Summary Information
Livestock Exclosure Nutrient Study from a Chihuahuan Desert Grassland at the Sevilleta National Wildlife Refuge, New Mexico (2003)
Creator:
Individual: Lydia Zeglin
Physical Address:
Delivery Address: ,
Phone: US
Email: lydia.zeglin@oregonstate.edu
Metadata Provider:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publication Date: 2016-03-03
Language: English
Abstract:
Data on soil characteristics and dominant grass and soil chemical composition gathered on active rangeland, livestock exclosures on active rangeland, and the Sevilleta NWR.
Keywords:
Keyword: disturbance
Keyword: inorganic nutrients
Keyword Thesaurus: Core Areas
Keywords:
Keyword: soil texture
Keyword: grazing
Keyword: grazing
Keyword: nutrients
Keyword: organic matter
Keyword: water
Keyword: soil
Keyword: grasslands
Keyword: grasses
Keyword Thesaurus: LTER Controlled Vocabulary
Additional Information:
Additional field crew member: Ben Zimmerman Additional Study Area Information Study Area Name: Pino Gate Study Area Location: The study site was located near the base of the Los Pinos mountains and directly adjacent to the nothern fencline of the SNWR at Pino GateElevation: 1600 m Vegetation: Burrograss (Scleropogon brevifolius), sand dropseed (Sporobolus ryptandrus), and black grama (Bouteloua eriopoda) were the dominant vegetation. Soils: Deep clayey loam soilsGeology: On an upper bajada slope, in a broad swale Climate: Long-term mean annual precipitation is 243 mm, about 60% of which occurs during the summer. Long-term mean monthly temperatures for January and July are 1.5°C and 25.1°C, respectively. Site history: Historically, prairie dogs were common throughout the area, but were exterminated by the early 1970’s (John Ford, United States Department of Agriculture Wildlife Services, personal communication). Gunnison’s prairie dogs began to re-colonize the study site from adjacent private land in 1998. During our study, the colony occurred within a 5 ha area, near the base of the Los Piños Mountains in an area with deep clayey loam soils. The site has been long inhabited by kangaroo rats, and represents typical northern Chihuahuan Desert grassland.North Coordinate:34.406954South Coordinate:34.406954East Coordinate:-106.606269West Coordinate:-106.606269 Additional Metadata Animal grazers affect grassland disturbance patterns via changes in plant community composition and structure, nutrient cycling, and soil structure. Human-managed livestock grazing is a significant grassland disturbance worldwide.Research Questions/Hypotheses: a. Is livestock grazing related to changes in arid grassland soil structure and chemical composition or plant nutrient composition? If so, how? (hypothesis) Grazed rangeland will have more compact soil (lower water holding capacity), lower levels of nutrients (C, N, P) and lower organic matter content than grassland unaffected by livestock grazing. Grazed rangeland will produce grasses of lower nutritional quality (i.e. higher C:N and C:P ratios) than grassland unaffected by livestock grazing. b. When livestock are exclosed from a rangeland, does soil structure and chemical composition or plant nutrient composition `recover', exhibit resilience, align more closely with values characteristic of grassland unaffected by livestock grazing?(hypothesis) Within livestock exclosures (free of livestock for 9 years) soil water holding capacity will be higher, levels of nutrients (C, N, P) and organic matter content will be higher, and plant nutritional quality will be higher (C:N and C:P ratios will be lower) than on grazed rangeland. These structural and chemical characteristics will be intermediate between those of grazed rangeland and grassland unaffected by livestock grazing.
Intellectual Rights:
Data Policies
This dataset is released to the public and may be freely downloaded. Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement of the Sevilleta LTER. A copy of any publications using these data must be supplied to the Sevilleta LTER Information Manager.
Distribution:
Online:
URL: http://sevdeims-d.lternet.edu/data/sev-159
Coverage:
Geographic Goverage:
Geographic Description: Cattle pastures are currently grazed, exclosures added in 1993. Plots are located on both sides of the dirt road in the cattle pasture.
