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Steven J Hall

Iowa State University | Assistant Professor

Subject Areas: Biogeochemistry

 Recent Activity

ABSTRACT:

Ion concentrations and precipitation amount were measured at 14 sites in the Salt Lake and Cache Valleys from December 2013 to February 2014. Sample collection was sporadic at several sites. The goal of this study was to identify land use impacts on nitrogen deposition to the iUTAH watersheds.

A subset of samples was analyzed for 15N and 18O of NO3 and 15N of NH4.

Methods and findings are described in the associated JGR-B manuscript

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ABSTRACT:

Stream and groundwater samples were collected irregularly from August 2013 to November 2014 for analysis of major ions by ion chromatography. Sites included the Red Butte Creek GAMUT stations. Please see the published manuscript in Environmental Science & Technology for further details on sampling methods and analyses of these data.

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ABSTRACT:

Here we report biogeochemical data from two sites in the Red Butte Creek watershed, Todd's Meadow in Red Butte Canyon, and Sage Pt. lawn on the U of Utah Canyon. GPS coordinates (WGS 84) for these sites are: 40.789, -111.796462 and 40.763, -111.830, respectively. Data were collected from 2013 - 14 in the context of a snow manipulation at both sites. See the attached document for details. Data include: surface soil moisture, temperature, and oxygen mixing ratios, extractable nitrogen (N) pools, total soil N, N in soil lysimeters, HCl-extractable soil iron, nitrate isotope composition, soil potential denitrification rates. A manuscript describing methods in detail is included.

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ABSTRACT:

This dataset reports the nitrogen isotope composition of leaves from 11 common riparian plant species collected from streams across the three iUTAH watersheds in October 2013 and July-August 2014. In addition, algae and moss samples were collected at many of the same sites on the Salt Lake Valley streams in September 2014. See the attached abstract and methods for more details.

Leaf samples were collected at 255 sites. Sites consisted of a ~ 30 m transect parallel to the stream, including both sides of the stream when possible. We sampled leaves from up to 11 species representative of the local flora when present (see spreadsheet for species names). Plants were only sampled if they were in close proximity (< 2 m) of the perennial channel or were visibly rooted in the stream. At each site, we collected 5 – 15 leaves from each species, including a mixture of mature sun and shade leaves from all parts of the plant. Where multiple individuals of the same species were present at the same site, we sampled leaves from up to five individuals, which were then composited by species. We sampled Salt Lake Valley sites during late September / early October 2013, and Cache and Heber Valley sites in late July 2014.

Please approach the algae/moss carbon isotope data with caution as carbonates were not removed prior to analysis; however, samples were thoroughly rinsed in deionized water to remove associated sediment.

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Generic Generic

ABSTRACT:

This dataset reports the nitrogen isotope composition of leaves from 11 common riparian plant species collected from streams across the three iUTAH watersheds in October 2013 and July-August 2014. In addition, algae and moss samples were collected at many of the same sites on the Salt Lake Valley streams in September 2014. See the attached abstract and methods for more details.

Leaf samples were collected at 255 sites. Sites consisted of a ~ 30 m transect parallel to the stream, including both sides of the stream when possible. We sampled leaves from up to 11 species representative of the local flora when present (see spreadsheet for species names). Plants were only sampled if they were in close proximity (< 2 m) of the perennial channel or were visibly rooted in the stream. At each site, we collected 5 – 15 leaves from each species, including a mixture of mature sun and shade leaves from all parts of the plant. Where multiple individuals of the same species were present at the same site, we sampled leaves from up to five individuals, which were then composited by species. We sampled Salt Lake Valley sites during late September / early October 2013, and Cache and Heber Valley sites in late July 2014.

Please approach the algae/moss carbon isotope data with caution as carbonates were not removed prior to analysis; however, samples were thoroughly rinsed in deionized water to remove associated sediment.

Show More
Generic Generic
Red Butte Canyon meadow and lawn soil biogeochemical data
Created: July 16, 2016, 9:06 p.m.
Authors: Steven Hall

ABSTRACT:

Here we report biogeochemical data from two sites in the Red Butte Creek watershed, Todd's Meadow in Red Butte Canyon, and Sage Pt. lawn on the U of Utah Canyon. GPS coordinates (WGS 84) for these sites are: 40.789, -111.796462 and 40.763, -111.830, respectively. Data were collected from 2013 - 14 in the context of a snow manipulation at both sites. See the attached document for details. Data include: surface soil moisture, temperature, and oxygen mixing ratios, extractable nitrogen (N) pools, total soil N, N in soil lysimeters, HCl-extractable soil iron, nitrate isotope composition, soil potential denitrification rates. A manuscript describing methods in detail is included.

Show More
Generic Generic
Red Butte Creek stream and groundwater ion concentrations
Created: July 18, 2016, 8:11 p.m.
Authors: Steven Hall

ABSTRACT:

Stream and groundwater samples were collected irregularly from August 2013 to November 2014 for analysis of major ions by ion chromatography. Sites included the Red Butte Creek GAMUT stations. Please see the published manuscript in Environmental Science & Technology for further details on sampling methods and analyses of these data.

Show More
Generic Generic

ABSTRACT:

Ion concentrations and precipitation amount were measured at 14 sites in the Salt Lake and Cache Valleys from December 2013 to February 2014. Sample collection was sporadic at several sites. The goal of this study was to identify land use impacts on nitrogen deposition to the iUTAH watersheds.

A subset of samples was analyzed for 15N and 18O of NO3 and 15N of NH4.

Methods and findings are described in the associated JGR-B manuscript

Show More