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17 results for “nitrogen load”
Water quality data (River sediment, Nitrogen and Phosphorus loads) for Africa
<p>Output data on African water quality and scripts for preprint - "One third of African rivers fail to meet the 'good ambient water quality' nutrient targets" at <a href="https://dx.doi.org/10.2139/ssrn.4829742">https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4829742</a> . Please check the readme file for data description. The data includes river flow, sediment load, nitrogen and Phosphorus loads for Africa at daily and yearly time scale. This work is currently under review in Ecological Indicators journal. </p>
Nitrogen cycling and metabolic rates of aquacultured and wild Acropora coral from Guam in response to ammonium loading rates during 2020-2022
Rates from aquacultured corals and coral fragments collected in Guam in response to ammonium loading. These data are from two separate experiments, one using aquacultured corals and artificial seawater and light. The second was done with wild collected Acropora pistillata from two reef sites in Guam. The first site was West Hagåtña Bay (N13.479650, E144.741750; N13.479833, E144.741733) which had more nearby urban influences and was near the sewage outfall for the city (Redding et al. 2013). The second site was Luminao Reef (N13.4652417, E144.6477483; N13.465467, E144.648050) which was a more isolated reef on the seaward side of the breakwater for Guam’s major port. We measured respiration, gross primary production, 15N ammonium uptake to corals, related nitrogen cycling fluxes in the tanks (reminerization, net uptake, nitrification).
Annual estimates of nitrogen loading to the Ipswich River Watershed, 1931 - 2014.
The nitrogen budget of the Ipswich River watershed was reconstructed to explore trends over time, 1931 to 2014, in gross N inputs, net N inputs, riverine exports.Various sources were used to reconstruct major N budget terms for atmospheric deposition, fertilizer, food imports, sewage N exports, riverine N exports.
Data for: Nitrogen deposition in forests: Statistical modeling of total deposition from throughfall loads
<p><strong>Introduction:</strong> Nitrogen (N) gradient studies in some cases use N deposition in throughfall as measure of N deposition to forests. For evaluating critical loads of N, however, information on total N deposition is required, i.e., the sum of estimates of dry, wet and occult deposition.</p> <p><strong>Methods: </strong>The present paper collects a number of studies in Europe where throughfall and total N deposition were compared in different forest types. From this dataset a function was derived which allows to estimate total N deposition from throughfall N deposition.</p> <p><strong>Results: </strong>At low throughfall N deposition values, the proportion of canopy uptake is high and thus the underestimation of total deposition by throughfall N needs to be corrected. At throughfall N deposition values >20 kg N ha<sup>-1</sup> yr<sup>-1</sup> canopy uptake is getting less important.</p> <p><strong>Conclusions: </strong>This work shows that throughfall clearly underestimates total deposition of nitrogen. With the present data set covering large parts of Europe it is possible to derive a critical load estimate from gradient studies using throughfall data.</p>
Monthly nitrogen point-source loading dataset for the Long Island Sound Watershed
<p>The attached dataset and code accompanies a Data in Brief article, "Monthly nitrogen point-source loading dataset for the Long Island Sound Watershed."</p> <p>Abstract: Quantifying point source nitrogen loads to the Long Island Sound watershed is important because they contribute to the annual occurrence of hypoxia in Long Island Sound. However, the data are not easily accessible and are not available at a central location, making it difficult to characterize the magnitude of loading, seasonal patterns and long-term trends. For the period between April 1989 and September 2021, we gathered all available monthly nitrogen data for wastewater treatment plants within the Long Island Sound watershed from the U.S. Environmental Protection Agency Integrated Compliance Information System-National Pollutant Discharge Elimination System (ICIS-NPDES) and Permit Compliance System, and Connecticut Department of Energy and Environmental Protection databases. Data were checked for quality assurance and unreasonable outliers were imputed with means of other observations within the same year and season. Estimates were also imputed for missing observations. We publish both raw data with missing observations and a curated dataset with imputed estimates for missing observations. Monthly point source nitrogen load data can be used for water quality modeling and to infer, by subtraction, the relative contribution of nonpoint sources to gauged watershed loads. Additionally, the scripts used to reformat data from the ICIS could be repurposed to collect similar data in other regions.</p>
Data for: Nitrogen deposition in forests: Statistical modeling of total deposition from throughfall loads
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Global Water Quality Data: Historical Nitrogen and Phosphorus Loads and Concentrations Simulated by CoSWAT-WQ v1.0
<p>Output data on global TN and TP water quality and scripts for the historical period (1995 - 2016) generated by CoSWAT-WQ v1.0. Please check the readme file for data description. The data includes river flow, , nitrogen and Phosphorus loads and concetrations at monthly timestep.</p>
Global warming enhances nitrogen-limitation in a temperate reservoir system under consistent external load.
