soil water content

Dataset: 

Study number: 

328

Data set ID: 

210328003

Date range: 

2011-07-12 to 2013-12-13

Data contact: 

Abstract: 

This completed dataset contains soil moisture data from a study at the Jornada Experimental Range (JER) in southern New Mexico. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009 and has five precipitation treatments (see Methods).

While the study began in 2009, contains 50 plots (10 per treatment) and is ongoing, these data were only collected from July 2011 to December 2013 in a subset of 20 plots (4 per treatment). This dataset is intended to provide information about the amount of water in the top 30 cm of soil as well as verify that experimental precipitation manipulations are effective. Figure of soil moisture by precipitation treatment: https://jornada.nmsu.edu/sites/jornada.nmsu.edu/files/files/data/soil_moisture_figure.jpg Metadata and data on EDI: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-jrn&identifier=210328003

Data download: 

Description: 

soil moisture and precipitation data from interannual precipitation variability study

soil moisture and precipitation data from interannual precipitation variability study

Keywords: 

Dataset: 

Study number: 

27

Data set ID: 

210278001

Date range: 

2007-07-24 to 2009-08-10

Original investigator: 

Lara G Reichmann

Data contact: 

Abstract: 

A 2-year experiment with ambient, reduced, and enhanced precipitation was designed to compare the performance of the  encroaching C3 shrub (honey mesquite Prosopis glandulosa) to the dominant C4 grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates and leaf water status.

A 2-year experiment with ambient, reduced, and enhanced precipitation was designed to compare the performance of the  encroaching C3 shrub (honey mesquite Prosopis glandulosa) to the dominant C4 grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates and leaf water status. Precipitation manipulations dramatically enhanced natural variability and generated a range of rainfall scenarios that could have only been studied only after a multi-decade effort using natural conditions. Responses were highly asymmetric, with precipitation (PPT) additions generally influencing volumetric water content (vwc) to a greater extent than PPT reductions. Desert soils are usually close to their minimum water content  and thus when soils were dry, the effects of reducing PPT were relatively minor compared to the effects of adding PPT. Volumetric soil water content was, on average, lower and more variable at the shallower (0–5 cm) depth (mean 9.3 ± 0.14%; range 5.7–14.3%) than at the deeper (30–50 cm) depth (mean 14.4 ± 0.12%; range 10.8–18.1%. This study is complete. For further information and results, see:

Throop, H., L. G. Reichmann, Os. Sala, and S. Archer. 2012.  Response of dominant grass and shrub species to water manipulation: an ecophysical basis for shrub invasion in a Chihuahuan desert grassland. Oecologia 169: 373-383.

 

 

 

Data download: 

Description: 

Water content in precipitation treatment plots at 2 depth profiles

LTER Core Area(s): 

Dataset: 

Study number: 

12

Data set ID: 

210012001

Date range: 

1982-04-30 to 2018-01-30

Original investigator: 

Peter Wierenga

Data contact: 

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 download: 

Description: 

CSV data file for Jornada dataset: Transect Soil Water Content Raw Count Data

CSV data file for Jornada dataset: Transect Soil Water Content Raw Count Data

LTER Core Area(s): 

Dataset: 

Study number: 

12

Data set ID: 

210012002

Date range: 

1982-04-30 to 2015-12-04

Original investigator: 

Peter Wierenga

Data contact: 

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 download: 

Description: 

Data file information for the following Jornada data set: Transect Soil Water Content

LTER Core Area(s): 

Dataset: 

Study number: 

13

Data set ID: 

210013002

Date range: 

1989-07-05 to 2011-07-01

Original investigator: 

Wesley Jarrell

Data contact: 

Abstract: 

        NOTE: 1. This dataset should only be used as a reference from this 
                         point forward (12/14/2071).
                    2. This dataset has been replaced by the NPP Soil Volumetric 
                        Water Content dataset 

        NOTE: 1. This dataset should only be used as a reference from this 
                         point forward (12/14/2071).
                    2. This dataset has been replaced by the NPP Soil Volumetric 
                        Water Content dataset 
                        (https://jornada.nmsu.edu/content/soil-volumetric-water-content-15-npp-sites-jornada-basin-lter-1989).
                        which contains the recalculated VWC values in addition to the 
                        adjusted raw count data from the hydroprobe.

