------------------------------
    24 June 1987

 6) Date data collection terminated (mm/dd/yyyy or ONGOING):
    --------------------------------------------------------
    24 June 1987

 7) Expected duration of study:
    ---------------------------
    one day

 8) Frequency of measurement:
    -------------------------
    once

 9) Researchers: (Personnel who will be obtaining data and who would
                  need to be contacted directly if there is a
                  problem in the raw data):
    ----------------------------------------------------------------
    Rodolfo R. Di Marco, Jun1987

10) Methods of recording (field data sheets, instrumental, etc.):
    ----------------------------------------------------------------
    field data sheets

11) Site location (Describe in sufficient detail that the site can
                   be relocated):
    ----------------------------------------------------------------
    This study was conducted at three sites on the Jornada LTER
    during winter-spring 1987.  A burrograss-tobosa swale grassland
    was site 1, an area dominated by the perennial grasses
    Scleropogon brevifolia (burrograss) and Hilaria mutica (tobosa).
    This area is located 3,000 ft. (1,000 m) SE of the playa bottom
    or playa basin (College Playa) and subject to rare sheet
    flooding.  A playa fringe (College Playa) was site 2, an area
    characterized by scattered Prosopis glandulosa (mesquite) mixed
    with Yucca elata and Larrea tridentata (creosotebush).  The upper
    basin slope was site 3, an area characterized by a fairly uniform
    cover of Xanthocephalum sarothrae (snakeweed) and a high
    diversity of annual forbs and grasses.  The soil series described
    on the watershed by Wierenga et al. (1987) from site 1 to site 3
    are Dalby (Typic Torrerts, fine), Headquarter (Ustollic
    Haplargid, fine loamy), Bucklebar (Typic Haplargid, fine-loamy),
    and Dona Ana (Typic Haplargid, coarse-loamy), respectively.

12) Data set description (State the hypothesis and / or objectives
                         which collection of data set addresses):
    ----------------------------------------------------------------
    The purpose of this investigation was to answer three general
    questions:
    1. How does the modification of soil properties and the ratios of
    resources (e.g., water-N) by ants alter species assemblages of
    winter annual plants at the edge of the ant nests?
    2. How does the "spring cleaning", clipping, predation or
    herbivory by ants affect success of the winter annual plants at
    the edge of ant nests?
    3. Are there significant differences in the floristic assemblage
    and belowground standing crop (root biomass) between the edge of
    ant nest and the surrounding unaffected soils?

    Data set contains chemical analyses for soil samples collected
    from five ant nests for each of the three sites for total
    nitrogen, (ammonium, nitrate), inorganic phosphorus,
    and exchangeable cations (K+, Na+, Ca2+ and Mg2+). Also included
    is below ground biomass from five ant nests for each of the three
    sites.


13) Attributes measured:
    -------------------------------------------------------------------------
    Variable Name
       example: AIRMAX                Name used in data set header.

    Variable Format
       example: C = character         (C3: Three characters [XXX])
                I = integer           (I2: Integer with two places [##])
                F = floating point    (F4.2: Total places with decimal
                                      point = 4, with 2 decimal places.
                                      [#.##])

    Variable Mask
       example: mm/dd/yyyy            Date where mm=month, dd=day, yyyy=year

    Exception Value Codes
       format: [code] = [description]
       example:     'Q' = questionable data
                          Code = code (surrounded by single quotes)
                          Note: Equal signs (=) are used to separate code and
                                description.
                          Note: Enter multiple Exception Value Codes on separate
                                lines.

    Acceptable Value Type
       examples: defined list
                 undefined list
                 range
                 defined list of ranges
                 undefined list of ranges
                 complex
                 external list

    Acceptable Value Codes
       format: [code] = [description]
       example:       C = Creosotebush
                          Code = code
                          Note: Equal signs (=) are used to separate code and
                                description.
                          Note: Enter multiple Exception Value Codes on separate
                                lines.
                                         Note: Equal signs (=) are used to
                                               separate values and commas (,)
                                               are used to separate multiple
                                               value sets. Ranges of acceptable
                                               values are separated by a dashes.
                                               Lists of acceptable values are
                                               separated by commas. Asterick
                                               symbols (*) are reserved to
                                               indicate external lookup file
                                               listing.

