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28 results for “inorganic nitrogen”
Organic and Inorganic Nitrogen Uptake by Sarracenia Purpurea at Harvard Forest and Fort Albany ON 2007
The nitrogen-limited carnivorous pitcher plant Sarracenia purpurea and its associated detritus-based food web is a model system for studying plant nutrient dynamics. We tested if S. purpurea can directly take up intact amino acids and compared uptake of organic and inorganic forms of nitrogen (N) across a gradient of N deposition. At sites in Canada and the United States, individual pitchers with complete or incomplete food webs were fed U-13C-15N-glycine, U-13C-15N-phenylalanine and 15NH415NO3 individually and in mixture. Plants took up intact amino acids. Acquisition of each N form provided in isolation exceeded uptake of the same form in mixture. At the high deposition site, uptake of 15N from amino acids was higher than uptake of 15N from inorganic nitrogen. At the low deposition site, uptake of 15N from all three forms of N were similar. Completeness of the associated food web had no effect on 15N uptake. By taking up intact amino acids, Sarracenia purpurea can short-circuit the inorganic N cycle, thus minimizing potential bottlenecks in N availability that result from the plant’s reliance for nitrogen mineralization on a seasonally reconstructed food web operating on infrequent and irregular prey capture.
Inorganic Nitrogen Pools and Tree Composition in Hemlock Removal Experiment at Harvard Forest 2007-2009
This study assessed how the change in leaf litter input and environmental conditions, from that of hemlock stands to earlier successional deciduous stands, will affect inorganic nitrogen availability at the interface of the mineral soil and LFH horizons. In early October 2007 we exchanged 0.5 x 0.5 m "loaves" of LFH horizons from hemlock and deciduous stands between forest types, while keeping control plots in the original forest stands. Inorganic nitrogen outputs from the litter loaves were monitored for 20 months using ion-exchange resins, removing and replacing the resins three times at 5 - 8 month intervals. Results indicated that there were differences between the control hemlock and deciduous loaves - NO3 and NH4 availability were higher in deciduous stands. However, the transfer of litter loaves from one stand type to another did not reveal changes in nutrient availability due to a shift in habitat. Rather, the methodology of moving litter loaves to a new site caused greater changes in nutrient availability, particularly over the summer months.
NEON soil inorganic nitrogen measurements 2017-2020, derived data and code for Earth's Future manuscript
Nitrogen (N) is a key limiting nutrient in terrestrial ecosystems, but there remain critical gaps in our ability to predict and model controls on soil N cycling. This may be in part due to lack of standardized sampling across broad spatial-temporal scales. In a paper submitted for publication in Earth's future, we introduce a continentally distributed, publicly available dataset collected by the National Ecological Observatory Network (NEON) that can help fill these gaps. To overcome methodological challenges and generate a standardized dataset, we produced a derived data version of soil inorganic N pools and net N transformation rate tables, which accounts for nitrite contamination in blanks. This derived dataset is then used to evaluate sources of variation within the NEON sampling design with mixed effects models, and we also compare measured net N mineralization to simulated fluxes from the Community Earth System Model 2 (CESM2).
Soil Inorganic Nitrogen on the Main Cropping System Experiment at the Kellogg Biological Station, Hickory Corners, MI (1989 to 2018)
Dataset AbstractMeasurement of soil inorganic nitrogen began in 1989 for all treatments on the LTER Main Site and 1993 on the Successional and Forest sites. Ammonium and nitrate are analyzed twice monthly or monthly during the growing season on baseline soil samplings. Additional datasets from the Baseline Soil Samplings include soil moisture, total N and total C.original data source http://lter.kbs.msu.edu/datasets/24
Rapid root to leaf uptake of inorganic and amino acid nitrogen in three dryland plant species.
Our aim was to quantify inorganic and organic nitrogen (N) uptake and compare short-term nutrient acquisition patterns among three dryland plant species: Bouteloua eriopoda, Achnatherum hymenoides, and Gutierrezia sarothrae collected from a mixed grassland community in the Northern Chihuahuan Desert to better understand how asynchronous resource availability may influence biotic interactions and nutrient retention in these ecosystems. We collected living plants from two locations within the Sevilleta National Wildlife Refuge and transplanted them into pots maintained in the greenhouse with supplemental light and water for two months. We then conducted a greenhouse experiment using these species to compare nutrient uptake of 15N-labeled ammonium (NH4+), nitrate (NO3-), and glutamate (an amino acid) over 12 to 48 hours. Our study examined three main questions: (1) How rapidly do these dryland plants take up available soil N?, (2) Does leaf uptake differ among inorganic and amino acid N forms?, and (3) Do plant species differ in the speed or form of short-term N uptake?. In the greenhouse, we applied one of three isotopic 15N tracers directly to plant roots and quantified N uptake and recovery in leaves after 12, 24, and 48 hours. We found that plants took up inorganic and amino acid N to leaves as rapidly as 12 h following application, and N uptake more than doubled between 24 and 48 h. Inorganic N uptake was 3-4x higher than organic N uptake in all three species, and plants took up ammonium and nitrate at 2-3x faster rates than glutamate. On average, B. eriopoda had higher inorganic N recovery and uptake speeds, while G. sarothrae had the highest organic N uptake over time. A. hymenoides root to leaf uptake was ~50% lower than the other two species after 48 h. Plants showed similar patterns of short-term foliar uptake and recovery indicating a lack of niche partitioning by N form among the three dryland species measured. Our results suggest that soil inorganic N, par
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.
