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33 results for “Nitrogen uptake”
Ensemble projections elucidate effects of uncertainty in terrestrial nitrogen limitation on future carbon uptake
<p>Simulation output as described in Meyerholt, J., Sickel K., and Zaehle, S., (2020), Ensemble projections elucidate effects of uncertainty in terrestrial nitrogen limitation on future carbon uptake, Global Change Biology, doi:10.1111/gcb.15114</p> <p>Data in the file <a href="https://zenodo.org/api/files/62e7c4a2-96e9-46b8-810f-c4c3c24b06c0/ocn4magicc_carbon_model.nc?versionId=cb25734e-52ce-42fa-b238-9b7192baf4dd">ocn4magicc_carbon_model.nc</a> describe the carbon-only version of the model, <a href="https://zenodo.org/api/files/62e7c4a2-96e9-46b8-810f-c4c3c24b06c0/ocn4magicc_carbon_model.nc?versionId=cb25734e-52ce-42fa-b238-9b7192baf4dd">ocn4magicc_nitrogen_models.nc </a>describe the carbon-nitrogen model outputs.</p>
The seasonal cycle of nitrogen uptake and nitrification in the Atlantic sector of the Southern Ocean
<p>This data set shows winter and summer nitrogen (nitrate and ammonium) uptake, net primary production, and nitrification (ammonium and nitrite oxidation) rates from the upper 200 m of the Atlantic sector of the Southern Ocean.</p> <p> </p>
Data from: Growth and nitrogen uptake characteristics reveal outbreak mechanism of the opportunistic macroalga Gracilaria tenuistipitata
Macroalgae has bloomed in the brackish lake of Shenzhen Bay, China continuously from 2010 to 2014. Gracilaria tenuistipitata was identified as the causative macroalgal species. The aim of this study was to explore the outbreak mechanism of G. tenuistipitata, by studying the effects of salinity and nitrogen sources on growth, and the different nitrogen sources uptake characteristic. Our experimental design was based on environmental conditions observed in the bloom areas, and these main factors were simulated in the laboratory. Results showed that salinity 12 to 20 ‰ was suitable for G. tenuistipitata growth. When the nitrogen sources' (NH4+, NO3−) concentrations reached 40 µM or above, the growth rate of G. tenuistipitata was significantly higher. Algal biomass was higher (approximately 1.4 times) when cultured with NH4+ than that with NO3− addition. Coincidentally, macroalgal bloom formed during times of moderate salinity (~12 ‰) and high nitrogen conditions. The NH4+ and NO3− uptake characteristic was studied to understand the potential mechanism of G. tenuistipitata bloom. NH4+ uptake was best described by a linear, rate-unsaturated response, with the slope decreasing with time intervals. In contrast, NO3− uptake followed a rate-saturating mechanism best described by the Michaelis-Menten model, with kinetic parameters Vmax = 37.2 µM g−1 DM h−1 and Ks = 61.5 µM. Further, based on the isotope 15N tracer method, we found that 15N from NH4+ accumulated faster and reached an atom% twice than that of 15N from NO3−, suggesting when both NH4+ and NO3− were available, NH4+ was assimilated more rapidly. The results of the present study indicate that in the estuarine environment, the combination of moderate salinity with high ammonium may stimulate bloom formation.
