LTER

U.S. Long-Term Ecological Research Network (https://www.lternet.edu)

Dataset: 

Study number: 

385

Data set ID: 

210385006

Abstract: 

An ion exchange resin bag technique (Binkley 1984, Lajtha 1988) was used to determine N availability in the rhizosphere of fluffgrass. Ion exchange resin bags were used to determine NH4. 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). Two CA-bags were placed in the rhizosphere of a fluffgrass in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for NO3.

Data sources: 

data_JornadaStudy_385_fluff_grass_cation_exchange_resin_nh4

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385005

Abstract: 

An ion exchange resin bag technique (Binkley 1984, Lajtha 1988) was used to determine N availability in the rhizosphere of fluffgrass. Ion exchange resin bags were used to determine NO3. 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). 8 AN-bags were placed in the rhizosphere of a fluffgrass in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for NO3.

Data sources: 

data_JornadaStudy_385_fluff_grass_anion_exchange_resin_no3

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385004

Abstract: 

This data set consists of periodic size measurements of permanently marked individual fluff grass plants. Measurements were taken in March, July, and September 1986. 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.

Data sources: 

data_JornadaStudy_385_fluff_grass_plant_growth

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385003

Abstract: 

Dry weight biomass and total nitrogen were determined for flowers, green leaves and yellow and grey leaves of fluffgrass plants collected from 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).

Data sources: 

data_JornadaStudy_385_fluff_grass_plant_total_nitrogen

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385001

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.

Data sources: 

data_JornadaStudy_385_fluff_grass_mesocosm_mites_nematodes

LTER Core Area(s): 

Dataset: 

Study number: 

385

Data set ID: 

210385002

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]

Data sources: 

data_JornadaStudy_385_fluffgrass_rhizosphere_n_mineralization

LTER Core Area(s): 

Keywords: 

Dataset: 

Study number: 

368

Data set ID: 

210368004

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 sources: 

data_JornadaStudy_368_ant_nest_soil_water_content

LTER Core Area(s): 

Dataset: 

Study number: 

368

Data set ID: 

210368003

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 % organic matter of soils sampled in January 1987 from ant nests and adjacent reference sites.

Data sources: 

data_JornadaStudy_368_ant_nest_organic_matter

LTER Core Area(s): 

Dataset: 

Study number: 

368

Data set ID: 

210368002

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 sources: 

data_JornadaStudy_368_ant_nest_soil_nutrient

LTER Core Area(s): 

Dataset: 

Study number: 

368

Data set ID: 

210368001

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 density and cover of all winter annual plants measured at regular intervals. Density is expressed as the number of individuals of a species per square meter. The cover of each species was calculated as the area covered by a perpendicular (not vertical) projection of its aerial parts onto the ground surface and expressed in covered area (cm squared) per square meter.

Data sources: 

data_JornadaStudy_368_ant_nest_density_cover_winter_annual

LTER Core Area(s): 

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