LTAR

USDA-ARS Long-Term Agroecosystem Research Network (https://www.tucson.ars.ag.gov/ltar)

Dataset: 

Study number: 

40

Data set ID: 

210401001

Abstract: 

Soil water potential recorded on data sheets for psychrometers along treatment and control transects every 5 stations at 5cm, 15cm and 30cm depths. Soil temperatures at these depths and calibration slope and intercept for each psychrometer are included in order to convert microvolt readings to -bar readings.

Data sources: 

data_JornadaStudy_401_transect_soil_water_potential_1986_to_1987

LTER Core Area(s): 

Dataset: 

Study number: 

40

Data set ID: 

210401002

Abstract: 

Soil water potential recorded on data sheets for psychrometers along treatment and control transects every 5 stations at 5cm, 15cm and 30cm depths. Soil temperatures at these depths and calibration slope and intercept for each psychrometer are included in order to convert microvolt readings to -bar readings.

Data sources: 

data_JornadaStudy_401_transect_soil_water_potential_1988

LTER Core Area(s): 

Dataset: 

Study number: 

375

Data set ID: 

210375001

Abstract: 

Data set includes bi-weekly records of number of termites observed within and beneath each of 4 rolls of toilet paper placed at each of 91 stations on treatment and control transects. Observations of presence of termite activity at each roll (paper eaten, cartons constructed) are also included.

Data sources: 

data_JornadaStudy_375_transect_ termite

LTER Core Area(s): 

Dataset: 

Study number: 

12

Data set ID: 

210012001

Abstract: 

Soil water content measurements in the form of raw count readings are made at 5 depths at each of 89 (2" O.D. diameter) aluminum access tubes on the Control transect and at every 5th station on the nitrogen fertilized Treatment transect using a neutron probe (Campbell Model 503DR Hydroprobe). Access tubes are installed such that there are 6 inches of tube aboveground. Stations are 30 meters apart. Measurements are taken at 30cm, 60cm, 90cm, 110cm, and 130cm. Neutron probe readings taken in 6 lysimeters along transects are also included. 5 standard readings are taken at beginning and end of each transect, and after every 20 stations. Measurements taken at 2 week intervals from April 1982 to 1987, monthly since.

Data sources: 

data_Jornada_012001_transect_soil_water_content_raw

LTER Core Area(s): 

Dataset: 

Study number: 

12

Data set ID: 

210012002

Abstract: 

Soil water content measurements (cm3 H2O / cm3 soil) at 5 depths at each of 89 (2" O.D. diameter) aluminum access tubes on the Control transect and at every 5th station on the nitrogen fertilized Treatment transect using a neutron probe (Campbell Model 503DR Hydroprobe). Access tubes are installed such that there are 6 inches of tube aboveground. Stations are 30 meters apart. Measurements are taken at 30cm, 60cm, 90cm, 110cm, and 130cm. Neutron probe readings taken in 6 lysimeters along transects are also included. 5 standard readings are taken at beginning and end of each transect, and after every 20 stations. Measurements taken at 2 week intervals from April 1982 to 1987, monthly since.

Data sources: 

data_Jornada_012002_transect_soil_water_content

LTER Core Area(s): 

Dataset: 

Data set ID: 

210400001

Abstract: 

Levels of basic cations (Ca, Mg, Na, K) extractable in 1N ammonium acetate (NH4Ac) from soils collected at stations C01 through C90 along the LTER-I Control transect.

Data sources: 

data_JornadaStudy_400_transect_soil_cation

LTER Core Area(s): 

Dataset: 

Study number: 

400

Data set ID: 

210400002

Abstract: 

PO4-P levels in CaCl2 and NaHCO3 extracts of soils collected at each station along transect. Moisture content of soil samples is also included. No soil samples were collected along the fertilized (treated transect) in January 1985; January 1986 data contains both fertilized (treated) and control transect samples.

Data sources: 

data_JornadaStudy_400_transect_soil_phosphate

LTER Core Area(s): 

Dataset: 

Study number: 

400

Data set ID: 

210400003

Abstract: 

Variation in the soil from place to place is a fact of nature and is substantial. It is a major source of uncertainty in soil survey and causes many of the difficulties of applying mathematics to the study of soil. Soil variability within small areas can be studied by using a straight line (transect) laid over a tract of known distance and can be sampled and observed equidistantly. Line transects give an indication of both the local and the general variation. The technique, however, may depend strongly on direction of the transect. Soil along the LTER I Control transect was sampled at 30 meter intervals from station C01 through C89. Soil characteristics were measured at 4 depths (30, 60, 90, and 120 cm) for the percent composition of clay, silt, sand, very coarse sand, coarse sand, medium sand, fine sand, very fine sand, calcium carbonate, organic carbon and coarse fragments greater than 2mm.

Data sources: 

data_JornadaStudy_400_transect_soil_particle_size

LTER Core Area(s): 

Dataset: 

Study number: 

400

Data set ID: 

210400004

Abstract: 

Total nitrogen in soil was determined on control and treatment (fertilized) transects by Kjeldahl digestion.

Data sources: 

data_JornadaStudy_400_transect_soil_total_nitrogen

LTER Core Area(s): 

Dataset: 

Study number: 

399

Data set ID: 

210399001

Abstract: 

NO3 + NO2-N and NH4-N levels of soil samples collected at each station along transect. Moisture content of soil samples is also included.

Data sources: 

data_JornadaStudy_399_transect_soil_nitrogen

LTER Core Area(s): 

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