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29 results for “nutrient status”
The role of moss as integrators of soil and stream nutrient status in deserts, Greater Phoenix area, Arizona, 2011 to 2013
In deserts, moss may play an important role connecting soil and stream nutrient cycling, where stream nutrients may be taken up by moss growing at the terrestrial-aquatic interface, which may be windblown into the surrounding soil to become an organic matter source in the soil. Despite its importance, very little is known about moss’s role in biogeochemical cycles and how nutrient pulses (e.g., from N deposition in air pollution) will affect their functional significance as an integrator of nutrient cycling in deserts. To understand their functional significance, we sampled moss and soil to determine (1) the plasticity of moss stoichiometry in relation to the nutrient content of the soil nutrient source; and (2) if moss stoichiometry covaries over natural environmental nutrient gradients (e.g. differing native soil content).
SGS-LTER Ecosystem Stress Area - Aboveground Biomass: Interactions between individual plant species and soil nutrient status in shortgrass steppe on the Central Plains Experimental Range in Nunn, Colorado, USA 1991
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. The effect of plant community structure on nutrient cycling is fundamental to our understanding of ecosystem function. We examined the importance of plant species and plant cover (i.e. plant covered microsites vs bare soil) on nutrient cycling in shortgrass steppe of northeastern Colorado. We tested the effects of both plant species and cover on soils in an area of undisturbed shortgrass steppe and an area that had undergone nitrogen and water additions from 1971 to 1974, resulting in significant shifts in plant species composition.
SGS-LTER Ecosystem Stress Area - Belowground Biomass: Interactions between individual plant species and soil nutrient status in shortgrass steppe on the Central Plains Experimental Range in Nunn, Colorado, USA 1991
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. The effect of plant community structure on nutrient cycling is fundamental to our understanding of ecosystem function. We examined the importance of plant species and plant cover (i.e. plant covered microsites vs bare soil) on nutrient cycling in shortgrass steppe of northeastern Colorado. We tested the effects of both plant species and cover on soils in an area of undisturbed shortgrass steppe and an area that had undergone nitrogen and water additions from 1971 to 1974, resulting in significant shifts in plant species composition. Additional information and referenced materials can be found: http://hdl.handle.net/10217/83317.
Data from: Ecosystem nitrogen retention is regulated by plant community trait interactions with nutrient status in an alpine meadow
1.Biotic nitrogen (N) retention is an important ecosystem function in the context of ongoing land use intensification, N deposition and global warming. However, a paucity of experimental evidence limits understanding of how different plant community components influence N retention in terrestrial ecosystems. 2.In this investigation we conducted a 15N labelling experiment to test how plant community properties, including plant species richness/diversity, dominance and functional traits, influence plant N uptake and retention under different nutrient availabilities. A three-year experiment examined the effects of adding N (10 g N m−2 year−1) and phosphorus (P) (5 g P m−2 year−1) to an alpine meadow on the Qinghai-Tibetan Plateau. 3.Results show that 15N retention increased with the addition of N and P; the addition of P produced the largest increase of 15N retention in plant and soil N pools. Changes in soil nutrient conditions also facilitated different plant community controls on ecosystem N retention. Ecosystem 15N retention was influenced by species richness and root biomass in the control plots; whereas the N addition treatment showed an important effect of community-weighted means (CWM) of specific leaf area (SLA), and plots with additional P recorded lower CWM of root nitrogen content (root N) and larger CWM root:shoot ratios (R/S) as important determinants. 4.Synthesis. Ecosystem N retention was influenced by conservative and exploitative plant species and/or their traits under N deficient and abundant conditions, respectively, whereas species richness and community plant biomass were most influential under control conditions. The discovery of an interaction between plant community traits and nutrient biogeochemistry as a mechanism for ecosystem N retention offers a means to predict how vegetation in alpine meadow ecosystems will respond to expected global change.