Bounding Coordinates:
West Bounding Coordinates: -106.61
East Bounding Coordinates: -106.61
North Bounding Coordinates: 34.416
South Bounding Coordinates: 34.416
Bounding Altitude:
Altitude Minimum: 1600
Altitude Maximum: 1600
Altitude Units: meter
Geographic Goverage:
Geographic Description: On the eastern side of McKenzie and Nunn Flats areas just west of the Los Pinos Mountains
Bounding Coordinates:
West Bounding Coordinates: -106.609
East Bounding Coordinates: -106.609
North Bounding Coordinates: 34.406
South Bounding Coordinates: 34.406
Bounding Altitude:
Altitude Minimum: 1600
Altitude Maximum: 1600
Altitude Units: meter
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2003-08-01
End Date:
Calendar Date: 2003-09-01
Contact:
Position Title: Information Manager
Organization: LTER Network Office
Physical Address:
Delivery Address: UNM Biology Department, MSC03-2020
Delivery Address: 1 University of New Mexico
City: Albuquerque
Locality: NM
Postal Code: 87131-0001
Phone: USA
Phone: 505 277-2535
Phone: 505 277-2541
Email: tech-support@lternet.edu
URL: http://www.lternet.edu
Contact:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publisher:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publication Place: Sevilleta LTER
Method Step:
Description:
Experimental Design This study compares grazed grassland (treatment G), grassland within livestock exclosures (treatment X) and undisturbed (by livestock) grassland (treatment S - for Sevilleta). During the winter of 1992/1993, three 300m x 300m plots were delineated for each of these three treatments. Plots are referred to as G1, G2, G3, X1, X2, X3, S1, S2, and S3 (number increasing from west to east). Each of these nine plots are separated by at least 300 m. Exclosure plots are surrounded by wire fencing, and the Sevilleta plots are located within the NWR boundary. A rodent trapping web is centered within each plot. Within the framework of this mammal trapping web, twelve 3x4 m quadrats were randomly placed. Corners of plots are marked by aluminum fence posts and locations were recorded with GPS. Centers and lines of mammal trapping webs are marked by 1m high (centers and end of lines) and .25m high (lines) rebar and aluminum numbered tags. Corners of quadrats are marked by short rebar. The location of mammal trapping webs and quadrats is the same within each plot. For this particular study a subsample of four quadrats, chosen randomly for each plot, within each plot was sampled. Data collected include soil texture, field water content, 50% water holding capacity, organic matter content, percent C, percent N, percent P, and dominant grass (usually Bouteloua eriopoda) percent C, percent N, and percent P. Soil samples were collected as cores to 10cm depth, with 5-10 cores taken along a diagonal from one corner of the quadrat to the other corner, then pooled in a plastic bag as one sample from each quadrat. Grass samples of green above-ground tissue (growth from summer/fall 03) include tissue from 5-10 individual plants within the quadrat. All analyses were conducted for each quadrat excepting soil texture, for which equal weights of soil from each quadrat were pooled into one sample per plot. Soil samples were collected on 8/10/03 and plant samples were collected on 10/18/03, before and after the most significant rains of the season. Soil texture was analyzed using the hydrometer method, and data are recorded as sand, silt, and clay. Soil field water content was measured as the difference in weight before and after the drying of a subsample of soil. Soil organic matter was measured as the difference in weight before and after combustion of a subsample of dry soil. Soil 50% water holding capacity was measured using standard Sevilleta techniques (after White). Soil and plant percent C and N were measured using a Carlo Erba AutoAnalyzer. Soil and plant percent P was measured as extractable P, converted to PO4-P, using a Technicon AutoAnalyzer.
