transects

Dataset: 

Study number: 

15

Data set ID: 

210015002

Abstract: 

In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control transect is to the west, the Treatment transect on the east side of the Control transect, and the Alternate Control to the east of the Treatment transect. Each transect is 30 meters wide with a 45 meter buffer zone between each transect. The Treatment transect was treated annually until 1987 with NHNO3 in a concentration equal to 10g N/m2.Soil mineralization was examined on the control and fertilized treatment transects in association with the vegetation biomass study. In 1989, soil properties were measured. This dataset contains soil moisture correction factor, sample weight, total inorganic nitrogen (NO3+NO2-N), and nitrogen in ammonium (NH4-N) for Week F (field) of nitrogen mineralization potentials. This study is complete.

Data sources: 

data_JornadaStudy_015_transect_biomass_soil_mineralization_potential_field

LTER Core Area(s): 

Dataset: 

Study number: 

15

Data set ID: 

210015003

Abstract: 

In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control transect is to the west, the Treatment transect on the east side of the Control transect, and the Alternate Control to the east of the Treatment transect. Each transect is 30 meters wide with a 45 meter buffer zone between each transect. The Treatment transect was treated annually until 1987 with NHNO3 in a concentration equal to 10g N/m2.Soil mineralization was examined on the control and fertilized treatment transects in association with the vegetation biomass study. In 1989, soil properties were measured. This Dataset contains soil moisture correction factor, sample weight, total inorganic nitrogen (NO3+NO2-N), and nitrogen in ammonium (NH4-N) for Week 0 of nitrogen mineralization potentials. This sampling is complete.

Data sources: 

data_JornadaStudy_015_transect_biomass_soil_mineralization_potential_initial_data

LTER Core Area(s): 

Dataset: 

Study number: 

15

Data set ID: 

210015001

Abstract: 

In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965).  Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control transect is to the west, the Treatment transect is to the east side of the Control transect, and the Alternate Control is to the east of the Treatment transect. Each transect is 30 meters wide with a 45 meter buffer zone between each transect. The Treatment transect was treated annually until 1987 with NHNO3 in a concentration equal to 10g N/m2. The station markers occur at 30 meter intervals along each transect. Perpendicular to each transect and crossing at each station marker is the 30 meter plant line intercept transect. Biomass of annual and perennial forbs and grasses was obtained from a one meter quad selected at random just downslope from each of  6 5-meter segments of the 30 meter plant line transect located perpendicular to the transect station marker. Data presented here is for the control and treatment transects. This study is complete.

Data sources: 

data_JornadaStudy_015_transect_vegetation_biomass_data

LTER Core Area(s): 

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: 

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): 

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