Competition mode and soil nutrient status shape the role of soil microbes in the diversity–invasibility relationship
<p>Understanding the relationship between plant diversity and invasibility is essential in invasion ecology. Species-rich communities are hypothesized to be more resistant to invasions than species-poor communities. However, while soil microorganisms play a crucial role in regulating this diversity–invasibility relationship, the effects of plant competition mode and soil nutrient status on their role remain unclear. To address this, we conducted a two-stage greenhouse experiment. Soils were first conditioned by growing nine native species separately in them for 1 year, then mixed in various configurations with soils conditioned using one, three, or six species, respectively. Next, we inoculated the mixed soil into sterilized substrate soil and planted the alien species <em>Rhus typhina</em> and native species <em>Ailanthus altissima</em> as test plants. We set up two competition modes (intraspecific and interspecific) and two nutrient levels (fertilization using slow-release fertilizer and non-fertilization). Under intraspecific competition, regardless of fertilization, the biomass of the alien species was higher in soil conditioned by six native species. By contrast, under interspecific competition, the biomass increased without fertilization but remained stable with fertilization in soil conditioned by six native species. Analysis of soil microbes suggests that pathogens and symbiotic fungi in diverse plant communities influenced <em>R. typhina</em> growth, which varied with competition mode and nutrient status. Our findings suggest that the soil microbiome is pivotal in mediating the diversity–invasibility relationship, and this influence varies according to competition mode and nutrient status.</p>
Data from: Ecosystem nitrogen retention is regulated by plant community trait interactions with nutrient status in an alpine meadow
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Competition mode and soil nutrient status shape the role of soil microbes in the diversity–invasibility relationship
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Data from: Tree species with conservative foliar nutrient status and strong phosphorus homeostasis are regionally abundant in subtropical forests
<p><span>Foliar </span><span>nitrogen (N) or phosphorus <em>(P)</em> </span><span>status and their </span><span>stoichiometric homeostasis </span><span>are integral parts of the plant nutrient economy </span><span>that determines the success of plant species</span><span> in environments where N or P limits plant growth. </span><span>Despite growing evidence </span><span>for higher predictability of </span><span>stoichiometric </span><span>homeostasis </span><span>of N</span><span> (</span><em><span>H</span></em><sub><span>N</span></sub><span>) than that of P (</span><em><span>H</span></em><sub><span>P</span></sub><span>) on plant species abundance</span><span> in temperate grasslands</span><span>, no previous studies e</span><span>xplicitly examined how foliar N and P status modulate the relationships between </span><span>stoichiometric </span><span>homeostasis and</span><span> species distribution (regional species abundance)</span><span> of woody plants, especially in P-limited (sub)-tropical ecosystems. W</span><span>e hypothesized that species with a conservative foliar nutrient status but a higher </span><em><span>H</span></em><sub><span>P</span></sub><span> (but not</span><span> <em>H</em><sub>N</sub></span><span>) would be regional abundant in </span><span>P-limited</span><span> forest.</span></p> <p><span>We measured foliar N (LNC) and P (LPC) contents of 54 woody species, community composition and soil N and P </span><span>contents across</span><span> 94 forest plots in Chinese subtropical forests. Then we evaluated the species' levels of N and P </span><span>stoichiometric homeostasis</span><span> and their regional abundance to test our hypotheses.</span></p> <p><span><em><span>H</span></em><sub><span>N</span></sub><span> and <em>H</em><sub>P</sub> significantly increased with decreasing LNC and LPC. Foliar nutrient status positively correlated </span><span>with the minimum values of both soil N and P contents, but only negatively associated with the maximum value </span><span>of soil P content, </span><span>indicating that conservative species can occupy a wider range of soil P- than N-based nutrient niche.</span><span> Meanwhile, species abundance negatively correlated with LNC and LPC, and positively correlated with <em><span>H</span></em><sub><span>N</span></sub><span> and <em>H</em><sub>P</sub></span>. However, the structure equation model analysis showed that species abundance increased with decline of LNC but not yet with increased HN. In contrast, species abundance enhanced with increased <span><em>H</em><sub>P</sub> </span>and decreased LPC via <em><span>H</span></em><sub><span>N</span></sub>, rather than directly with a decline of LPC.</span></span></p> <p><span><strong>Synthesis</strong>.</span><span> This study provides empirical evidence that species with conservative foliar nutrient status are more stable in terms of N and P stoichiometric homeostasis, and foliar N and P economy modulate species abundance distribution in different ways. Our results suggest that maintaining strong stoichiometric homeostasis of leaf P, while maintaining conservative economy of N, is a key physiochemical mechanism for shaping species abundance distribution in P-limited forests.</span></p>