<p>Data belonging to AGU<em>:Water Resources Research</em> submission:</p> <p>Global warming and continued external loading increase nitrogen limitation in a temperate reservoir system.</p> <p>Climate change impacts hydrology, geochemistry, and biology of lakes and reservoirs worldwide, also affecting surface water concentrations of the essential nutrients nitrogen (N) and phosphorus (P). Few studies have illustrated climate change’s impact on nutrient processing due to compounded effects of both climate change and catchment inputs. In this study, we have evaluated monitoring data from the years 2000 to 2019 in the Franconian Lake District (FLD), which consists of one shallow (hypertrophic) and three deep reservoirs (meso- to eutrophic), interconnected by a transfer canal. The cascade configuration and consistent external load buffer catchment variations, making nutrient trends attributable to internal processing. Mass balances were set up and statistical analyses were conducted for trends in stratification, hypolimnetic anoxia and nutrient concentrations. Warming significantly increased water temperature (+0.35-1.0°C decade<sup>−1</sup> ), stratification (+7-18 days decade<sup>−1</sup>), and hypolimnetic anoxia (+15-35 days decade<sup>−1</sup>). TP increased in deep reservoirs (+0.006-0.01 mg-P L<sup>−1</sup> decade<sup>−1</sup> ) and TN decreased in all reservoirs (−0.2-0.4 mg-N L<sup>−1</sup> decade<sup>−1</sup> ). The increased rates of NO<sub>3</sub>-loss could be related to enhanced denitrification rates and earlier algal uptake. Increased TP-concentrations were attributable to increased sediment P-release, induced by prolonged stratification and hypolimnetic anoxia. Primarily, the decrease in TN drove a strong decrease in TN:TP-ratio (-4 to -15 mol:mol decade<sup>−1</sup>), triggering a biogeochemical regime shift towards N-limitation, associated with proliferation of harmful algae blooms. The identified impacts emphasizes the need to consider the potential disruptive effects of intensifying climate change on the health and restoration efforts for temperate, eutrophic lakes worldwide.</p>
Data from: Variations in ratio and loads of soil nitrogen and phosphorus explain the coexistence of dominant tree species in a boreal forest of Xinjiang, northwest China
<p><span>The resource ratio hypothesis (RRH) and the nutrient-load hypothesis (NLH) state that species coexistence is driven by the ratios and loads (contents) of multiple limiting resources, respectively. However, roles of resource ratios and loads to mature forest ecosystems remains unclear. Data were collected within 300 quadrats (20m×20m) spread across a 12 ha plot of boreal forest in the Kanas of Xinjiang, northwest China. We used torus translation tests to analyze the associations of dominant tree species with specific microhabitats. The linear mixed models were used to assess effects of resource ratios and contents on abundance and basal area of specific species, as well as within different life stages. Two shade-tolerant species, <i>Picea obovata</i> and <i>Pinus sibirica</i>, exhibited opposite relationships to the spatial distribution of soil nitrogen (N) content and phosphorus (P) content. <i>Picea. obovata</i> was associated with microhabitats with high N:P ratio, while <i>P. sibirica</i> preferred microhabitats with low N:P ratio. The light-demanding trees, <i>Betula pendula</i> clustered at both low N and P sites. Another light-demanding trees, <i>Larix sibirica</i>, did not show any significant habitat preferences. Moreover, N:P ratio mainly affected species abundance, while their contents largely impacted basal area of species. And effects of N:P ratio or contents on species distribution showed a decreasing trend from sapling to adults. Overall, our findings indicate that niche partitioning caused by resource variations may alleviate interspecific competition and contribute to the species coexistence, providing convincing proof for the importance of resource ratio and load on maintaining diversity in boreal forests. </span></p>
Data from: Variations in ratio and loads of soil nitrogen and phosphorus explain the coexistence of dominant tree species in a boreal forest of Xinjiang, northwest China
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Data from: Host and tissue variation overshadow the response of boreal moss-associated fungal communities to increased nitrogen load