Once a month soil water content measurements are made at 10 depths (where possible) at each of 10 access tubes at each of the 15 LTER-II sites using a neutron probe (Campbell Model 503DR Hydroprobe). Measurements are taken at 30cm, 60cm, 90cm, 120cm, 150cm, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to "." in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. Data from neutron probe data logger is dumped to disk. Raw count data is then converted to water content using a Fortran program called WC2.FOR (water content for LTER-II). Water content data is then sorted by i.d. number using a LOTUS 123 macro found in WC2_SORT.WQ1 which creates final version of water content data set for the month in a separate file. Two files per month are saved: raw count data (mmddyy-2.RAW; ex. 121189-2.RAW where -2 indicates LTER-II NPP site neutron probe readings) and calculated/ sorted soil water content data appended to data file containing that year's data (NPPSWCyy.DAT; example NPPSWC89.DAT contains NPP soil water content data for 1989). Regression equation was derived by Mahlia Nash, and after datalogger upgrade was added to hydroprobe, by David Hudson, both working for Dr. Peter Wierenga (as of 1994 at university at Tucson (Hudson's phone # is 602-621-3236). See PROBE.HIS file for probe history and regressions used for different data periods when different probes were used. The hydroprobe used whenever possible is Hydroprobe Model CPN503DR (Campbell Pacific Nuclear, Pacheco, CA) with data logger. This probe has a 50mCi241 Am-Be source and a hydrogen detector. Neutrons encountering hydrogen become thermalized. The detector totals returning thermalized neutrons over a 16 second sample time which is the raw count value displayed. The raw count value is then substituted into the proper regression equation for cm3 of water per cm3 of soil.

Description: 

Data file information for the following Jornada data set: NPP Soil Water Content

LTER Core Area(s): 

Dataset: 

Study number: 

13

Data set ID: 

210013001

Date range: 

1989-07-05 to 2009-12-04

Original investigator: 

Wesley Jarrell

Data contact: 

Abstract: 

        NOTE: 1. This dataset should only be used as a reference from this 
                         point forward (12/14/2071).
                    2. This dataset has been replaced by the NPP Soil Volumetric 
                        Water Content dataset 

        NOTE: 1. This dataset should only be used as a reference from this 
                         point forward (12/14/2071).
                    2. This dataset has been replaced by the NPP Soil Volumetric 
                        Water Content dataset 
                        (https://jornada.nmsu.edu/content/soil-volumetric-water-content-15-npp-sites-jornada-basin-lter-1989).
                        which contains the recalculated VWC values in addition to the 
                        adjusted raw count data from the hydroprobe.

Once a month soil water content measurements are made at 10 depths (where possible) at each of 10 access tubes at each of the 15 LTER-II sites using a neutron probe (Campbell Model 503DR Hydroprobe). Measurements are taken at 30cm, 60cm, 90cm, 120cm, 150cm, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to \\".\\" in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. The hydroprobe currently used is Hydroprobe Model CPN503DR (Campbell Pacific Nuclear, Pacheco, CA) with data logger. This probe has a 50mCi241 Am-Be source and a 3He detector. Neutrons encountering hydrogen become thermalized. The detector totals the returning thermalized neutrons over a 16 second sample time which is the raw count value displayed. The raw count value is then substituted into the proper regression equation for cm3 of water per cm3 of soil. Data from neutron probe data logger is dumped to disk. Raw count data is then converted to water content. Two files per month are saved: raw count data (mmddyy-2.RAW; ex. 121189-2.RAW where -2 indicates LTER-II NPP site neutron probe readings) and calculated/sorted soil water content data appended to data file containing that year's data (NPPSWCyy.DAT; example NPPSWC89.DAT contains NPP soil water content data for 1989). See PROBE.HIS file for probe history and regressions used for different data periods when different probes were used.

Description: 

Data file information for the following Jornada data set: NPP Soil Water Content Raw

LTER Core Area(s): 

Dataset: 

Study number: 

368

Data set ID: 

210368004

Date range: 

1987-01-01 to 1987-05-31

Original investigator: 

Rodolfo R Di Marco

Data contact: 

Abstract: 

The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2.

How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains soil water content data measured gravimetrically at monthly intervals from January to May. Soil samples were taken from ant nest edge and from adjacent reference sites (5 m apart).

Data download: 

Description: 

Data file information for the following Jornada data set: Ant nest soil water content

LTER Core Area(s): 

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