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Dataset results
26 results for “NH4”
Elbrus Ice Core, Caucasus record of ammonia (NH4+)
<p><span>A deep ice core was drilled to bedrock (182.6 m) in 2009 on the western plateau of <span>Mount Elbrus </span>(ELB, 43°N, 42°E; 5115 m above sea level, asl) in the Caucasus (Russia).</span><span> </span><span>The upper 168.6 m (131.5 meters</span><span> </span><span>water equivalent, mwe) depth of the ice core were first dated by annual layer counting using pronounced seasonal variations in ammonium and succinate concentrations, both exhibiting well-marked winter minima (Mikhalenko et al., 2015; Preunkert et al., 2019). <span>Chemical measurements were done with a Dionex ICS-1000 chromatograph equipped with a CS12 separator column for cations </span>(Na<sup>+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup>, and NH<sub>4</sub><sup>+</sup>), a Dionex 600 equipped with an AS11 separator column for anions (Cl<sup>-</sup>, NO<sub>3</sub><sup>-</sup>, and SO<sub>4</sub><sup>2-</sup>) and light carboxylates. Detailed working conditions are given in Legrand et al. (2013). <span>Using the winter ammonium/succinate minima we determined half-year summer and winter means of of ammonia (NH4+) from 1748 to 2009.</span></span></p>
Post-fire succession in 1994 Hajdukovich Creek burn: Measurements of soil inorganic nitrogen supply (NO3- and NH4+)
This dataset contains soil NO3- and NH4+ supply measurements collected using PRS ion exchange probes. Measurements of inorganic N supply were collected separately in the organic and mineral soil layers. The probes were buried for two time periods (July - August, and August- September) in 2009.
Effects of microarthropod exclusion and water amendments on fluffgrass rhizosphere ammonium (NH4) at the Jornada Basin LTER, 1986-1987
This data package contains data on nitrogen availability (as ammonium, NH4+), measured with ion exchange resin bags, in fluffgrass (Dasyochloa pulchella) rhizosphere soil from 1986-1987. This study was conducted at the Chihuahuan Desert Rangeland Research Center to test how watering, and changing densities of soil microarthropods and nematodes, impacts fluffgrass growth and nutrient cycling. An ion exchange resin bag technique (Binkley 1984, Lajtha 1988) was used to determine ammonium availability. 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 (to exclude microarthropods), 2) Chlordane and water, 3) Water, and 4) Control. Two cation exchange bags were placed in the rhizosphere of a fluffgrass plant in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for available ammonium (NH4+) using a salicylate procedure. The data table contains bag collection date, treatment, and NH4+ (mg/kg) concentration. This study is complete.
Porewater nutrient concentration data [SRP, NH4+, S-2, Cl-] from several sites along the Rowley and Parker Rivers, MA and Wells NEER, ME.
Porewater nutrient concentration data [SRP, NH4+, S-2, Cl-] from several sites along the Rowley and Parker Rivers, MA and Wells NEER, ME.
Data-set of the partial pressure of CO2, dissolved concentrations of CH4, N2O, NO3-, NO2- and NH4+, specific conductivity and water temperature in the rivers and streams of the Napo River basin in Ecuador (2018, 2019, 2020, 2021)
<p>Data-set consists of two files:</p> <p>- data_ghgs.xlsx : Time-stamped and georeferenced data-set of the partial pressure of CO2 (pCO2 in ppm), dissolved CH4 concentration (CH4 in nmol/L), dissolved N2O concentration (N2O in nmol/L), specific (Sp.) conductivity (in µS/cm), water temperature (in °C), dissolved nitrate concentration (NO3- in µmol/L), dissolved nitrite concentration (NO2- in µmol/L), and dissolved ammonia concentration (NH4+ in µmol/L) in the rivers and streams of the Napo River basin in Ecuador (October 2018 and 2019, January 2019 and 2020, April 2019 and 2021, July 2019 and 2020). Gas measurements were made by headspace equilibration directly in the field with a infra-red gas analyser for CO2 and in the lab with a gas chromatograph for CH4 and N2O. NO3-, NO2- and NH4+ were measured with standard colometric procedures. Sampling and analytical protocols are provided here <a href="https://doi.org/10.5194/bg-16-3801-2019">https://doi.org/10.5194/bg-16-3801-2019</a></p> <p>- RiverATLAS.xlsx: hydro-environmental data for the sampled streams extracted from RiverATLAS (https://www.nature.com/articles/s41597-019-0300-6). Data codes and units are available here: https://data.hydrosheds.org/file/technical-documentation/HydroATLAS_TechDoc_v10_1.pdf</p> <p>First column of each of the two files provides station ID allowing to merge both data-sets.</p>
Data from: Fate of atmospherically deposited NH4+ and NO3- in two temperate forests in China: temporal pattern and redistribution
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NO3 and NH4 collected by resin bags in 15N addition plots during 2003-2004
Concentrations of NO3 and NH4 and d15N of NO3 and NH4 collected on resin bags from 15N addition plots along hillslope in Imnavait watershed.
Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts, Arctic LTER 1987 to 2002
Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts. This file complies data collected at different times from 1987 through 2001 and includes initial extracts taken for buried bag method of net nitrogen mineralization.
Extractable NH4-N and NO3-N (2 N KCl), PO4-P (0.025 N HCl) and pH (0.01 M CaCl2) were measured on soils from a transect along the Dalton road, Arctic LTER 1991.
Extractable NH4-N and NO3-N (2 N KCl), PO4-P (0.025 N HCl) and pH (0.01 M CaCl2) were measured on soils from a transect along the Dalton road. Sites are Gus Shaver flowering sites and Arctic LTER sites.
Plant available NH4, NO3, and PO4 was determined at three site (LTER Toolik acidic and nonacidic tundra and Sagwon acidic tundra) and three community combinations (tussock, watertrack, and snowbed) Arctic LTER 1997.
Plant available NH4, NO3, and PO4 was determined at three site (LTER Toolik acidic tundra, LTER Toolik nonacidic tundra, and Sagwon acidic tundra) and three community combinations (tussock, watertrack, and snowbed), three times during the season. pH was also determined in July and strong acid phosphorous in August.
Studies of NH4+ and NO3- uptake ability of subalpine plants and resource-use strategy identified by their functional traits
<p>Data for the preprint "Studies of NH4+ and NO3- uptake ability of subalpine plants and resource-use strategy identified by their functional traits.”, by Legay N. , Grassein F., Arnoldi C., Segura R., Laîné P., Lavorel S., Clément J.C.</p>
Effect of different feeding substrates on the production of in-sect-derived frass fertilizers for effective alleviation of ammonium (NH4+) toxicity - Raw Data and Supplementary Materials
<p>Raw data and Supplementary Materials for the submitted Article Titled: "Effect of different feeding substrates on the production of in-sect-derived frass fertilizers for effective alleviation of ammonium (NH4+) toxicity". Submitted to Agronomy-Basel MDPI. </p>
Col d'Olen, soil chemistry (extractable N-NH4) 2008-2019
<p>Dataset provides information about soil temperature, soil C and N dynamics at different sites in the alpine tundra, along an elevational gradient from 2500 to 2900 m asl during the period 2005-2018. The soil was sampled in triplicate in each the sites and the N-NH4 concentration is measured in soil K2SO4 extracts. The ongoing studies aimed at investigating how the meteorological variables affect the biogeochemistry of seasonally snow covered areas, with a special focus on the effect of the snow cover duration on soil and water C and N dynamics during the growing season.</p>
Data from: New insights into carbon acquisition and exchanges within the coral-dinoflagellate symbiosis under NH4+ and NO3- supply
Anthropogenic nutrient enrichment affects the biogeochemical cycles and nutrient stoichiometry of coastal ecosystems and is often associated with coral reef decline. However, the mechanisms by which dissolved inorganic nutrients, and especially nitrogen forms (ammonium versus nitrate) can disturb the association between corals and their symbiotic algae are subject to controversial debate. Here, we investigated the coral response to varying N : P ratios, with nitrate or ammonium as a nitrogen source. We showed significant differences in the carbon acquisition by the symbionts and its allocation within the symbiosis according to nutrient abundance, type and stoichiometry. In particular, under low phosphate concentration (0.05 µM), a 3 µM nitrate enrichment induced a significant decrease in carbon fixation rate and low values of carbon translocation, compared with control conditions (N : P = 0.5 : 0.05), while these processes were significantly enhanced when nitrate was replaced by ammonium. A combined enrichment in ammonium and phosphorus (N : P = 3 : 1) induced a shift in nutrient allocation to the symbionts, at the detriment of the host. Altogether, these results shed light into the effect of nutrient enrichment on reef corals. More broadly, they improve our understanding of the consequences of nutrient loading on reef ecosystems, which is urgently required to refine risk management strategies.