Human activity has more than doubled the amount of nitrogen entering the global nitrogen cycle, and the boreal forest biome is a nitrogen-limited ecosystem sensitive to nitrogen load perturbation. Although bryophyte-associated microbes contribute significantly to boreal forest ecosystem function, particularly in carbon and nitrogen cycling, little is known about their responses to anthropogenic global change. Amplicon pyrosequencing of the ITS2 region of rDNA was used to investigate how fungal communities associated with three bryophyte species responded to increased nitrogen loads in a long-term fertilization experiment in a boreal Picea abies forest in southern Norway. Overall, OTU richness, community composition, and the relative abundance of specific ecological guilds were primarily influenced by host species identity and tissue-type. Although not the primary factor affecting fungal communities, nitrogen addition did impact the abundance of specific guilds of fungi and the resulting overall community composition. Increased nitrogen loads decreased ectomycorrhizal abundance, with Amphinema, Cortinarius, Russula, and Tylospora OTUs responding negatively to fertilization. Pathogen abundance increased with fertilization, particularly in the moss pathogen Eocronartium. Saprophytic fungi were both positively and negatively impacted by the nitrogen addition, indicating a complex community level response. The overshadowing of the effects of increased nitrogen loads by variation related to host and tissue-type highlights the complexity of bryophyte-associated microbial communities and the intricate nature of their responses to anthropogenic global change.
Data from: Nitrogen loads influence trophic organization of estuarine fish assemblages
Nutrient (N and P) loading may affect functioning in aquatic ecosystems by restructuring producer assemblages with flow-on effects to consumers. Trophic niche occupancy and trophic organization of consumers are key components of ecosystem function that have been increasingly investigated using quantitative isotopic niche indices. These indices are based on the premise that the isotopic values of consumer tissues indicate their assimilated diet. Typically, isotopic niche indices are calculated using only consumer isotope data, which limit their application for spatial and temporal comparisons because consumer isotopic niches depend on isotopic variability of available autotrophs. We used measures of isotopic variability of autotrophs to standardize isotopic niche indices, which enabled us to compare trophic organization of fish assemblages in nine estuaries spanning a broad range of nutrient loading. We related standardized isotopic niche indices of fish assemblages to nitrogen and phosphorous loads and hydrological flushing of the estuaries in autumn and spring. The estuarine fish assemblages studied here showed greater trophic diversity and less redundancy given moderate to high inorganic nitrogen loading. Taxonomic richness partly influenced three isotopic niche indices measuring trophic diversity, but not measures of redundancy. Similar patterns may occur in other systems in which nitrogen loads have increased but the diversity of primary producers has not been reduced to a single dominant source. Our results demonstrate bottom-up controls of estuarine food webs. Effects of inorganic nitrogen loading were transmitted upwards through the food web to affect the trophic organization of higher trophic levels, demonstrating the crucial role of nitrogen for estuarine trophic dynamics.
Data used to study the short-term effects of hurricane Ida on nitrate-nitrogen runoff loading using E3SM land model
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Chapter 3. Contrasting methane, sulfide, and nitrogen loading regimes in bioreactors shape microbial communities originating from methane-rich coastal sediment of the Stockholm Archipelago
<p>Supplementary Tables 1 to 7.</p> <p> </p>
Data from: Nitrogen loads influence trophic organization of estuarine fish assemblages
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Data from: Host and tissue variation overshadow the response of boreal moss-associated fungal communities to increased nitrogen load
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Organic matter loading modifies the microbial community responsible for nitrogen loss in estuarine sediments
GEO Series GSE65430. synthetic construct; aquatic metagenome. 4 samples. Type: Other.
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