Inorganic Nutrients

LTER Core Area: Inorganic Nutrients

Dataset: 

Study number: 

385

Data set ID: 

210385001

Date range: 

1986-12-05 to 1987-04-08

Original investigator: 

Solange I Silva

Data contact: 

Abstract: 

A mesocosm experiment was conducted on fluff grass (Erioneuron pulchellum) plants to look at the effect of exclusion of mites (with chlordane), nematodes (NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen.

A mesocosm experiment was conducted on fluff grass (Erioneuron pulchellum) plants to look at the effect of exclusion of mites (with chlordane), nematodes (NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen.

Data download: 

Description: 

Data file information for the following Jornada data set: Fluff grass mesocosm: mites and nematodes

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385002

Date range: 

1986-06-16 to 1986-08-16

Original investigator: 

Solange I Silva

Data contact: 

Abstract: 

Nitrogen mineralization potential of soil rhizosphere of Erioneuron
pulchellum from Silva\'s dissertation research plots. Twenty 6 x 6 m
plots were established with a 3 m buffer between plots. Five plots were
randomly assigned to one of four treatments: (1) chlordane amendment

100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods,
(2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6
mm/week) plus chlordate amendment (as above), (4) control (no treatment).
Three randomly located subsamples were taken from each plot
consisting of a fluff grass plant and a soil core 10 cm in diameter
and 15 cm deep centered on each plant. [taken from page 11 of
dissertation]

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Description: 

LTER Core Area(s): 

Keywords: 

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).

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Description: 

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

LTER Core Area(s): 

Dataset: 

Study number: 

368

Data set ID: 

210368002

Date range: 

1987-06-24

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 chemical analyses for soil samples collected from five ant nests for each of the three sites for total nitrogen, (ammonium, nitrate), inorganic phosphorus, and exchangeable cations (K+, Na+, Ca2+ and Mg2+). Also included is below ground biomass from five ant nests for each of the three sites.

Data download: 

Description: 

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

LTER Core Area(s): 

Dataset: 

Study number: 

393

Data set ID: 

210393001

Date range: 

1988-06-08 to 1988-06-30

Original investigator: 

William H Schlesinger

Data contact: 

Abstract: 

Ammonia volatilization was measured at three sites in the Chihuahuan Desert of southern New Mexico, U.S.A. In dry soils, ammonia volatilization ranged from 9 to 11 micrograms of nitrogen per square meter per day, but rates increased to 95 micrograms of nitrogen per square meter per day in a shrubland site after an experimental addition of water.

Ammonia volatilization also increased with experimental additions of NH4Cl and decreased with additions of sucrose. Competition by nitrifiers for available NH4+ had little effect on NH3 volatilization: N-Serve, added to inhibit nitrification, decreased NH3 volatilization in a grassland site and had little effect at other sites. We suggest that NH3 volatilization is controlled by the rate of mineralization of NH4+ from soil organic matter, and mineralization is stimulated by rainfall. Overall rates of NH3 volatilization from undisturbed desert ecosystems appear to be much lower than those reported for rangeland and agricultural soils.

The data set shows ammonia volatilization from grassland, cresotebush, and playa habitats in response to a variety of experimental treatments chosen to elucidate the processes controlling the volatilization under dry and post-rainfall conditions. Ammonia is collected in weak acid in scintillation vials placed inside PVC chambers in the field. The rate of ammonia volatilized per unit area ugN/m2/day) is found by mulitplying the concentration in the acid by 1250 to account for volume and area corrections.

Data download: 

Description: 

Data file information for the following Jornada data set: Ammonia volatilization from Chihuahuan Desert habitats - 1988

LTER Core Area(s): 

Dataset: 

Study number: 

393

Data set ID: 

210393002

Date range: 

1989-06-01 to 1989-06-30

Original investigator: 

William H Schlesinger

Data contact: 

Abstract: 

Ammonia volatilization was measured at three sites in the Chihuahuan Desert of southern New Mexico, U.S.A. In dry soils, ammonia volatilization ranged from 9 to 11 micrograms of nitrogen per square meter per day, but rates increased to 95 micrograms of nitrogen per square meter per day in a shrubland site after an experimental addition of water.

Ammonia volatilization also increased with experimental additions of NH4Cl and decreased with additions of sucrose. Competition by nitrifiers for available NH4+ had little effect on NH3 volatilization: N-Serve, added to inhibit nitrification, decreased NH3 volatilization in a grassland site and had little effect at other sites. We suggest that NH3 volatilization is controlled by the rate of mineralization of NH4+ from soil organic matter, and mineralization is stimulated by rainfall. Overall rates of NH3 volatilization from undisturbed desert ecosystems appear to be much lower than those reported for rangeland and agricultural soils. Data set shows ammonia volatilization from the grassland soils at the base of Mount Summerford in response to a variety of experimental treatments chosen to elucidate the processes controlling the volatilization rate. Ammonia is collected in weak acid in scintillation vials placed inside PVC chambers in the field. The rate of ammonia volatilization per unit area (ugN/m2/day) is found by multiplying the concentration in the acid by 1250.

Data download: 

Description: 

Data file information for the following Jornada data set: Nitrogen volatized as ammonia -- 1989

LTER Core Area(s): 

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