Post-fire succession in 1994 Hajdukovich Creek Burn: in-situ measurements of aspen and spruce inorganic nitrogen uptake rates
This dataset contains in-situ measurements of inorganic nitrogen uptake rates in aspen and spruce saplings regenerating in one severely and one lightly burned site in the 1994 Hajdukovich Creek burn.
Figure 1 in Relative uptake of organic and inorganic nitrogen by common weed species
Figure 1. Estimated intact amino acid uptake (root) and translocation (shoot) plotted against the excess 15N (atom percent excess 15N [15N APE]) found in each respective tissue type (amino acid 15N treatment only) for each weed species. Whole amino acid uptake and translocation were calculated by dividing the observed 15N:13C in plant tissue with the measured 15N:13C in the dual-labeled fertilizer. Data are means ± SE (n = 5). See Table 1 for list of full species names.
Figure 2 in Relative uptake of organic and inorganic nitrogen by common weed species
Figure 2. Canonical plot displaying the results of a linear discriminant analysis evaluating patterns in 15N uptake by species (Wilks's lambda = 0.0157, F(42, 83) = 2.8227, P <0.0001). The first two canonical axes were the most explanatory, accounting for 66.9% and 19.7% of the model variation. Species multivariate means (þ symbols) are surrounded by 95% confidence ellipses. Weighted biplots of N form by tissue atom percent excess 15N (15N APE) values are emanating from the grand mean of the data set, and their length and direction indicate the relative strength of their correlation with the first two axes. See Table 1 for list of full species names.
Inorganic nitrogen, microbial ecoenzymatic activities, and organic matter in soils collected from the Monsoon Rainfall Manipulation Experiment (MRME), Sevilleta National Wildlife Refuge, New Mexico during the 2014 growing season
Drylands are characterized by a pulse dynamics framework in which episodic rain events trigger brief pulses of biological activity and resource availability that regulate primary production in these ecosystems. Relatively small rain events can stimulate microbial processes like decomposition that release inorganic nitrogen needed by plant processes, which typically also depend on soil moisture received from larger rain events. Little is known how changes in rainfall patterns may affect plant available nitrogen in dryland soils, particularly across temporal scales. Therefore, we conducted a study to examine the daily and seasonal responses of plant available nitrogen to rain events that differed in size and frequency throughout a summer monsoon in a northern Chihuahuan Desert grassland located in the Sevilleta National Wildlife Refuge, New Mexico, USA. This data package, which accompanies an associated manuscript (Brown et al. 2022), contains measurements of inorganic nitrogen, nitrogen-acquiring microbial ecoenzymatic activities, and organic matter in soils collected from the Monsoon Rainfall Manipulation Experiment (MRME) during the 2014 summer growing season.
Inorganic Nitrogen and phosphorus were analyzed on snow samples taken from two snow pits near the long-term acrtic LTER mesic acidic tussock experimental plots Toolik Field Station 2003
Inorganic Nitrogen and phosphorus were analyzed on snow samples taken from two snow pits near the long-term acrtic LTER mesic acidic tussock experimental plots. The snow layers in each pit were described and sampled separtely with the help of Matthrew Sturm.
Concentration of dissolved inorganic carbon (DIC), carbon and nitrogen concentrations, C:N ratios and del 13C isotope value for lakes and rivers on North Slope from Brooks Range to Prudhoe Bay, Arctic LTER 1988 to 2005
Composite file describing plant, animal, water, and sediment samples collected at various sites near Toolik Research Station (68 38'N, 149 36'W). Sample site descriptors include an assigned number specific to the file, a number that relates the samples to other samples collected on the same date and time (sortchem), site, date, time, and depth. Samples are identified by type, category, and a short description. Data include isotope values, carbon and nitrogen concentrations, and C:N ratios of samples.