Data from: New insights into carbon acquisition and exchanges within the coral-dinoflagellate symbiosis under NH4+ and NO3- supply
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Data from: Species turnover (β diversity) in ectomycorrhizal fungi linked to NH4+ uptake capacity
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TROPESS Chemical Reanalysis Aerosol NH4 Monthly 3-dimensional Product V1 (TRPSCRAERNH4M3D) at GES DISC
The TROPESS Chemical Reanalysis Surface Aerosol NH4 Monthly 3-dimensional Product contains vertical concentrations of ammonium aerosols. The data are part of the Tropospheric Chemical Reanalysis v2 (TCR-2) for the period 2005-2021. TCR-2 uses JPL's Multi-mOdel Multi-cOnstituent Chemical (MOMO-Chem) data assimilation framework that simultaneously optimizes both concentrations and emissions of multiple species from multiple satellite sensors.The data files are written in the netCDF version 4 file format, and each file contains a year of data at monthly resolution, and a spatial resolution of 1.125 x 1.125 degrees at 27 pressure levels between 1000 and 60 hPa. The principal investigator for the TCR-2 data is Miyazaki, Kazuyuki.
TROPESS Chemical Reanalysis Aerosol NH4 6-Hourly 3-dimensional Product V1 (TRPSCRAERNH46H3D) at GES DISC
The TROPESS Chemical Reanalysis Surface Aerosol NH4 6-Hourly 3-dimensional Product contains vertical concentrations of ammonium aerosols. The data are part of the Tropospheric Chemical Reanalysis v2 (TCR-2) for the period 2005-2021. TCR-2 uses JPL's Multi-mOdel Multi-cOnstituent Chemical (MOMO-Chem) data assimilation framework that simultaneously optimizes both concentrations and emissions of multiple species from multiple satellite sensors.The data files are written in the netCDF version 4 file format, and each file contains a year of data at 6-hourly resolution, and a spatial resolution of 1.125 x 1.125 degrees at 27 pressure levels between 1000 and 60 hPa. The principal investigator for the TCR-2 data is Miyazaki, Kazuyuki.
TROPESS Chemical Reanalysis Surface Aerosol NH4 2-Hourly 2-dimensional Product V1 (TRPSCRAERNH42H2D) at GES DISC
The TROPESS Chemical Reanalysis Surface Aerosol NH4 2-Hourly 2-dimensional Product contains surface concentrations of ammonium aerosols. The data are part of the Tropospheric Chemical Reanalysis v2 (TCR-2) for the period 2005-2021. TCR-2 uses JPL's Multi-mOdel Multi-cOnstituent Chemical (MOMO-Chem) data assimilation framework that simultaneously optimizes both concentrations and emissions of multiple species from multiple satellite sensors.The data files are written in the netCDF version 4 file format, and each file contains a year of data at 2-hourly resolution, and a spatial resolution of 1.125 x 1.125 degrees. The principal investigator for the TCR-2 data is Miyazaki, Kazuyuki.
Col d'Olen, water chemistry (N-NH4) 2008-2019
<p>Dataset provides information about soil temperature, soil C and N dynamics at different sites in the alpine tundra, along an elevational gradient from 2500 to 2900 m asl during the period 2005-2018. Moreover, in ordrer to evaluate how topsoil can influence the quality of surface water, lake water was sampled monthly at the same time that soil was sampled. The N-NH4 concentration is measured in water samples collected in triplicate in two lakes (Cimalegna and Bowditch) from 2008 to 2019. The ongoing studies aimed at investigating how the meteorological variables affect the biogeochemistry of seasonally snow covered areas, with a special focus on the effect of the snow cover duration on soil and water C and N dynamics during the growing season.</p>
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