Data used to generate figures in 'Autotrophic Dissolved Organic Phosphorus Uptake Stimulates Nitrogen Fixation in Subtropical Gyres'
<p>Data used to generate figures in '<strong><span>Autotrophic Dissolved Organic Phosphorus Uptake Stimulates Nitrogen Fixation in Subtropical Gyres</span></strong>' by Shen and Wang</p> <p> </p> <p><span>Figure2.mat</span></p> <p><span>up2d: Integrated Euphotic Zone’s DOP uptake rate (mmol P m^{-2} yr^{-1}) (Fig. 2a)</span></p> <p><span>per: Contribution percentage of DOP uptake to net primary production(NPP) (Fig. 2b)</span></p> <p><span> </span></p> <p><span>Figure3.mat</span></p> <p><span>NFtmp: Global distribution of microbial N<sub>2</sub> fixation rate (mmol N m^{-2} yr^{-1}) (Fig. 3a)</span></p> <p><span>fn2p: </span><span>N:P of exported material from euphotic zone (Fig. 3b)</span></p> <p><span>NFdif: N<sub>2</sub> fixation anomaly (mmol N m^{-2} yr^{-1}) (Fig. 3c)</span></p> <p><span>difper: N<sub>2</sub> fixation anomaly in percentage (Fig. 3d)</span></p> <p><span> </span></p> <p><span>Figure4.mat</span></p> <p><span>rdop: </span><span>Contribution of newly fixed N to export production (Fig. 4a)</span></p> <p><span>dif: Anomaly of contributions of newly fixed N to export production (Fig. 4b)</span></p> <p><span>mass2d: </span><span>Annual Net Community Production (mg C m^{-2} day^{-1}) (Fig.4c)</span></p>
Uptake of nitrogen forms by diploid and triploid white poplar depends on seasonal carbon use strategy and elevated summer ozone
<p>This dataset contains data from an experiment described in the paper: "Miaomiao Wang, Guolei Li, Zhaozhong Feng, Yong Liu, Yansen Xu, Mercedes Uscola. Uptake of nitrogen forms by diploid and triploid white poplar depends on seasonal carbon use strategy and elevated summer ozone. Journal of Experimental Botany, erab317, https://doi.org/10.1093/jxb/erab317".</p> <p class="15">In the study, we investigated the mechanisms of N forms acquisition in response to developmental phase allowing us to analyze the plasticity in N forms preferences due to internal plant N demands that are modified by growth rates. As a second objective we evaluate the effects of O<sub><span>3</span></sub> enriched atmosphere during summer on the N forms uptake rates, which is a major air pollutant harmful to terrestrial vegetation and to human health. </p> <p class="15">Main results of the experiments are that (1) Both ploidy levels had the physiological capacity to absorb intact glycine, and differed in growth, C and N acquisition patterns and N forms preferences. (2) Diploid, with six times higher RGR in spring than in summer, but similar absolute growth between seasons, showed plasticity on N forms preferences in response to seasons, shifting from no preferences in spring to strong preference on NO<sub><span>3</span></sub><sup><span>-</span></sup> in summer. (3) Triploid, with only two times higher RGR in spring than in summer, but strongly higher absolute growth in summer than in spring, showed no plasticity among N forms in response to season and an overall preference for NO<sub><span>3</span></sub><sup><span>-</span></sup>. (4) In response to O<sub><span>3</span></sub>, both ploidy levels decreased their NO<sub><span>3</span></sub><sup><span>- </span></sup>uptake rates as a consequence of C acquisition reduction. However, while diploid was not able to modify its preferences among N forms, and therefore decreased total N uptake rate, triploid was able to compensate the reduction in NO<sub><span>3</span></sub><sup><span>-</span></sup> uptake by increasing NH<sub><span>4</span></sub><sup><span>+</span></sup> and glycine acquisition, further decreasing the cost of N uptaken metabolism. (5) The different plasticity on N forms preferences across seasons and in response to elevated O<sub><span>3</span></sub> between ploidy levels was attributed to different C and N use strategy among nutrients functions in plants, i.e. mass growth, N uptake and metabolism and nutrient reserve, including repair or detoxication in response to O<sub><span>3</span></sub>. Those strategies are deeply explored in the discussion.</p>
Data from: Growth and nitrogen uptake characteristics reveal outbreak mechanism of the opportunistic macroalga Gracilaria tenuistipitata
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Uptake of nitrogen forms by diploid and triploid white poplar depends on seasonal carbon use strategy and elevated summer ozone
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Figure 3 in Relative uptake of organic and inorganic nitrogen by common weed species
Figure 3. Whole-plant recovery of 15N by each species expressed as a percentage of the total 15N applied. Values are means ± 1 SE (n = 5). Within a nitrogen (N) treatment, bars sharing the same letter are not significantly different (Tukey honest significant difference [HSD] test, α = 0.05). See Table 1 for list of full species names.
Isotopic data from: Coupled shifts in ectomycorrhizal communities and plant uptake of organic nitrogen along a soil gradient: an isotopic perspective
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Data from: Soil biota enhance agricultural sustainability by improving crop yield, nutrient uptake and reducing nitrogen leaching losses
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Data from: Foliar uptake of nitrogen from ant faecal droplets: an overlooked service to ant-plants
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Shoot-to-root mobile CEPD-like 2 integrates shoot nitrogen status to systemically regulate nitrate uptake in Arabidopsis
GEO Series GSE140834. Arabidopsis thaliana. 6 samples. Type: Expression profiling by high throughput sequencing.
Small RNA sequencing of Rice Efficient and Non-Efficient Genotypes to determine uptake of Nitrogen
GEO Series GSE198560. Oryza sativa Indica Group. 8 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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International Brain Laboratory public data
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