+------------------------------------------------------------------+ | 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 . For fields that will not have information, enter . See data manager for any questions regarding this form. -------------------------------------------------------------------- Dataset ID: DSL2005027 Project ID: PRL2005014 1) Data set access (RESTRICTED or UNRESTRICTED): --------------------------------------------- RESTRICTED 2) Data set title: --------------- Fluff grass soil nitrogen 3) Project title: -------------- Fluff grass: Microarthropod effects on nitrogen availability 4) Responsible investigator(s): ---------------------------- Solange I. Silva, Jun1986-Nov1987 5) Date data collection commenced (mm/dd/yyyy): -------------------------------------------- 06/16/1986 6) Date data collection terminated (mm/dd/yyyy or ONGOING): -------------------------------------------------------- 11/16/1987 7) Expected duration of study: --------------------------- 18 months 8) Frequency of measurement: ------------------------- monthly 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): ---------------------------------------------------------------- Solange I. Silva, Jun1986-Nov1987 10) Methods of recording (field data sheets, instrumental, etc.): ---------------------------------------------------------------- data sheets 11) Site location (Describe in sufficient detail that the site can be relocated): ---------------------------------------------------------------- * This study was conducted in the Jornada del Muerto Basin on the NSF Long-Term Ecological Research (LTER) site, located on the New Mexico State University College Ranch 40 km NNE of Las Cruces, Dona Ana County, New Mexico. The site lies on an alluvial piedmont (bajada) sloping from west to the east and north. The non-arroyo areas of the upper bajada where this study was conducted have an essentially monospecific shrub cover of creosotebush and support a veriety of annuals and the small perennial grass Erioneuron pulchellum (fluff grass). Study plots were established in an area that is downslope from the LTER Upper Trailer and immediately downslope from the road running from the NMSU College Ranch headquarters SSE past the LTER Weather Station and exiting the College Ranch at the south boundary on the same powerline road that runs on along the north side of Mt. Summerford in the Dona Ana Mountains. 12) Data set description (State the hypothesis and / or objectives which collection of data set addresses): ---------------------------------------------------------------- This data set consists of soil analyses for nitrate, ammonium, total nitrogen, moisture content, organic matter, mite weight, nematode weight and root weight of Erioneuron pulchellum soil rhizosphere samples taken at monthly intervals from Silva's dissertation research plots. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Three randomly located subsamples were taken from each plot. 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: DATE attribute description: Sampling date ??? No format information given for I2 field measured units: N/A start column position: ??? variable format: I2 variable mask: N/A exception value codes: N/A acceptable value type: ??? acceptable value codes: ??? Valid values? variable name: PLOT attribute description: Plot location measured units: N/A start column position: ??? variable format: I2 variable mask: N/A exception value codes: N/A acceptable value type: ??? acceptable value codes: ??? Valid values? variable name: T attribute description: Treatment measured units: N/A start column position: ??? variable format: I1 variable mask: N/A exception value codes: N/A acceptable value type: ??? acceptable value codes: ??? Valid values? variable name: S attribute description: Subsample measured units: N/A start column position: ??? variable format: I1 variable mask: N/A exception value codes: N/A acceptable value type: ??? acceptable value codes: ??? Valid values? variable name: SNO3 attribute description: Soil nitrate measured units: mg/kg start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SNH3 attribute description: Soil ammonium measured units: mg/kg start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: STN attribute description: Soil total nitrogen measured units: mg/kg start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SH2O attribute description: Soil moisture content measured units: %/w start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SOM attribute description: Soil organic matter measured units: %/w start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SMW attribute description: Soil mites weight measured units: Wt(g) start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SNW attribute description: Soil nematodes weight measured units: Wt(g) start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated acceptable value type: N/A acceptable value codes: N/A variable name: SRW attribute description: Soil roots weight measured units: Wt(g) start column position: ??? variable format: F5.2 variable mask: N/A exception value codes: ??? None indicated 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.) ---------------------------------------------------------------- Samples were collected from the rhizosphere of Erioneuron pulchellum plants monthly using a soil core (10cm diameter x 15cm length centered on each plant). Plants were measured (2 diameters, 1 height), clipped at ground level and stored in a paper bag. Soils were placed in a plastic bag, stored in a cooler and immediately taken to the laboratory for analysis of soil organic matter, soil moisture, ammonium, nitrate, and total nitrogen. For each soil sample, subsamples were taken for extraction of microarthropods and nematodes. Microarthropods were extracted in modified Tullgren funnels into water (Santos, et al. 1978), then counted and identified to species (Krantz 1978). Nematodes were extracted by a modified sugar flotation technique (Freckman et al. 1977). Gravimetric soil moisture: 10 g of well-mixed soil from each sample was oven-dried for 48 hours at 105 C, and reweighed. 15) Key literature (Citations that describe sampling procedures, [reference of a published paper, thesis, etc.]): ---------------------------------------------------------------- Freckman, D.W., D.T. Kaplan and S.D. Van Gundy. 1977. A comparison of techniques for extraction and study of anhydrobitic nematodes from dry soils. Journal of Nematology 9: 176-181. Krantz, G.W. 1978. A manual of acarology, 2nd edition. Oregon State University, Corvallis. Santos, P.F., E. DePree and W.G. Whiford. 1978. Spatial distribution of litter and microarthropods in a Chihauahuan Desert ecosystem. Journal of Arid Environments 1: 41-48. Silva, Solange Inacia. 1989. The effects of microarthropods on nitrogen availability within the rhizosphere of Erioneuron pulchellum in a northern Chihuahuan desert ecosystem. Dissertation, New Mexico State University, Las Cruces, New Mexico. 16) Keywords (keywords that describe data set; maximum of 10): ---------------------------------------------------------------- nitrogen, soil organic, nematodes, microarthropods 17) Treatment of data: (List any programs used in analysis of the data): [Note: Programs should be appended and stored with this form.] ---------------------------------------------------------------- 18) Associated computer accounts: ---------------------------------------------------------------- 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: FLUFGRAS.PRJ description: Project documentation file format: Text file format type: ASCII file type: MD file name: N_SOIL.DSD description: Data set documentation file format: Text file format type: ASCII ------Data files---------------------------------------- file type: DS file name: N_SOIL.DAT description: Data set file file format: Text file format type: ASCII ------Data entry, verification, and analysis files------ ------Other (Any other related files)------------------- 20) Comments (Include any comments here that more fully describe this data set): ---------------------------------------------------------------- DATA IS NOT CURRENTLY USABLE. Documentation is incomplete for this data set. There is conflicting information provided for variables measured. Attribute description does not match the actual data set. Variables described as being measured in Methodology section and Data Set description section are inconsistent with each other. 21) Data set documentation history log: ---------------------------------------------------------------- Data set title - Fluffgrass soil nitrogen Data set file name - N_SOIL.DSD ---------------------------------------------------------------- mm/dd/yyyy - Date of Comment Int - Initials of person making Comment JPA = John P. Anderson SIS = Solange I. Silva MAB = Michelle A. Buonopane KR = Ken Ramsey Changes/Updates - List any changes made to document mm/dd/yyyy Int Changes/Updates ---------- --- ----------------------------------------------- 10/16/1987 SIS Form completed by investigator 10/16/1987 Last file time stamp to original documentation 10/20/1999 JPA Documentation converted to new form 07/08/2002 MAB Added methodology information. 07/19/2005 KR Added Dataset and Project IDs to top of form. Changed format of Responsible Investigators and Researcher sections 07/20/2005 KR Changed format of Attributes and Associated Files sections. Incorporated Missing Values section into Attributes section. 01/30/2006 JPA Changed to Restricted access because the data attributes are not correctly defined. It is hoped that further investigation will allow correct identification and description of attributes so data can be made available. ------------------------------------------------------------------- END OF DATA SET FILE -------------------------------------------------------------------