The effects of nitrogen and warming on inorganic nitrogen pool and production rates in arctic and boreal ecosystems: inorganic nitrogen transformation during a 3-month laboratory incubation
We incubated (2006) northern Alaskan soils (boreal and tundra) at two temperatures (5 degC and 15 degC) and two levels of nitrogen addition (with and without) to directly test for nitrogen limitation of inorganic nitrogen production rate and explore the interaction between temperature and nitrogen limitation. Over the 3-month laboratory incubation, we measured initial extratable inorganic nitrogen and inorganic nitrogen production rates from organic and mineral soils from four different ecosystem types (boreal burned, boreal unburned, moist acidic, moist non-acidic). To charactarize the soils, we also measured total C, total N, microbial biomass, isotopes values (delta 13, delta14), total free amino acid, and total soluble protein.
McMurdo Dry Valleys Dissolved Inorganic Nitrogen Concentrations in Lakes
The McMurdo Long Term Ecological Research (LTER) project monitors patterns of inorganic material transport in perennial ice-capped lakes. This data set addresses this core area of research and quantifies dissolved inorganic nitrogen concentrations at specific depths in McMurdo Dry Valley lakes.
SBC LTER: Beach: Data to support "Contribution of macroalgal wrack consumers to dissolved inorganic nitrogen concentrations in intertidal pore waters of sandy beaches"
These data describe measures of excretion from talitrid amphipods (Megalorchestia corniculata) fed giant kelp (Macrocystis pyrifera) blades and incubated in a series of mesocosms during May 2018. Data are contained in one table: time series of mesocosm porewater nutrient concentrations measured twice daily for approximately one week (two full trials included in this dataset). This dataset is to support the article: Lowman, H. E., Emery, K. A., Kubler-Dudgeon, L., Dugan, J. E., & Melack, J. M. (2019). Contribution of macroalgal wrack consumers to dissolved inorganic nitrogen concentrations in intertidal pore waters of sandy beaches. Estuarine, Coastal and Shelf Science. https://doi.org/10.1016/j.ecss.2019.02.004
Regime shift in secondary inorganic aerosol formation and nitrogen deposition in the rural US
<p>Secondary inorganic aerosols (SIA) play an important role in air pollution and climate change, and their formation modulates atmospheric deposition of reactive nitrogen (N<sub>r</sub>; including oxidized and reduced nitrogen), impacting the nitrogen cycle. Large-scale and long-term analyses of SIA formation based on model simulations have significant uncertainties. Here, we improve constraints on SIA formation using decade-long in-situ observations of aerosol composition and gaseous precursors from multiple monitoring networks across the US. We reveal a shift in the formation regime of SIA in the rural US between 2011 – 2020, making rural areas less sensitive to changes in ammonia (NH<sub>3</sub>) concentrations and shortening the effective atmospheric lifetime of reduced forms of N<sub>r</sub>.<sub> </sub>This leads to potential increases in N<sub>r</sub> deposition near NH<sub>3</sub> emission hotspots, with ecosystem impacts warranting further investigation. NH<sub>3</sub>, a critical but not directly regulated precursor of fine particulate matter (PM<sub>2.5</sub>) in the US, has been increasingly scrutinized to decrease PM<sub>2.5</sub>. Our findings, however, show controlling NH<sub>3</sub> became significantly less effective for mitigating PM<sub>2.5</sub> in the rural US. We highlight the need for more collocated aerosol and precursor observations for better characterization of SIA formation in urban areas and regions increasingly impacted by wildfires and dust.</p>
Vegetative biomass production under different inorganic nitrogen forms of the USDA rice (Oryza sativa L.) diversity panel 1
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Regime shift in secondary inorganic aerosol formation and nitrogen deposition in the rural US
Open the record for dataset details and reuse information.
Stream Chemistry / Dissolved Inorganic Nitrogen
As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a systematic aqueous geochemical sampling program has been undertaken. A series of terrestrial water samples have been collected and analyzed for dissolved inorganic nitrogen levels. This dataset shows concentrations of dissolved inorganic nitrogen found in various streams of the McMurdo Dry Valleys.
Data from: Widely naturalized species are not more promiscuous in the use of different nitrogen forms, but benefit more from inorganic nitrogen
<p>Nitrogen (N) has been considered a crucial factor influencing invasion success. Many studies have assessed responses of alien plants to different N availabilities. However, in natural soils, N comes in different forms. Few studies have explored yet whether responses of alien species to different N forms are related to their naturalization success globally. </p> <p>We selected 22 common herbaceous species native to Germany that have all become naturalized elsewhere in the world. We grew them under six different N conditions that differed in the availability or form of N, and assessed their growth performance.</p> <p>We found that neither biomass production nor promiscuity to different N forms was related to naturalization success of the species. However, the biomass response to inorganic N, relative to organic N, was stronger for the widely naturalized species than for the less widely naturalized ones.</p> <p>Our comparative multi-species study shows that although the widely naturalized species were not more promiscuous than the less widely naturalized species, they took more advantage of the inorganic-N forms. This indicates that naturalization success might be partly driven by a species' ability to take advantage of increased inorganic N levels.</p>
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International Brain Laboratory public data
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OpenNeuro
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