    -------------------------------------------------------------------------
             variable name: SAMPLE
     attribute description: Replicate sample analysis
            measured units: N/A
     start column position: 1
           variable format: I1
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: undefined list
    acceptable value codes: 1,2

             variable name: PLACE
     attribute description: Research site
            measured units: N/A
     start column position: 3
           variable format: I1
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: defined list
    acceptable value codes: 1 = burrograss-tobosa swale
                            2 = playa fringe
                            3 = upper basin slope mixed grasses

             variable name: REP
     attribute description: Sample replicate
            measured units: N/A
     start column position: 5
           variable format: I1
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: complex
    acceptable value codes: 1-8 When PLACE=1
                            1-5 When PLACE=2
                            1-7 When PLACE=3

             variable name: TRT
     attribute description: Treatment
            measured units: N/A
     start column position: 7
           variable format: I1
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: defined list
    acceptable value codes: 1 = Ant nest perimeter
                            2 = Reference site

             variable name: NA
     attribute description: Sodium ion, Na+
            measured units: meq/100g
     start column position: 9
           variable format: F4.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: K
     attribute description: Potasium ion, K+
            measured units: meq/100g
     start column position: 14
           variable format: F4.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: CA
     attribute description: Calcium ion, Ca2+
            measured units: meq/100g
     start column position: 19
           variable format: F5.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: MG
     attribute description: Magnesium ion, Mg2+
            measured units: meq/100g
     start column position: 25
           variable format: F4.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: NO3
     attribute description: Nitrate, NO3-N
            measured units: mg/kg soil
     start column position: 30
           variable format: F5.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: NH4
     attribute description: Ammonium, NH4-N
            measured units: mg/kg soil
     start column position: 36
           variable format: F4.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: P
     attribute description: Phosphorus
            measured units: mg/kg soil
     start column position: 41
           variable format: F5.2
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: PP
     attribute description: Potasium in phosphate, PO4-P
            measured units: mg/kg soil
     start column position: 47
           variable format: F5.3
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: TN
     attribute description: Total nitrogen
            measured units: mg/kg soil
     start column position: 53
           variable format: I4
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

             variable name: BIO
     attribute description: below ground biomass
            measured units: g/1000cm3
     start column position: 58
           variable format: F5.3
             variable mask: N/A
     exception value codes: N/A
     acceptable value type: N/A
    acceptable value codes: N/A

14) Methodology (Provide sufficient detail such that an unaware
                reader could repeat the described data collection
                procedures.)
    ----------------------------------------------------------------
       On 24 June 1987, soil samples were collected from five ant
    nests for each of the three sites for analysis of total nitrogen,
    (ammonium, nitrite, nitrate), inorganic phosphorus, and
    exchangeable cations (K+, Na+, Ca2+ and Mg2+).  The two quadrats
    of the ant nest edges were randomly sampled once with a 400-cm3
    core (20 cm depth) and the soil samples were mixed together.  The
    same procedures were used for the two quadrats of adjacent
    reference sites.
       All chemical analyses were determined on the < 2-mm soil
    fraction.  Total nitrogen was measured by microKjeldahl digestion
    (Bremmer & Mulvaney, 1982) and analyzed twice.  Ammonium (NH4-N),
    nitrite (NO3-N), and nitrate (NO3-N) were extracted with 100 ml of
    2 N KCl on 10-g soil samples and were measured as described by
    Keeney and Nelson (1982).  Inorganic phosphorus (P) was extracted
    with 100 ml of 0.5 M NaHCO3 on approximately 10-g soil samples and
    was measured on an autoanalyzer.  Exchangeable cations (K+, Na+,
    Ca2+ and Mg2+) were extracted with 1 N ammonium acetate (pH 7.0)
    and were analyzed with an atomic absorption spectrophotometer.
       On 24 June 1987, below ground biomass was measured at only
    five ant nests from each of the three sites.  A 400 cm3 soil core
    sample was taken from each quadrat (edges and reference).  Roots
    were cleaned with a 2-mm sieve, oven-dried for 72 hours at 60 C
    and carefully weighed.