Effects of plant-available soil silicon on seedling growth and foliar nutrient status across tropical tree species
<p>Plant-available silicon (Si) concentrations vary considerably across tropical soils, yet the ecological importance of that variation remains largely unresolved. Increased Si availability can enhance growth and modulate foliar nutrient status in many crop species suggesting similar effects might occur in natural systems. However, how growth, foliar Si, and macronutrient concentrations, as well as their stoichiometry, respond to plant-available Si and how these responses differ across tropical tree species is unknown.</p> <p>We experimentally exposed seedlings of 12 tropical tree species to a gradient of plant-available Si concentrations, representing 85% of the variation found across Central Panama, and assessed responses in aboveground growth and foliar nutrient status. Furthermore, we assessed whether higher plant-available Si increases P availability.</p> <p>Increasing plant-available Si led to increased foliar Si concentrations (by up to 140%). It also led to higher aboveground growth (by up to 220%), and it affected foliar C and N concentrations, and nutrient stoichiometry across species. However, at the species level, only a small subset of two to four species showed significant growth and foliar nutrient responses. At the soil level, plant-available P remained unchanged along the experimental soil Si gradient.</p> <p>Our results showed that Si can improve growth and/or modulate foliar nutrient status in a number of tropical tree species. Furthermore, species' growth and foliar nutrient concentrations might vary differently across tropical forest sites varying in plant-available Si. Additionally, Si-induced responses in foliar nutrient stoichiometry have the potential to affect herbivory and litter decomposition. Taken together, natural variation in plant-available Si might influence plant performance unequally across tropical tree species, and change trophic interactions, with potential implications for ecosystem processes.</p>
Nutrient-Dense Complementary Foods on Catch-up Growth and Nutritional Status of Stunting Children
ClinicalTrials.gov study NCT02532816. IPD Sharing: Not stated. Countries: 1. Publications: 2.
The Effects of a Novel Nutritional Product on Nutrient Status and Digestive Health
ClinicalTrials.gov study NCT06181214. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Effects of plant-available soil silicon on seedling growth and foliar nutrient status across tropical tree species
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Data from: Tree species with conservative foliar nutrient status and strong phosphorus homeostasis are regionally abundant in subtropical forests
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Physiological status is a stronger predictor of nutrient selection than ambient plant nutrient content for a wild herbivore
<p class="MsoCommentText">There is generally a close relationship between a consumer's food and its optimal nutrients. When there is a mismatch, it is hypothesized that mobile herbivores switch between food items to balance nutrients, however, there are limited data for field populations. In this study, we measured ambient plant nutrient content at two time points and contrasted our results with the nutrient ratio selected by wild female and male grasshoppers (<em>Oedaleus senegalensis</em>). Few plants were near <em>O. senegalensis'</em> optimal protein:carbohydrate ratio (P:C), nor were plants complementary. Grasshoppers collected earlier all regulated for a carbohydrate-biased ratio but females ate slightly more protein. We hypothesized that the long migration undertaken by this species may explain its carbohydrate needs. In contrast to most laboratory studies, grasshoppers collected later did not tightly regulate their P:C. These results suggest that field populations are not shifting their P:C to match seasonal plant nutrient shifts and that mobile herbivores rely on post-ingestive mechanisms in the face of environmental variation. Because this is among the first studies to examine the relationship between ambient nutrient landscape and physiological state our data are a key step in bridging knowledge acquired from lab studies to hypotheses regarding the role ecological factors play in foraging strategies.</p>
Physiological status is a stronger predictor of nutrient selection than ambient plant nutrient content for a wild herbivore
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tRNA senses cellular nutrient status and senescence via amino acid acylation
GEO Series GSE157510. Homo sapiens. 6 samples. Type: Non-coding RNA profiling by high throughput sequencing.
Effectiveness NutriDent4Mom to Improve Nutrient Intake, Diet Quality, and Periodontal Health Status of Pregnant Women
ClinicalTrials.gov study NCT07247019. IPD Sharing: NO. Countries: 1. Publications: 0.
Nutritional Status and Nutrient Supply in Hospitalised Surgical Patients
ClinicalTrials.gov study NCT03787537. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Nutrient and Immunity Status in Children Aged 3-5 Years Consuming Their Habitual Diet With or Without Fortified Milk
ClinicalTrials.gov study NCT05440604. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Effectiveness of Multiple Micro-nutrient Fortified Fudge on Nutritional Status of 3-5 Years of Age Children
ClinicalTrials.gov study NCT03450174. IPD Sharing: YES. Countries: 1. Publications: 0.
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Allen Brain Atlas
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OpenNeuro
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