+------------------------------------------------------------------+ | 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. -------------------------------------------------------------------- 1) Data set access (RESTRICTED or UNRESTRICTED): --------------------------------------------- UNRESTRICTED 2) Data set title: --------------- Fluff grass soil total nitrogen 3) Project title: -------------- Fluff grass: Microarthropod effects on nitrogen availability 4) Responsible investigator(s): ---------------------------- Solange I. Silva 5) Date data collection commenced (mm/dd/yyyy): -------------------------------------------- 06/15/1986 6) Date data collection terminated (mm/dd/yyyy or ONGOING): -------------------------------------------------------- 01/15/1987 7) Expected duration of study: --------------------------- 7 months 8) Frequency of measurement: ------------------------- 3 times (June 1986, October 1986, January 1987) 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 Walter G. Whitford 10) Methods of recording (field data sheets, instrumental, etc.): ---------------------------------------------------------------- instrumental 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 variety 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): ---------------------------------------------------------------- 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). Soil total Nitrogen was determined in the rhizosphere of fluffgrass. 13) Attributes measured: ------------------------------------------------------------------- Variable name: blank Number of columns between fields CCCCCCCC See attribute description Format: 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 code: * See attribute description listing See external listing of variable codes N/A = Not applicable VARIABLE MEASURED VARIABLE NAME FORMAT UNITS CODE ATTRIBUTE DESCRIPTION -------- -------- -------- -------- ------------------------- DATE I2 N/A 02 02= June 1986 06 06= October 1986 08 08= January 1987 PLOT I2 N/A 1-20 plot ID # TRT C3 N/A C C= control W W= water CH CH= chlordane CHW CHW=chlordane + water S I1 N/A 1-3 subsamples within plots TOTALN1D I3 mg/kg N/A mg/kg of dry soil Kjeldahl digestion Total N first digestion TOTALN2D I3 mg/kg N/A mg/kg of dry soil Kjeldahl digestion Total N second digestion 14) Missing or questionable values (describe how these are represented in the data set): ---------------------------------------------------------------- 15) Methodology (Provide sufficient detail such that an unaware reader could repeat the described data collection procedures.) ---------------------------------------------------------------- Three fluff grass rhizosphere soil subsamples were taken from each of 5 controls, 5 watered (1/4" weekly), 5 chlordane and water and 5 chlordane plots. Soils were sieved, air dried, ground, and analyzed for Total N (Kjehldahl method). 16) Key literature (Citations that describe sampling procedures, [reference of a published paper, thesis, etc.]): ---------------------------------------------------------------- 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. 17) Keywords (keywords that describe data set; maximum of 10): ---------------------------------------------------------------- nitrogen, fluffgrass, water irrigation, Chlordane 18) Treatment of data: (List any programs used in analysis of the data): [Note: Programs should be appended and stored with this form.] ---------------------------------------------------------------- 19) Associated computer accounts: ---------------------------------------------------------------- 20) Files associated with this data set: ---------------------------------------------------------------- A) Metadata files FILE NAME DESCRIPTION OF FILES ------------ ----------------------------------------------- FLUFGRAS.PRJ Project documentation SOIL_TN.DSD Data set documentation ------------ ----------------------------------------------- B) Data files FILE NAME DESCRIPTION OF FILES ------------ ----------------------------------------------- SOIL_TN.DAT Data set file ------------ ----------------------------------------------- C) Data entry, verification, and analysis files FILE NAME DESCRIPTION OF FILES ------------ ----------------------------------------------- ------------ ----------------------------------------------- D) Other (Any other related files.) FILE NAME DESCRIPTION OF FILES ------------ ----------------------------------------------- ------------ ----------------------------------------------- 21) Comments (Include any comments here that more fully describe this data set): ---------------------------------------------------------------- 22) Data set documentation history log: ---------------------------------------------------------------- Data set title - Fluffgrass soil total nitrogen Data set file name - SOIL-TN.DSD ---------------------------------------------------------------- mm/dd/yyyy - Date of Comment Int - Initials of person making Comment MAB = Michelle A. Buonopane JPA = John P. Anderson SIS = Solange I. Silva Changes/Updates - List any changes made to document mm/dd/yyyy Int Changes/Updates ---------- --- ----------------------------------------------- 04/14/1987 SIS Form completed by investigator 10/16/1987 Last file time stamp to original documentation 10/22/1999 JPA Documentation converted to new form 07/31/2002 MAB Site description added. ------------------------------------------------------------------- END OF DATA SET FILE -------------------------------------------------------------------