15) Key literature (Citations that describe sampling procedures,
                    [reference of a published paper, thesis, etc.]):
    ----------------------------------------------------------------
    Bremmer, J.M. and C.S. Mulvaney. 1982. Total nitrogen. In: A.L.
    Page, R.H. Miller, and D.R. Keeney, editors. Methods of soil
    analysis. Part 2. Chemical and microbiological properties. Second
    edition. American Society of Agronomy. Soil Science Society of
    America, Madison, Wisconsin.

    Keeney, D.R. and D.W. Nelson. 1982. Nitrogen-inorganic forms.
    Pages 643-698. In: A.L. Page, R.H. Miller, and D.R. Keeney,
    editors. Methods of soil analysis. Part 2. Chemical and
    microbiological properties. Second edition. American Society of
    Agronomy. Soil Science Society of America, Madison, Wisconsin.

16) Keywords (keywords that describe data set; maximum of 10):
    ----------------------------------------------------------------
    ants, soil nutrients, annual plants

17) Treatment of data: (List any programs used in analysis of the data):
    [Note: Programs should be appended and stored with this form.]
    ----------------------------------------------------------------
    <NONE>

18) Associated computer accounts:
    ----------------------------------------------------------------
    <NONE>

19) Files associated with this data set:
    -------------------------------------------------------------------------
    File Type Codes:
             Type
             Code  Definition
             ----  ----------
             MD    Metadata files
             DS    Data files
             DE    Data entry, verification, and analysis files
             OT    Other (Any other related files)

    File Format Codes: ASCII, BINARY

    ------Metadata files------------------------------------
      file type: MD
      file name: ANTNESTS.PRJ
    description: Project documentation
    file format: Text file
    format type: ASCII

      file type: MD
      file name: ANSNUTR.DSD
    description: Data set documentation
    file format: Text file
    format type: ASCII

    ------Data files----------------------------------------
      file type: DS
      file name: ANSNUTR.DAT
    description: Data set file
    file format: Text file
    format type: ASCII

    ------Data entry, verification, and analysis files------
      file type: DE
      file name: B3.SAS
    description: SAS analysis file including raw data set
    file format: Text file
    format type: ASCII

      file type: DE
      file name: PROG3.SAS
    description: SAS analysis file
    file format: Text file
    format type: ASCII

    ------Other (Any other related files)-------------------
      file type: OT
      file name: Readme.txt
    description: General information file
    file format: Text file
    format type: ASCII

20) Comments (Include any comments here that more fully describe
               this data set):
    ----------------------------------------------------------------
    No documentation was completed by the investigator.  Project and
    data set documentation was completed by the LTER Data Manager
    with information obtained from Di Marco (1987) and header infor-
    mation from SAS files which also contained the data.  The raw
    data which composes this data set was extracted from provided SAS
    files prior to analyses.  No units given for Phosphorus; however,
    based on units of measure for similar analyses in this data set,
    units are given as mg/kg of dry soil.

21) Data set documentation history log:
    ----------------------------------------------------------------
    Data set title     - Ant nest soil nutrients
    Data set file name - ANSNUTR.DSD
    ----------------------------------------------------------------
         mm/dd/yyyy         - Date of Comment
         Int                - Initials of person making Comment
                              JPA  =  John P. Anderson
                              KR   =  Ken Ramsey
         Changes/Updates    - List any changes made to document

    mm/dd/yyyy  Int  Changes/Updates
    ----------  ---  -----------------------------------------------
    02/04/1998  JPA  Data set documentation completed.
    10/04/2004  KR   Added Dataset ID and Project ID to top of form.
                     Changed format for Attributes and Associated
                     Files section.
                     Removed Missing/Questionable data section and
                     incorporated into Attributes section.
                     Updated Associated Files section.
    07/31/2005  JPA  Updated attributes section.
    08/01/2005  JPA  Added Phosphorus unit of measure (see Comments)
    09/18/2007  KR   Updated Responsible Investigators and Researchers 
                     sections to reflect dates associated with dataset.
 -------------------------------------------------------------------
                         END OF DATA SET FILE
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