Summary Information
Monsoon Rainfall Manipulation Experiment (MRME) Carbon Dioxide Data from the Sevilleta National Wildlife Refuge, New Mexico (7/2007-8/2009)
Creator:
Individual: Scott Collins
Physical Address:
Delivery Address: Department of Biology, MSC03 2020, 1 University of New Mexico
City: Albuquerque
Locality: NM
Postal Code: 87131
Phone: US
Email: scollins@sevilleta.unm.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: 2010-09-15
Language: English
Abstract:
The Monsoon Rainfall Manipulation Experiment (MRME) is to understand changes in ecosystem structure and function of a semiarid grassland caused by increased precipitation variability, which alters the pulses of soil moisture that drive primary productivity, community composition, and ecosystem functioning. The overarching hypothesis being tested is that changes in event size and variability will alter grassland productivity, ecosystem processes, and plant community dynamics. In particular, we predict that many small events will increase soil CO2 effluxes by stimulating microbial processes but not plant growth, whereas a small number of large events will increase aboveground NPP and soil respiration by providing sufficient deep soil moisture to sustain plant growth for longer periods of time during the summer monsoon.
Keywords:
Keyword: primary production
Keyword Thesaurus: Core Areas
Keywords:
Keyword: precipitation
Keyword: rain
Keyword: respiration
Keyword: photosynthesis
Keyword: carbon dioxide
Keyword: deserts
Keyword: grasslands
Keyword Thesaurus: LTER Controlled Vocabulary
Additional Information:
Additional Study Area InformationStudy Area Name: Monsoon siteStudy Area Location: Monsoon site is located just North of the grassland Drought plotsVegetation: dominated by black grama (Bouteloua eriopoda), and other highly prevalent grasses include Sporabolus contractus, S.cryptandrus, S. lexuosus, Muhlenbergia aernicola and Bouteloua gracilis.North Coordinate:34.20143South Coordinate:34.20143East Coordinate:106.41489West Coordinate:106.41489 Additional Information on the Data Collection Period Ongoing collection.
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://sev.lternet.edu/data/sev-224
Coverage:
Geographic Goverage:
Geographic Description: The Monsoon site is located within Five Points Black Grama, just to the north of the grassland drought plots. On August 4, 2009, a lightning-initiated fire began on the Sevilleta National Wildlife Refuge. The Monsoon site was entirely burned on this date, with all plots subjected to fire of comparable intensity.
Bounding Coordinates:
West Bounding Coordinates: -106.726
East Bounding Coordinates: -106.726
North Bounding Coordinates: 34.344
South Bounding Coordinates: 34.344
Bounding Altitude:
Altitude Minimum: 1615
Altitude Maximum: 1615
Altitude Units: meter
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2006-09-27
End Date:
Calendar Date: 2009-07-24
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 MRME contains three ambient precipitation plots and five replicates of the following treatments: 1) ambient plus a weekly addition of 5 mm rainfall, 2) ambient plus a monthly addition of 20 mm rainfall. Rainfall is added during the monsoon season (July-Sept) by an overhead (7 m) system fitted with sprinkler heads that deliver rainfall quality droplets. At the end of the summer, each treatment has received the same total amount of added precipitation, delivered in different sized events. Each plot (9x14 m) includes subplots (2x2 m) that receive 50 kg N ha-1 y-1. Each year we measure: (1) seasonal (July, August, September, and October through June) soil N, (2) plant species composition and ANPP, (3) seasonal root and fungal dynamics in minirhizotrons, and (4) soil temperature, moisture and CO2 fluxes (using in situ solid state CO2 sensors). In addition, soil N2O  fluxes, and predawn and mid-day (10-12 AM) water potential and mid-day leaf photosynthetic gas exchange and stomatal conductance of black grama are measured prior to and up to 5 days after scheduled precipitation events.Soil Measurements Soil temperature and water content were measured with ECH2O soil sensors. Soil CO2 was measured with solid state CO2 sensors. For each plot, soil sensors were placed under the canopy of B. eriopoda to a depth of 2, 8, and 16 cm. Measurements were recorded every 30 minutes. Daily soil water content at each depth was calculated as the average soil water content for measurement times between the hours of 0000-06:00.
Instrumentation: Instrument Name: Solid State Soil CO2 sensorManufacturer: VaisalaModel Number: GM222
Data Table:
Entity Name: sev224_monsoon_co2_02092012.txt
Entity Description: Data for SEV224.
Object Name: sev224_monsoon_co2_02092012.txt
Size: 75778089
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/224/108606/d40a94eefc259921de2eef7c108fc613
Coverage:
Temporal Coverage:
Calendar Date: 2012-01-05
Attribute List:
Attribute Name: timestamp
Attribute Label: timestamp
Attribute Definition: time recorded by Campbell datalogger when observation was collected
Storage Type: date
Measurement Scale:
Datetime:
Format String: YYYYMMDDhhmmss
Attribute Name: date
Attribute Label: date
Attribute Definition: date and time as recorded by Campbell datalogger
Storage Type: date
Measurement Scale:
Datetime:
Format String: MM/DD/YYThh:mm:ss
Attribute Name: plot
Attribute Label: plot
Attribute Definition: Monsoon Study plot number, which ranges from 1 to 13
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: Monsoon Study plot number, which ranges from 1 to 13
Attribute Name: treatment
Attribute Label: treatment
Attribute Definition: Monsoon study treatments
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: c
Definition: ambient rainfall
Code Definition:
Code: s
Definition: weekly 5 mm rainfall
Code Definition:
Code: l
Definition: monthly 20 mm rainfall
Code Definition:
Code: cf
Definition: ambient rainfall + fertilizer
Code Definition:
Code: sf
Definition: weekly 5 mm rainfall + fertilizer
Code Definition:
Code: lf
Definition: monthly 20 mm rainfall + fertilizer
Attribute Name: depth
Attribute Label: depth
Attribute Definition: depth of probe beneath soil surface
Measurement Scale:
Ratio:
Unit:
Standard Unit: centimeter
Numeric Domain:
Number Type: real
Missing Value Code:
Code: missing
Code Explanation: -999
Attribute Name: co2
Attribute Label: co2
Attribute Definition: concentration of CO2
Measurement Scale:
Ratio:
Unit:
Custom Unit: partsPerMillion
Numeric Domain:
Number Type: real
Missing Value Code:
Code: missing
Code Explanation: -999
Attribute Name: co2_qc
Attribute Label: co2_qc
Attribute Definition: quality control flag for co2 concentration
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: 1
Definition: invalid data-instrument malfunction
Code Definition:
Code: 2
Definition: invalid data-out of range
Code Definition:
Code: 3
Definition: invalid data- human verified
Code Definition:
Code: 20
Definition: valid data
Missing Value Code:
Code: missing
Code Explanation: -999
ratio of two quantities as parts per million (1:1000000)