Data Table:
Entity Name: sev159_exclosnutrient_09212005.txt
Entity Description: Data for the Livestock Exclosure Nutrient Study
Object Name: sev159_exclosnutrient_09212005.txt
Size: 4186
Data Format:
Text Format:
Number of Header Lines: 1
Record Delimiter: \r\n
Attribute Orientation: column
Simple Delimited:
Field Delimiter: ,
Distribution:
Online:
URL: https://pasta.lternet.edu/package/data/eml/knb-lter-sev/159/220447/18751ec5eba50ab4a36bf3f1c1507ab9
Coverage:
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2003-08-01
End Date:
Calendar Date: 2003-09-01
Attribute List:
Attribute Name: treatment
Attribute Label: treatment
Attribute Definition: Grazing disturbance level
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: G
Definition: grazed
Code Definition:
Code: X
Definition: exclosure
Code Definition:
Code: S
Definition: Sevilleta
Attribute Name: plot
Attribute Label: plot
Attribute Definition: plot from which data were collected
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: plot from which data were collected
Attribute Name: quad
Attribute Label: quad
Attribute Definition: The quadrat at which data was collected.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The quadrat at which data was collected.
Attribute Name: pct_sand
Attribute Label: pct_sand
Attribute Definition: soil texture percent sand
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 100
Maximum: 0
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: pct_silt
Attribute Label: pct_silt
Attribute Definition: soil texture percent silt
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: pct_clay
Attribute Label: pct_clay
Attribute Definition: soil texture percent clay
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: soil_fwc
Attribute Label: soil_fwc
Attribute Definition: soil field water content
Measurement Scale:
Ratio:
Unit:
Custom Unit: gramPerGram
Numeric Domain:
Number Type: real
Missing Value Code:
Code: na
Code Explanation: missing
Attribute Name: soil_om
Attribute Label: soil_om
Attribute Definition: soil organic matter content
Measurement Scale:
Ratio:
Unit:
Custom Unit: gramPerGram
Numeric Domain:
Number Type: real
Missing Value Code:
Code: na
Code Explanation: missing
Attribute Name: soil_50pctwhc
Attribute Label: soil_50pctwhc
Attribute Definition: soil 50% water holding capacity
Measurement Scale:
Ratio:
Unit:
Custom Unit: gramPerGram
Numeric Domain:
Number Type: real
Missing Value Code:
Code: na
Code Explanation: missing
Attribute Name: soil_pctC
Attribute Label: soil_pctC
Attribute Definition: soil percent C by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: na
Code Explanation: missing
Attribute Name: soil_pctN
Attribute Label: soil_pctN
Attribute Definition: soil percent N by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: na
Code Explanation: missing
Attribute Name: soil_pctP
Attribute Label: soil_pctP
Attribute Definition: soil percent P by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: soil_c_n
Attribute Label: soil_c_n
Attribute Definition: Soil C:N ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: Soil C:N ratio
Attribute Name: soil_c_p
Attribute Label: soil_c_p
Attribute Definition: soil C:P ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: soil C:P ratio
Attribute Name: soil_n_p
Attribute Label: soil_n_p
Attribute Definition: soil N:P ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: soil N:P ratio
Attribute Name: grass_pctC
Attribute Label: grass_pctC
Attribute Definition: grass percent C by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: grass_pctN
Attribute Label: grass_pctN
Attribute Definition: grass percent N by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: grass_pctP
Attribute Label: grass_pctP
Attribute Definition: grass percent P by mass
Measurement Scale:
Ratio:
Unit:
Custom Unit: percent
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Maximum: 100
Missing Value Code:
Code: *
Code Explanation: missing
Attribute Name: grass_c_n
Attribute Label: grass_c_n
Attribute Definition: grass C:N ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: grass C:N ratio
Attribute Name: grass_c_p
Attribute Label: grass_c_p
Attribute Definition: grass C:P ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: grass C:P ratio
Attribute Name: grass_n_p
Attribute Label: grass_n_p
Attribute Definition: grass N:P ratio
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: grass N:P ratio
ratio of two quantities as percent composition (1:100) grams per gram