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5 results for “15N natural abundance”
Evaluating the impact of shade on Nitrogen fixation in sulla (Hedysarum coronarium L.): a 15N natural abundance study
<p>This dataset refers to the experimental raw data (csv version) collected within the trial reported in the concerned article on the following parameters:</p> <p>1. total nitrogen, delta N15, nitrogen derived from atmosphere, root biomass, nitrogen yield, nitrogen fixed, splitted per experiment, mowing, crop, treatment and replicate (15N_root.csv).</p> <p>2. total nitrogen, delta N15, nitrogen derived from atmosphere, shoot biomass, nitrogen yield, nitrogen fixed, splitted per experiment, mowing, crop, treatment and replicate (15N_shoot.csv).</p> <p>3. shoot cumulative nitrogen yield, root cumulative nitrogen yield, shoot cumulative nitrogen fixed, root cumulative nitrogen fixed, shoot:root ratio of nitrogen yield, shoot:root ratio of nitrogen fixed, splitted per experiment, treatment and replicate (shoot root ratio and N cumulative value.csv).</p>
Biomass %N, %C, natural abundance 15N and 13C isotopic signatures for common and rare under- and overstory plants in long unburned and burned (1999) boreal forest stands, Caribou-Poker Creek and Delta Junction
This dataset contains leaf, aboveground stem, and fruit carbon and N concentration and natural abundance isotope data for new and old tissue fractions of common and rare plant species in burned and unburned black spruce forest stands. Stands were located in either Caribou-Poker Creek or Delta Junction, in either unburned areas, or in areas burned in 1999 fires. Biomass was collected between 2000 and 2001 in mid-July at peak biomass.
Smartcow EU project database on feed efficiency in beef cattle and analysis of natural 15N abundance and plasma urea concentration
<p>This is a database built in the frame of the Smartcow H2020 Eu project (N°730924) and gathering individual raw data for animal performances obtained in thirteen beef cattle trials conducted in France, UK and Switzerland as well as animal values for two biomakers of feed efficiency : the natural 15N abundance in animal proteins (plasma or muscle) and plasma urea concentration. </p>
Natural 15N abundance of bulk soil N, ammonium, and nitrate in soil profiles
<p><span><span>Assessment of nitrogen (N) saturation of forests is critical to evaluate how ecosystems will respond to current and future global changes such as N deposition. However, quantifying N saturation remains a challenge. We developed a conceptual model of N saturation stages in forest ecosystems based on i) a hypothetical relative rate of ammonification, nitrification, and denitrification, ii) concentrations of ammonium and nitrate in the soil, and iii) <sup>15</sup>N enrichment pattern of bulk soil N, ammonium, and nitrate in the soil profile. We tested the hypotheses using the data from the five forests located at five sites across eastern Asia, including one boreal forest an dtwo temperate forests in northeastern China, one temperate forest in Japan, and one subtropical forest in south China. The fraction of nitrate in total inorganic N (TIN) indicated that the sites represent an N saturation gradient with one boreal forest being least saturated, three temperate forests moderately saturated, and the tropical forest most saturated. The δ<sup>15</sup>N of bulk soil N increased from topsoil to subsoil more sharply at N-limited sites than at the N-rich sites along the N deposition gradient. We also found distinct <sup>15</sup>N enrichment patterns of bulk soil N, ammonium, and nitrate in the soil profile across the study sites. At the least saturated forest, nitrate was more <sup>15</sup>N-depleted than ammonium only in the organic soil horizon indicating limited nitrification while the <sup>15</sup>N depletion of nitrate than ammonium was observed in the deeper mineral soil in the moderatley and most saturated forests. Furthermore, ammonium was more <sup>15</sup>N-depleted than bulk soil N in the least and moderately saturated forests but more <sup>15</sup>N-enriched than bulk soil N in the most saturated forest. Our study suggests that soil profile patterns of δ<sup>15</sup>N of bulk soil N, ammonium, and nitrate provide information about the relative rates of mineralization, nitrification, and denitrification, thus can be an additional measure of N saturation of forest ecosystem across broad environmental gradients.</span></span></p>
Natural 15N abundance of bulk soil N, ammonium, and nitrate in soil profiles
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